CN105490751A - Remote combined preparation method for any two-photon state based on linear optical element - Google Patents
Remote combined preparation method for any two-photon state based on linear optical element Download PDFInfo
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- CN105490751A CN105490751A CN201510821167.9A CN201510821167A CN105490751A CN 105490751 A CN105490751 A CN 105490751A CN 201510821167 A CN201510821167 A CN 201510821167A CN 105490751 A CN105490751 A CN 105490751A
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- 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
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Abstract
The invention provides a remote combined preparation method for any two-photon state based on a linear optical element. In the method, three participants are involved, and the participants include a first sending party, a second sending party and a receiving party; the first sending party, the second sending party and the receiving party share M five-photon entangled states, wherein the first sending party is used as a preparation side of the five-photon entangled states, the first sending party owns a first photon and a third photon of each five-photon entangled state, the second sending party owns a fourth photon of each five-photon entangled state, and the receiving party owns a second photon and a fifth photon of each five-photon entangled state. According to the method provided by the invention, two sending parties and one receiving party share one five-photon entangled state, consequently, remote combined preparation of any two-photon state can be realized, the communication efficiency is high, and the feasibility is high; moreover, implementation of the scheme may require no use of a maximally entangled channel, thus, the cost of implementation of the scheme is saved greatly, and the technical requirements on implementation of the scheme are lowered.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of long-range combined preparation process of any two-photon state based on linear optical element.
Background technology
As everyone knows, what current communication channel transmitted is digital signal or analog signal.Because channel has other interference by mixing up into during transmission of nonideal frequency response characteristic, noise jamming and signal, compromising and send signal and make the signal mode of reception produce distortion or make the digital signal code element of reception produce mistake.For this type of interference, ensure the correct transmission of channel at present mainly through two kinds of modes: be the Performance and quality improving circuit and transmission equipment on the one hand, as adopted optical fiber; Adopt error control strategies, as cyclic redundancy check method etc. on the other hand.But raising circuit and equipment need the renewal of technology and a large amount of investments, use error check then inevitably to waste the communication resource, slow down communication speed.Therefore, the correct transmission of guarantee information is classic network communication urgent need to solve the problem always.Along with the development of quantum information technology, some network communication methods based on Quantum Properties are proposed successively, as quantum-key distribution (QKD), Quantum Secure Direct Communication (QSDC), quantum secret sharing (QSS) and quantum teleportation (QT) etc.These communication meanss, mainly using microcosmic particle as information carrier, by feat of its more distinctive quantum nature, as coherence, Entanglement etc., are avoided interference when transmitting, are had unconditional fail safe, accuracy.In this context, the transmission problem utilizing quantum information technology to solve information is more and more paid close attention to.
Quantum communications are information carrier with quantum state, are carried in the safety of information on quantum state and ensure by fundamental principles of quantum mechanics such as uncertainty relationships, one of vital task of quantum state preparation and transfer chamber quantum communications.Light quantum state is fast owing to having transmission speed, propagates the features such as distance is far away, has become the desirable information carrier of quantum communications.In recent years, the long-range preparation of light quantum state, especially long-rangely combines preparation, causes the extensive concern of various countries researcher, obtains progress.
In recent years, light quantum state combines the extensive concern that technology of preparing obtains researcher in many ways, and the light quantum state proposed under distinct device combines preparation scheme in many ways.As 2008, propose any single-photon state combined preparation process in many ways based on linear optical element: any single-photon state long-range preparation scheme based on linear optical element sends and only needs any single-photon state | φ >=α
0| 0>+ α
1| 1>, (| α
0|
2+ | α
1|
2=1, α
0, α
1for any plural number) two factor alpha
0, α
1two beam splitter coefficients are set, realize any single-photon state | the long-range preparation of φ >.But increase along with photon numbers, multi-photon state coefficient exponentially increases, much more complicated than any single-photon state long-range preparation situation of the long-range preparation of any multi-photon state, and existing any single-photon state scheme is difficult to promote to multi-photon state.
Summary of the invention
For the variety of problems faced described in background technology, the object of the present invention is to provide a kind of long-range combined preparation process of any two-photon state based on linear optical element, from the operability of reality, by the transmission channel of M five photon entanglement states as quantum information, complete that two senders and recipient participate in, carry out long-rangely combining preparation to any two-photon state.
For achieving the above object, the technical solution adopted in the present invention is: described in a kind of long-range combined preparation process of any two-photon state based on linear optical element, method participant has three, comprises first transmit leg, second transmit leg and a recipient; First transmit leg, the second transmit leg, recipient share M five photon entanglement states, wherein, first transmit leg is as the preparation person of five photon entanglement states, first transmit leg has the first photon and the three-photon of each five photon entanglement states, second transmit leg has the 4th photon of each five photon entanglement states, and recipient has the second photon and the 5th photon of each five photon entanglement states; Suppose that the quantum state that need prepare is | ψ >=α
00| 00>+ α
01| 01>+ α
10| 10>+ α
11| 11>, wherein α
00, α
01, α
10, α
11for any plural number, meet Normalized Relation | α
00|
2+ | α
01|
2+ | α
10|
2+ | α
11|
2=1;
The concrete steps of described method are as follows:
Step 1: the first transmit leg, the second transmit leg, recipient share M five photon entanglement states, namely first the first transmit leg is prepared M five smooth class bunch states, then the first transmit leg retains the first photon and the three-photon of each five photon entanglement states, secondly the 4th photon of each five photon entanglement states is sent to the second transmit leg, the second photon of each five photon entanglement states and the 5th photon are sent to recipient;
Step 2: the first transmit leg and the second transmit leg, according to preparing two-photon state information, arrange polarization beam splitter parameter, and perform measurement to by the photon after polarization beam splitter;
Step 3: recipient is according to the measurement result from the first transmit leg and the second transmit leg, recipient selects the photon in opponent to carry out the local unitary evolution operation corresponding to measurement result, can rebuild and need prepare quantum state, thus complete that any two-photon state is long-range combines preparation.
Further, in step 2, each parameter of setting by: the first transmit leg first photon is passed through slide R (θ in light path
1) to the photon polarization state anglec of rotation
three-photon is by slide R (θ in light path
2) to the photon polarization state anglec of rotation
second transmit leg the 4th photon is by slide R (θ in light path
3) R (θ
2) to the photon polarization state anglec of rotation
Further, measurement result is issued recipient by classical communication channel by the first transmit leg and the second transmit leg.
Further, in step 2, the first transmit leg and the second transmit leg are projective measurements to what performed by the photon after polarization beam splitter.
The present invention has following beneficial effect: the present invention shares five photon entanglement states by two transmit legs and recipient and just can realize any the long-range of two-photon state and combine preparation, communication efficiency is high, feasibility is strong, and the realization of scheme can not need to use and maximumly tangles channel, greatly save the cost of scheme implementation and reduce the technical requirement of embodiment.
Embodiment
Below in conjunction with embodiment, the long-range combined preparation process of any two-photon state that the present invention is based on linear optical element is described further.
The long-range combined preparation process participant of any two-photon state that the present invention is based on linear optical element has three, comprises first transmit leg, second transmit leg and a recipient.
First transmit leg, the second transmit leg, recipient share M five photon entanglement states, wherein, first transmit leg is as the preparation person of five photon entanglement states, first transmit leg has the first photon and the three-photon of each five photon entanglement states, second transmit leg has the 4th photon of each five photon entanglement states, and recipient has the second photon and the 5th photon of each five photon entanglement states; Suppose that the quantum state that need prepare is | ψ >=α
00| 00>+ α
01| 01>+ α
10| 10>+ α
11| 11>, wherein α
00, α
01, α
10, α
11for any plural number, meet Normalized Relation | α
00|
2+ | α
01|
2+ | α
10|
2+ | α
11|
2=1;
The concrete steps of described method are as follows:
Step 1: the first transmit leg, the second transmit leg, recipient share M five photon entanglement states, namely first the first transmit leg is prepared M five photon entanglement states, then the first transmit leg retains the first photon and the three-photon of each five photon entanglement states, secondly the 4th photon of each five photon entanglement states is sent to the second transmit leg, the second photon of each five photon entanglement states and the 5th photon are sent to recipient.
Step 2: the first transmit leg and the second transmit leg, according to preparing two-photon state information, arrange slide parameter after polarization beam splitter, namely the first transmit leg first photon pass through slide R (θ in light path
1) to the photon polarization state anglec of rotation
three-photon is by slide R (θ in light path
2) to the photon polarization state anglec of rotation
second transmit leg the 4th photon is by slide R (θ in light path
3) R (θ
2) to the photon polarization state anglec of rotation
quantum entanglement channel is converted into destination channel, performs projective measurements to by the entangled photons after polarization beam splitter.Compared with general measure, the present embodiment uses projective measurements to have equipment requirement not high, the advantage easily realized.
Step 3: recipient receives the measurement result from the first transmit leg and the second transmit leg by classical communication channel, and according to measurement result, in recipient's hand, particle is collapsed to and measurement result corresponding state, according to one-to-one relationship between measurement result and residual particles state, recipient chooses the local unitary evolution operation corresponding to measurement result, just can rebuild original quantum state on its particle, thus complete that any two-photon state is long-range combines preparation.
In sum, the present invention shares five photon entanglement states by two transmit legs and recipient and just can realize any the long-range of two-photon state and combine preparation, communication efficiency is high, feasibility is strong, and the realization of scheme can not need to use and maximumly tangles channel, greatly save the cost of scheme implementation and reduce the technical requirement of embodiment.
Claims (4)
1. based on the long-range combined preparation process of any two-photon state of linear optical element, it is characterized in that: described method participant has three, comprise first transmit leg, second transmit leg and a recipient;
First transmit leg, the second transmit leg, recipient share M five photon entanglement states, wherein, first transmit leg is as the preparation person of five photon entanglement states, first transmit leg has the first photon and the three-photon of each five photon entanglement states, second transmit leg has the 4th photon of each five photon entanglement states, and recipient has the second photon and the 5th photon of each five photon entanglement states;
Suppose that the quantum state that need prepare is | ψ >=α
00| 00>+ α
01| 01>+ α
10| 10>+ α
11| 11>, wherein α
00, α
01, α
10, α
11for any plural number, meet Normalized Relation | α
00|
2+ | α
01|
2+ | α
10|
2+ | α
11|
2=1;
The concrete steps of described method are as follows:
Step 1: the first transmit leg, the second transmit leg, recipient share M five photon entanglement states, namely first the first transmit leg is prepared M five photon entanglement states, then the first transmit leg retains the first photon and the three-photon of each five photon entanglement states, secondly the 4th photon of each five photon entanglement states is sent to the second transmit leg, the second photon of each five photon entanglement states and the 5th photon are sent to recipient;
Step 2: the first transmit leg and the second transmit leg, according to preparing two-photon state information, arrange polarization beam splitter parameter, and perform measurement to by the photon after polarization beam splitter;
Step 3: recipient is according to the measurement result from the first transmit leg and the second transmit leg, recipient selects the photon in opponent to carry out the local unitary evolution operation corresponding to measurement result, can rebuild and need prepare quantum state, thus complete that any two-photon state is long-range combines preparation.
2., as claimed in claim 1 based on the long-range combined preparation process of any two-photon state of linear optical element, it is characterized in that: in step 2, each parameter of setting by: the first transmit leg first photon is passed through slide R (θ in light path
1) to the photon polarization state anglec of rotation
three-photon is by slide R (θ in light path
2) to the photon polarization state anglec of rotation
second transmit leg the 4th photon is by slide R (θ in light path
3) R (θ
2) to the photon polarization state anglec of rotation
3., as claimed in claim 1 or 2 based on the long-range combined preparation process of any two-photon state of linear optical element, it is characterized in that: measurement result is issued recipient by classical communication channel by the first transmit leg and the second transmit leg.
4. as claimed in claim 1 based on the long-range combined preparation process of any two-photon state of linear optical element, it is characterized in that: in step 2, the first transmit leg and the second transmit leg are projective measurements to what performed by the photon after polarization beam splitter.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004990A (en) * | 2018-10-23 | 2018-12-14 | 广西民族大学 | A kind of two-way controllable long-range preparation system of light quantum state |
| CN109039616A (en) * | 2018-10-23 | 2018-12-18 | 广西民族大学 | A kind of light quantum bidirectional remote preparation method based on light quantum state preparation system |
| CN109067530A (en) * | 2018-10-23 | 2018-12-21 | 广西民族大学 | A kind of light quantum state remote control system |
| CN109714156A (en) * | 2018-11-14 | 2019-05-03 | 广西民族大学 | A kind of long-range joint implementation method of quantum manipulation |
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| CN104702342A (en) * | 2015-02-10 | 2015-06-10 | 华南师范大学 | Multi-degree of freedom mixed entangled W-state photon producing system and method |
| WO2015112217A1 (en) * | 2013-10-31 | 2015-07-30 | President And Fellows Of Harvard College | Direct entangled triplet-photon sources and methods for their design and fabrication |
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Patent Citations (4)
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| US20150036967A1 (en) * | 2013-07-31 | 2015-02-05 | United States Air Force | Periodic Probabilistic Two-Dimensional cluster State Generator with Arbitrary Interconnections |
| WO2015112217A1 (en) * | 2013-10-31 | 2015-07-30 | President And Fellows Of Harvard College | Direct entangled triplet-photon sources and methods for their design and fabrication |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004990A (en) * | 2018-10-23 | 2018-12-14 | 广西民族大学 | A kind of two-way controllable long-range preparation system of light quantum state |
| CN109039616A (en) * | 2018-10-23 | 2018-12-18 | 广西民族大学 | A kind of light quantum bidirectional remote preparation method based on light quantum state preparation system |
| CN109067530A (en) * | 2018-10-23 | 2018-12-21 | 广西民族大学 | A kind of light quantum state remote control system |
| CN109067530B (en) * | 2018-10-23 | 2023-07-11 | 广西民族大学 | Light quantum state remote control system |
| CN109714156A (en) * | 2018-11-14 | 2019-05-03 | 广西民族大学 | A kind of long-range joint implementation method of quantum manipulation |
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| CN105490751B (en) | 2017-11-17 |
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