CN112787729B - Method and device for constructing quantum network and quantum network - Google Patents
Method and device for constructing quantum network and quantum network Download PDFInfo
- Publication number
- CN112787729B CN112787729B CN202110016452.9A CN202110016452A CN112787729B CN 112787729 B CN112787729 B CN 112787729B CN 202110016452 A CN202110016452 A CN 202110016452A CN 112787729 B CN112787729 B CN 112787729B
- Authority
- CN
- China
- Prior art keywords
- quantum
- atoms
- energy level
- long
- auxiliary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000010365 information processing Effects 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 9
- 150000002500 ions Chemical class 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 8
- 238000011161 development Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 20
- 239000002096 quantum dot Substances 0.000 description 16
- 238000012546 transfer Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 230000005284 excitation Effects 0.000 description 5
- 230000001427 coherent effect Effects 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000005610 quantum mechanics Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Communication System (AREA)
Abstract
The embodiment of the invention discloses a method, a device and a quantum network for constructing the quantum network, wherein for atoms comprising more than two long-life energy levels, the two long-life energy levels are respectively determined as an operation energy level and an auxiliary energy level; constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level; wherein the long life energy level comprises: energy levels having energy lifetimes greater than a first predetermined multiple of quantum operating durations, each long-lived energy level comprising more than two sub-energy levels for encoding quantum information. According to the embodiment of the invention, the quantum network is constructed by the same atom with different long-life energy levels, so that the crosstalk in the process of realizing entanglement of atoms and photons is avoided, and technical support is provided for application development of quantum computation and quantum network.
Description
Technical Field
The present disclosure relates to, but not limited to, quantum information technology, and more particularly, to a method and apparatus for constructing a quantum network, and a quantum network.
Background
Quantum networks are important elements in the field of quantum information. The quantum information is the cross application of quantum mechanics and information theory, and the quantum entanglement principle is utilized to realize the safe communication lacking in the current classical information field and the quantum computation exceeding the classical computation capability. Quantum networks are mainly divided into two categories: one is quantum communication networks, and the main goal is to achieve secure communication. The other is a quantum computing network, which is one of the main approaches for quantum computing platform expansion, and quantum computing has super-strong computing power on some specific problems, and is therefore concerned with. The current quantum computing platform faces the bottleneck of insufficient expandability. And a quantum network is built, so that the discrete quantum computing nodes are connected with each other, the computing capacity of the system can be greatly expanded, and large-scale quantum computing is realized.
Fig. 1 is a network structure diagram of a quantum network in the related art, as shown in fig. 1, including: quantum nodes and quantum channels; the quantum nodes comprise a plurality of atoms used as logic quantum bits and are responsible for storing and calculating information, the physical platform requires that the logic quantum bits in the quantum nodes have long coherence time, such as trapped ions, a superconducting circuit, a diamond nitrogen hole system and the like, and meanwhile, the quantum nodes also comprise a plurality of atoms used as auxiliary quantum bits and are responsible for constructing connection among the quantum nodes; quantum channels are responsible for information transfer, generally require information carriers with fast propagation speed and low environmental interference, and usually use photons as information carriers. In order to build a quantum network, the connection between quantum nodes is indispensable; the connection between quantum nodes is essentially to construct an entangled state between the auxiliary qubits contained in the two quantum nodes. Fig. 2 is a schematic diagram of establishing quantum node connection in the related art, and as shown in fig. 2, in order to entangle an atom a (auxiliary qubit) in a quantum node 1 with an atom B (auxiliary qubit) in a quantum node 2, entanglement of the atom a with a photon 1 and entanglement of the atom B with a photon 2 are first established, then joint measurement is performed on the photon 1 and the photon 2 (for example, the photon 1 and the photon 2 are interfered on a non-polarizing beam splitter), and whether the entangled state of the atom a and the atom B is successfully established can be determined according to a set measurement result. The probability of successful construction of the entangled state is less than 1, so that the construction needs to be repeated continuously until the entangled state is successfully constructed according to the measurement result. The entanglement between atoms and photons in the construction of quantum nodes is a necessary step for building a quantum network, and different entanglement schemes between atoms and photons are realized for different physical platforms. FIGS. 3 and 4 are schematic diagrams of atomic and photon entanglement achieved in the related art; in two schemes for achieving atom-photon entanglement in the illustrated monatomic (charged or neutral) system, the atoms are excited to an upper energy level | e with a laser>Thereafter the atoms spontaneously radiate back down to the lower energy level with the release of photons; atoms falling back to different energy levelsThe photons released at the time of up have different states; the photon frequencies are different in fig. 3, and the photon polarizations are different in fig. 4, so that the entanglement between atoms and photons is realized; the entangled state of atoms and photons in fig. 3 can be represented as | ×>|ν↑>+|↓>|v↓>; wherein | ↓ > and | ↓ > represent atomic states, | ν↑> and | v↓The > represents photon states of different frequencies; the released photons are collected as flight photons, and quantum channel construction can be realized. Because the entanglement of atoms and photons needs to be repeated continuously, the process of quantum node connection needs to carry out repeated near-resonance excitation on auxiliary quantum bits and is accompanied with the release of a large number of resonance photons. If the logical qubit is identical to the ancillary qubit, this process can cause uncorrectable crosstalk errors on the logical qubit, resulting in information loss: that is, the laser used to excite the ancillary qubit, or the photon released by the ancillary qubit, is absorbed by the logical qubit, the logical qubit is excited to an upper energy level, and then incoherent spontaneous radiation occurs, which can result in the loss of information contained in the logical qubit.
To avoid crosstalk errors, there are two main approaches in the related art: 1. using different atomic species or isotopes as logical qubits and auxiliary qubits; at this time, the logic qubit and the auxiliary qubit have different energy level structures, and thus the excitation and radiation frequencies are greatly different so as not to affect each other. The method greatly increases the complexity of a quantum computing system, reduces the fidelity of a quantum logic gate between the auxiliary quantum bit and the logic quantum bit, and has the problem that the position of the auxiliary quantum bit is uncontrollable randomly. 2. The qubits are spatially shifted, increasing the spatial distance between the auxiliary qubits and the logical qubits, thereby reducing the mutual influence between the auxiliary qubits and the logical qubits. This approach may cause heating of the qubit during movement, thereby degrading system performance or requiring the introduction of additional cooling mechanisms.
In summary, crosstalk errors should be strictly avoided in the process of implementing entanglement between atoms and photons, and methods for avoiding crosstalk errors in the related art are not beneficial to implementation of large-scale quantum computation and quantum networks.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the invention provides a method and a device for constructing a quantum network and the quantum network, which can avoid crosstalk in the process of realizing entanglement of atoms and photons.
The embodiment of the invention provides a method for constructing a quantum network, which comprises the following steps:
determining two long-life energy levels of atoms including more than two long-life energy levels as an operation energy level and an auxiliary energy level respectively;
constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level;
wherein the long life energy level comprises: energy levels having energy lifetimes greater than a first predetermined multiple of quantum operating durations, each of the long lifetime energy levels comprising more than two sub-energy levels for encoding quantum information.
In one illustrative example, prior to determining the two long life energy levels therein as the operating energy level and the auxiliary energy level, respectively, the method further comprises:
the atoms including two or more long-life energy levels are determined based on energy level lifetimes of the atoms.
In one illustrative example, the atoms include:
neutral atoms or charged ions.
In one illustrative example, the constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level comprises:
performing quantum information processing by atoms at the operating energy level;
the connection between the quantum nodes is established by the atoms at the auxiliary energy level.
In one illustrative example, prior to the constructing the quantum network from atoms at the operational energy level and atoms at the auxiliary energy level, the method further comprises:
the atoms used to establish the connection between the quantum nodes are coherently transferred to the auxiliary energy level.
In one illustrative example, the coherently transferring atoms for establishing a connection between quantum nodes to the auxiliary energy level includes:
selecting the atoms for establishing the connection between the quantum nodes through single atom addressing;
coherently transferring the selected atoms for establishing a connection between quantum nodes to the auxiliary energy level.
In one illustrative example, the establishing the connection between the quantum nodes by the atoms at the auxiliary energy level includes:
building an entangled state between the atom and the photon at the auxiliary energy level;
connections between quantum nodes are established by performing a joint measurement of the photons from different quantum nodes.
In one illustrative example, the constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level further comprises:
performing quantum information storage by the atoms at the auxiliary energy level;
a connection between quantum nodes is established through the atoms at the operating energy level.
In one illustrative example, prior to the constructing the quantum network from atoms at the operational energy level and atoms at the auxiliary energy level, the method further comprises:
and selecting atoms for quantum information storage, and coherently transferring the selected atoms for quantum information storage to the auxiliary energy level.
In one illustrative example, the establishing the connection between the quantum nodes by the atoms at the operational energy level comprises:
constructing an entangled state of atoms and photons at an operating energy level;
connections between quantum nodes are established by performing a joint measurement of the photons from different quantum nodes.
In an exemplary instance, the difference in scattering frequencies of the operating energy level and the auxiliary energy level is greater than the inverse of the quantum operating duration by a second preset multiple.
On the other hand, an embodiment of the present invention further provides a terminal, including: a memory and a processor, the memory having a computer program stored therein; wherein the content of the first and second substances,
the processor is configured to execute the computer program in the memory;
the computer program, when executed by the processor, implements a method of constructing a quantum network as described above.
In another aspect, an embodiment of the present invention further provides an apparatus for constructing a quantum network, including: a determining unit and a constructing unit; wherein the content of the first and second substances,
determining two long-life energy levels of atoms including more than two long-life energy levels as an operation energy level and an auxiliary energy level respectively;
constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level;
wherein the long life energy level comprises: energy levels having energy lifetimes greater than a first predetermined multiple of quantum operating durations, each of the long lifetime energy levels comprising more than two sub-energy levels for encoding quantum information.
In another aspect, an embodiment of the present invention further provides a quantum network, including: more than one atom for quantum information processing and more than one atom for establishing connection between quantum nodes; wherein the content of the first and second substances,
the atoms for quantum information processing are at an operating energy level;
the atoms used for establishing the connection between the quantum nodes are at auxiliary energy levels when a quantum network is constructed;
the atom includes two or more long-life energy levels, and the operation energy level and the auxiliary energy level are two of the two or more long-life energy levels of the same atom; the long life energy level includes: energy levels having energy level lifetimes greater than a first predetermined multiple of quantum operating duration, each of the long-lived energy levels comprising more than two sub-energy levels for encoding quantum information; the quantum node includes: one or more atoms for quantum information processing and the one or more atoms for establishing connections between quantum nodes.
In another aspect, an embodiment of the present invention further provides a quantum network, including: more than one atom for quantum information storage and more than one atom for establishing connection between quantum nodes; wherein the content of the first and second substances,
the atoms for quantum information storage are at auxiliary energy levels when a quantum network is constructed;
the atoms used to establish the connections between the quantum nodes are at an operational energy level;
the atom includes two or more long-life energy levels, and the operation energy level and the auxiliary energy level are two of the two or more long-life energy levels of the same atom; the long life energy level includes: energy levels having energy level lifetimes greater than a first predetermined multiple of quantum operating duration, each of the long-lived energy levels comprising more than two sub-energy levels for encoding quantum information; the quantum node includes: one or more atoms for quantum information storage and the one or more atoms for establishing connections between quantum nodes.
The embodiment of the invention determines two long-life energy levels of atoms comprising more than two long-life energy levels as an operation energy level and an auxiliary energy level respectively; constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level; wherein the long life energy level comprises: energy levels having energy lifetimes greater than a first predetermined multiple of quantum operating durations, each of the long lifetime energy levels comprising more than two sub-energy levels for encoding quantum information. According to the embodiment of the invention, the quantum network is constructed by the same atom with different long-life energy levels, so that the crosstalk in the process of realizing entanglement of atoms and photons is avoided, and technical support is provided for application development of quantum computation and quantum network.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a network configuration diagram of a quantum network in the related art;
FIG. 2 is a diagram illustrating the establishment of quantum node connections in the related art;
FIG. 3 is a schematic diagram illustrating atom and photon entanglement in a related art;
FIG. 4 is a schematic diagram of another implementation of atomic and photon entanglement in the related art;
FIG. 5 is a flow chart of a method of constructing a quantum network according to an embodiment of the invention;
FIG. 6 is a schematic illustration of the operational energy levels and auxiliary energy levels of an embodiment of the present invention;
FIG. 7 is a schematic diagram of coherent atomic transfer according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of the construction of atomic and photonic entanglement according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of transferring atoms in different spatial locations according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of another embodiment of the present invention for transferring atoms in different spatial locations;
FIG. 11 is a block diagram of an apparatus for constructing a quantum network according to an embodiment of the present invention;
fig. 12 is a block diagram of the quantum network according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Fig. 5 is a flowchart of a method for constructing a quantum network according to an embodiment of the present invention, as shown in fig. 5, including:
in one illustrative example, atoms in embodiments of the invention include: neutral atoms or charged ions.
In an illustrative example, step 501 of the present invention further includes, before:
atoms comprising more than two long-life energy levels are determined based on their energy level lifetimes.
Wherein the long life energy level comprises: energy levels having energy lifetimes greater than a first predetermined multiple of quantum operating durations, each long-lived energy level comprising more than two sub-energy levels for encoding quantum information.
In one illustrative example, the first preset multiple may include: multiples of more than 1000 times; the first preset multiple can be determined and adjusted by a person skilled in the art according to the application scenario, the implementation difficulty and the like of the quantum network.
The energy level lifetime means: when the ratio of the number of atoms of the high energy level after the spontaneous transition of the time t to the number of atoms at the beginning is equal to 1/e, the time t is defined as the energy level lifetime. The quantum operation duration and energy level lifetime can be determined by relevant theory or existing experimental data.
In one illustrative example, the ground state energy level may be selected as the operating energy level.
In one illustrative example, the difference in scattering frequencies of the two long-life energy levels is greater than the inverse of the quantum operating duration by a second preset multiple; similarly, the difference between the excitation frequencies of the two long-life energy levels is greater than the reciprocal of the quantum operation time length of a second preset multiple; the second preset multiple may be set empirically by a person skilled in the art, for example 1000 times; because of the difference in the scattering and excitation frequencies of the two long-life energy levels, quantum operations on the operating and auxiliary energy levels do not cross-talk with each other; in addition, the atoms of the embodiment of the invention can carry out coherent transfer between the operation energy level and the auxiliary energy level, namely the coherent property can be kept not to be lost in the transfer process.
Since atoms have completely different scattering and excitation frequencies at the auxiliary level and the operating level, photons excited and released by atoms at the auxiliary level have no effect on atoms at the operating level and thus do not cause crosstalk errors.
In one illustrative example, an embodiment of the invention constructs a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level, comprising:
quantum information processing by atoms at an operating energy level;
the connection between the quantum nodes is established by the atoms at the auxiliary energy levels.
In one illustrative example, quantum information processing according to embodiments of the present invention includes: storage and calculation of quantum information, and the like.
In one illustrative example, embodiments of the invention establish a connection between quantum nodes through atoms at an auxiliary energy level, comprising:
building an entangled state between the atom and the photon at the auxiliary energy level;
the connections between quantum nodes are established by performing a joint measurement of photons from different quantum nodes.
In an illustrative example, before constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level, an embodiment method of the invention further comprises:
atoms used for quantum information processing are commonly at the operating energy level by laser pumps.
In an illustrative example, before constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level, an embodiment method of the invention further comprises:
atoms used to establish the connection between the quantum nodes are coherently transferred to the auxiliary energy level.
FIG. 6 is a schematic diagram of atoms at an operational energy level, as shown in FIG. 6, with all atoms at the operational energy level according to an embodiment of the present invention; FIG. 7 is a schematic diagram of the coherent transfer of atoms from the operational energy level to the auxiliary energy level, as shown in FIG. 7, according to an embodiment of the present invention; FIG. 8 is a schematic diagram of the construction of atomic and photon entanglement according to an embodiment of the invention.
In one illustrative example, embodiments of the invention coherently transfer atoms used to establish connections between quantum nodes to an auxiliary energy level, comprising:
selecting atoms for establishing connection between quantum nodes through single atom addressing;
the selected atoms for establishing the connection between the quantum nodes are coherently transferred to an auxiliary energy level.
In one illustrative example, constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level according to embodiments of the present invention further comprises:
quantum information storage is performed through atoms at the auxiliary energy level;
the connections between the quantum nodes are established by atoms at the operating energy level.
In an illustrative example, before constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level, an embodiment method of the invention further comprises:
and selecting atoms for quantum information storage, and coherently transferring the selected atoms for quantum information storage to an auxiliary energy level.
In one illustrative example, embodiments of the invention establish connections between quantum nodes through atoms at an operating energy level, comprising:
constructing an entangled state of atoms and photons at an operating energy level;
the connections between quantum nodes are established by performing a joint measurement of photons from different quantum nodes.
The embodiment of the invention realizes the selection of the atoms of the auxiliary energy level by a single atom addressing method. The monatomic addressing system has monatomic spatial resolution, i.e., the transfer laser can transfer only one atom without affecting other atoms. By using single-atom addressing, atoms at any spatial position in quantum nodes can be selectively transferred in the embodiment of the present invention, and fig. 9 and fig. 10 are schematic diagrams of atoms at different spatial positions transferred in the embodiment of the present invention.
The embodiment of the invention determines two long-life energy levels of atoms comprising more than two long-life energy levels as an operation energy level and an auxiliary energy level respectively; constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level; wherein the long life energy level comprises: energy levels having energy lifetimes greater than a first predetermined multiple of quantum operating durations, each long-lived energy level comprising more than two sub-energy levels for encoding quantum information. According to the embodiment of the invention, the quantum network is constructed by the same atom with different long-life energy levels, so that the crosstalk in the process of realizing entanglement of atoms and photons is avoided, and technical support is provided for application development of quantum computation and quantum network.
An embodiment of the present invention further provides a terminal, including: a memory and a processor, the memory having stored therein a computer program; wherein the content of the first and second substances,
the processor is configured to execute the computer program in the memory;
the computer program, when executed by a processor, implements a method of constructing a quantum network as described above.
Fig. 11 is a block diagram of a device for constructing a quantum network according to an embodiment of the present invention, as shown in fig. 11, including: a determining unit and a constructing unit; wherein the content of the first and second substances,
the determination unit is configured to: determining two long-life energy levels of atoms including more than two long-life energy levels as an operation energy level and an auxiliary energy level respectively;
the construction unit is set as follows: constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level;
wherein the long life energy level comprises: energy levels having energy lifetimes greater than a first predetermined multiple of quantum operating durations, each long-lived energy level comprising more than two sub-energy levels for encoding quantum information.
In one illustrative example, atoms in embodiments of the invention include: neutral atoms or charged ions.
In an exemplary embodiment, the building unit of the embodiment of the present invention is configured to:
quantum information processing by atoms at an operating energy level;
the connection between the quantum nodes is established by the atoms at the auxiliary energy levels.
In an illustrative example, a building block of an embodiment of the invention is configured to establish a connection between quantum nodes through atoms at auxiliary energy levels, including:
building an entangled state between the atom and the photon at the auxiliary energy level;
the connections between quantum nodes are established by performing a joint measurement of photons from different quantum nodes.
In an exemplary embodiment, the determining unit of the embodiment of the present invention is further configured to:
atoms comprising more than two long-life energy levels are determined based on their energy level lifetimes.
In an exemplary embodiment, the difference between the scattering frequencies of the operating energy level and the auxiliary energy level in the embodiment of the present invention is greater than the inverse of the quantum operating duration of the second preset multiple.
In an exemplary embodiment, the apparatus of the present invention further includes an operation unit configured to:
atoms used to establish the connection between the quantum nodes are coherently transferred to the auxiliary energy level.
In one illustrative example, an embodiment of the invention provides an operation unit configured to coherently transfer atoms used to establish a connection between quantum nodes to an auxiliary energy level, comprising:
selecting atoms for establishing connection between quantum nodes through single atom addressing;
the selected atoms for establishing the connection between the quantum nodes are coherently transferred to an auxiliary energy level.
Fig. 12 is a block diagram of a quantum network according to an embodiment of the present invention, and as shown in fig. 12, the quantum network includes: more than one atom for quantum information processing and more than one atom for establishing connection between quantum nodes; wherein the content of the first and second substances,
the atoms used for quantum information processing are at an operating energy level;
atoms used for establishing connection between quantum nodes are at auxiliary energy levels when a quantum network is constructed;
the atom includes two or more long-life energy levels, and the operation energy level and the auxiliary energy level are two of the two or more long-life energy levels of the same atom; the long life energy levels include: energy levels with energy level lifetimes greater than a first predetermined multiple of quantum operating duration, each long-life energy level comprising more than two sub-energy levels for encoding quantum information; the quantum node includes: more than one atom for quantum information processing and more than one atom for establishing a connection between quantum nodes.
The embodiment of the present invention further provides a quantum network, including: more than one atom for quantum information storage and more than one atom for establishing connection between quantum nodes; wherein the content of the first and second substances,
the atoms used for quantum information storage are at auxiliary energy levels when a quantum network is constructed;
the atoms used to establish the connection between the quantum nodes are at an operating energy level;
the atom includes two or more long-life energy levels, and the operation energy level and the auxiliary energy level are two of the two or more long-life energy levels of the same atom; the long life energy levels include: energy levels with energy level lifetimes greater than a first predetermined multiple of quantum operating duration, each long-life energy level comprising more than two sub-energy levels for encoding quantum information; the quantum node includes: more than one atom for quantum information storage and more than one atom for establishing a connection between quantum nodes.
"one of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media "as is well known to those of ordinary skill in the art.
Claims (15)
1. A method of constructing a quantum network, comprising:
determining two long-life energy levels of atoms including more than two long-life energy levels as an operation energy level and an auxiliary energy level respectively;
constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level, the atoms at the operational energy level and the atoms at the auxiliary energy level being the same kind of atoms;
wherein the long life energy level comprises: an energy level having an energy level lifetime greater than a first preset multiple of the quantum operating duration; each of the long life energy levels comprises more than two sub-energy levels for encoding quantum information.
2. The method of claim 1, wherein prior to determining the two long life energy levels as the operating energy level and the auxiliary energy level, respectively, the method further comprises:
the atoms including two or more long-life energy levels are determined based on energy level lifetimes of the atoms.
3. The method of claim 1, wherein the atoms comprise:
neutral atoms or charged ions.
4. A method according to claim 1, 2 or 3, wherein the constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level comprises:
performing quantum information processing by atoms at the operating energy level;
the connection between the quantum nodes is established by the atoms at the auxiliary energy level.
5. The method of claim 4, wherein prior to constructing the quantum network from atoms at the operational energy level and atoms at the auxiliary energy level, the method further comprises:
the atoms used to establish the connection between the quantum nodes are coherently transferred to the auxiliary energy level.
6. The method of claim 5, wherein the coherently transferring atoms used to establish the connection between quantum nodes to the auxiliary energy level comprises:
selecting the atoms for establishing the connection between the quantum nodes through single atom addressing;
coherently transferring the selected atoms for establishing a connection between quantum nodes to the auxiliary energy level.
7. The method of claim 4, wherein establishing the connection between the quantum nodes through the atoms at the auxiliary energy level comprises:
building an entangled state between the atom and the photon at the auxiliary energy level;
connections between quantum nodes are established by performing a joint measurement of the photons from different quantum nodes.
8. The method of claim 1, 2 or 3, wherein constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level further comprises:
performing quantum information storage by the atoms at the auxiliary energy level;
a connection between quantum nodes is established through the atoms at the operating energy level.
9. The method of claim 8, wherein prior to constructing the quantum network from atoms at the operational energy level and atoms at the auxiliary energy level, the method further comprises:
and selecting atoms for quantum information storage, and coherently transferring the selected atoms for quantum information storage to the auxiliary energy level.
10. The method of claim 8, wherein establishing connections between quantum nodes through the atoms at the operational energy level comprises:
constructing an entangled state of atoms and photons at an operating energy level;
connections between quantum nodes are established by performing a joint measurement of the photons from different quantum nodes.
11. A method as claimed in claim 1, 2 or 3, wherein the difference in scattering frequency between the operating energy level and the auxiliary energy level is greater than the inverse of the quantum operating duration by a second predetermined multiple.
12. A terminal, comprising: a memory and a processor, the memory having a computer program stored therein; wherein the content of the first and second substances,
the processor is configured to execute the computer program in the memory;
the computer program when executed by the processor implements a method of constructing a quantum network as claimed in any one of claims 1 to 11.
13. An apparatus for constructing a quantum network, comprising: a determining unit and a constructing unit; wherein the content of the first and second substances,
determining two long-life energy levels of atoms including more than two long-life energy levels as an operation energy level and an auxiliary energy level respectively;
constructing a quantum network from atoms at an operational energy level and atoms at an auxiliary energy level;
wherein the long life energy level comprises: energy levels having energy lifetimes greater than a first predetermined multiple of quantum operating durations, each of the long lifetime energy levels comprising more than two sub-energy levels for encoding quantum information.
14. A quantum network, comprising: more than one atom for quantum information processing and more than one atom for establishing connection between quantum nodes; wherein the content of the first and second substances,
the atoms for quantum information processing are at an operating energy level;
the atoms used for establishing the connection between the quantum nodes are at auxiliary energy levels when a quantum network is constructed;
the atom includes two or more long-life energy levels, and the operation energy level and the auxiliary energy level are two of the two or more long-life energy levels of the same atom; the long life energy level includes: energy levels having energy level lifetimes greater than a first predetermined multiple of quantum operating duration, each of the long-lived energy levels comprising more than two sub-energy levels for encoding quantum information; the quantum node includes: one or more atoms for quantum information processing and the one or more atoms for establishing connections between quantum nodes.
15. A quantum network, comprising: more than one atom for quantum information storage and more than one atom for establishing connection between quantum nodes; wherein the content of the first and second substances,
the atoms for quantum information storage are at auxiliary energy levels when a quantum network is constructed;
the atoms used to establish the connections between the quantum nodes are at an operational energy level;
the atom includes two or more long-life energy levels, and the operation energy level and the auxiliary energy level are two of the two or more long-life energy levels of the same atom; the long life energy level includes: energy levels having energy level lifetimes greater than a first predetermined multiple of quantum operating duration, each of the long-lived energy levels comprising more than two sub-energy levels for encoding quantum information; the quantum node includes: one or more atoms for quantum information storage and the one or more atoms for establishing connections between quantum nodes.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110016452.9A CN112787729B (en) | 2021-01-07 | 2021-01-07 | Method and device for constructing quantum network and quantum network |
| US17/450,565 US20220129778A1 (en) | 2020-10-22 | 2021-10-12 | Dual-type Qubits System, Quantum Network and Construction Method Thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110016452.9A CN112787729B (en) | 2021-01-07 | 2021-01-07 | Method and device for constructing quantum network and quantum network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112787729A CN112787729A (en) | 2021-05-11 |
| CN112787729B true CN112787729B (en) | 2022-03-25 |
Family
ID=75756635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110016452.9A Active CN112787729B (en) | 2020-10-22 | 2021-01-07 | Method and device for constructing quantum network and quantum network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112787729B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113283606B (en) * | 2021-06-11 | 2022-09-23 | 清华大学 | Method and device for constructing quantum logic gate, computer storage medium and terminal |
| CN113592091B (en) * | 2021-07-14 | 2024-04-12 | 清华大学 | Method and device for constructing entangled state, and method and device for realizing node connection |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2365502A1 (en) * | 1973-05-25 | 1975-05-15 | Standard Elektrik Lorenz Ag | Semiconductor storage device for multistable voltage steps - accelerates carriers taking electrons to higher energy levels |
| US4592064A (en) * | 1983-09-30 | 1986-05-27 | At&T Bell Laboratories | Inner-shell d-electron photoionization apparatus |
| CN102593694A (en) * | 2012-02-15 | 2012-07-18 | 北京大学 | Active laser frequency standard based on four-energy-level quantum system |
| CN105553569A (en) * | 2015-12-28 | 2016-05-04 | 上海电机学院 | Method for converting path entangled state from atom system to photon system |
| CN111919227A (en) * | 2017-11-07 | 2020-11-10 | 马里兰大学帕克分校 | Quantum networking node and protocol with multiple qubit species |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080258049A1 (en) * | 2007-04-18 | 2008-10-23 | Kuzmich Alexander M | Quantum repeater using atomic cascade transitions |
| US8014430B2 (en) * | 2008-02-27 | 2011-09-06 | President And Fellows Of Harvard College | Quantum cascade laser |
| CN107272299B (en) * | 2017-07-28 | 2019-09-24 | 山西大学 | The generation device of continuous variable quantum entanglement between multiple atom assemblages |
| CN108923258B (en) * | 2018-07-12 | 2020-11-03 | 华南师范大学 | Design method of trap type double-phonon active region energy level structure in terahertz quantum cascade laser |
| CN109379144B (en) * | 2018-11-27 | 2020-10-09 | 北京航空航天大学 | Quantum network coding method based on quantum detuning |
| CN109982410B (en) * | 2019-04-18 | 2020-04-07 | 成都信息工程大学 | Quantum wireless mesh network routing method and framework based on entanglement exchange |
-
2021
- 2021-01-07 CN CN202110016452.9A patent/CN112787729B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2365502A1 (en) * | 1973-05-25 | 1975-05-15 | Standard Elektrik Lorenz Ag | Semiconductor storage device for multistable voltage steps - accelerates carriers taking electrons to higher energy levels |
| US4592064A (en) * | 1983-09-30 | 1986-05-27 | At&T Bell Laboratories | Inner-shell d-electron photoionization apparatus |
| CN102593694A (en) * | 2012-02-15 | 2012-07-18 | 北京大学 | Active laser frequency standard based on four-energy-level quantum system |
| CN105553569A (en) * | 2015-12-28 | 2016-05-04 | 上海电机学院 | Method for converting path entangled state from atom system to photon system |
| CN111919227A (en) * | 2017-11-07 | 2020-11-10 | 马里兰大学帕克分校 | Quantum networking node and protocol with multiple qubit species |
Non-Patent Citations (5)
| Title |
|---|
| Intrinsic retrieval efficiency for quantum memories: A three-dimensional theory of light interaction with an atomic ensemble;Tanvi P.Gujarati et al;《PHYSICAL REVIEW A》;20180316;全文 * |
| Observation of entanglement between a single trapped atom and a single photon;D.L.Moehring et al;《InternationalQuantum Electronics Conference, 2004. (IQEC)》;20040521;全文 * |
| 光通信波段多频道量子通道的实验研究;周强等人;《中国基础科学》;20190215;第21卷(第1期);全文 * |
| 用一个纠缠态实现多粒子纠缠态的量子隐形传送;唐有良等人;《物理学报》;20081215;第57卷(第12期);全文 * |
| 高维量子逻辑门及高维量子信息处理;徐文玲等人;《科学通报》;20190513;第64卷(第16期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112787729A (en) | 2021-05-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112787729B (en) | Method and device for constructing quantum network and quantum network | |
| CA3004750C (en) | Techniques for quantum error correction using bosonic modes and related systems and methods | |
| Nunn et al. | Enhancing multiphoton rates with quantum memories | |
| Barrett et al. | Efficient high-fidelity quantum computation using matter qubits and linear optics | |
| Simon et al. | Quantum repeaters with photon pair sources and multimode memories | |
| Chen et al. | Fault-tolerant quantum repeater with atomic ensembles and linear optics | |
| US10217057B2 (en) | Removing leakage in a quantum bit | |
| TWI227394B (en) | Error correction coding apparatus and method | |
| CN112884155A (en) | Method and device for realizing quantum logic gate | |
| US20230119786A1 (en) | Method and apparatus for realizing quantum operation | |
| Kurokawa et al. | Remote entanglement of superconducting qubits via solid-state spin quantum memories | |
| Dhara et al. | Subexponential rate versus distance with time-multiplexed quantum repeaters | |
| Bardyn et al. | Exponential lifetime improvement in topological quantum memories | |
| Takata et al. | Data search by a coherent Ising machine based on an injection-locked laser network with gradual pumping or coupling | |
| CN113592091B (en) | Method and device for constructing entangled state, and method and device for realizing node connection | |
| CN113592092B (en) | Method for realizing momentum recoil, method and device for constructing quantum logic gate | |
| Zhang et al. | A new design of cache-aided multiuser private information retrieval with uncoded prefetching | |
| CN113283606B (en) | Method and device for constructing quantum logic gate, computer storage medium and terminal | |
| CN112836826B (en) | Method and device for realizing quantum logic gate | |
| Dada et al. | Quantum measurements of atoms using cavity QED | |
| US20220129778A1 (en) | Dual-type Qubits System, Quantum Network and Construction Method Thereof | |
| Wampler et al. | Fragmentation and prethermal dynamical phases in disordered strongly interacting Floquet systems | |
| Meng et al. | Quantum Networks Enhanced by Distributed Quantum Memories | |
| KR102289632B1 (en) | A quantum communication method by using a plurality of coherent state and an electronic device for the quantum communication method | |
| Kollas et al. | Faithful extraction of quantum coherence |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |