CN107195324A - A kind of high efficiency quantum storing device of continuous variable non-classical optical state - Google Patents
A kind of high efficiency quantum storing device of continuous variable non-classical optical state Download PDFInfo
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- CN107195324A CN107195324A CN201710626022.2A CN201710626022A CN107195324A CN 107195324 A CN107195324 A CN 107195324A CN 201710626022 A CN201710626022 A CN 201710626022A CN 107195324 A CN107195324 A CN 107195324A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N10/00—Quantum computing, i.e. information processing based on quantum-mechanical phenomena
Abstract
The present invention relates to a kind of high efficiency quantum storing device of continuous variable non-classical optical state.The present invention mainly solves the low technical problem of existing non-classical optical state quantum storage efficiency.The technical scheme is that：A kind of high efficiency quantum storing device of continuous variable non-classical optical state, including light source cell, atomic system and compression measuring system；The light source cell is provided with local oscillations optical signal aLOutput end, probe optical pulse signal aPOutput end and control light pulse signal aCOutput end；The probe optical pulse signal aPThe first input end connection of output end and atomic system, the control light pulse signal aCThe second input connection of output end and atomic system, the output end of atomic system is connected with compressing the first input end of measuring system, local oscillations optical signal aLOutput end is connected with compressing the second input of measuring system；The compression measuring system by optical beam-splitter, two balanced homodyne detection devices, power subtracter and numeral can storage oscillograph constitute.
Description
Technical field
The present invention relates to a kind of high efficiency quantum storing device of continuous variable non-classical optical state.It belongs to a kind of by continuously
The quantum state storage of variable compression state light field is measured into the spin wave quantum state of atom assemblage, and by optical resonator raising
The equipment of sub- storage efficiency.
Background technology
With the development of quantum information science, the quantum information network being made up of quantum optics passage and atom quantum nodes
It is the guarantee of practical application.Wherein, the just ideal carrier of quantum information long-distance transmissions；Atom assemblage is due to thick with optics
The big advantage for going with coherence of degree, is to realize one of Effective medium of quantum nodes, it is possible to achieve the storage of quantum information and place
Reason.Therefore, the quantum state of light is stored in atom assemblage, is the important foundation for realizing quantum information network.
Non-classical optical state is the core resource for realizing quantum information.Wherein, squeezed light is a kind of important non-classical optical state,
And it can be coupled into by optical beam-splitter and tangle light.At present, the transparent mechanism of electromagnetically induced is to realize one kind of quantum storage
Effective ways, can realize the mutual mapping between the quantum state of light and the spin state of atom.Electricity particularly in atom assemblage
Magnetic guidance clearing process has the advantages that noise is small, therefore this method is applied to the quantum storage of non-classical optical state.Meanwhile, Gao Bao
True quantum information processing needs efficient quantum storage.Therefore, the quantum state of squeezed light is expeditiously stored into atom system
Comprehensive spin state, is the key of the practical development of quantum information network.
2012, Japanese Kozuma seminar realized compression using the transparent mechanism of electromagnetically induced in cold atom assemblage
The quantum storage of light, in Phys.Rev.Lett.100, entitled " Storage and Retrieval are delivered in 093601 (2008)
Of a Squeezed Vacuum " paper.The same year, Canadian Lvovsky seminar also achieves in pyrogen subensemble
The quantum storage of squeezed light, in Phys.Rev.Lett.100, entitled " Quantum Memory for are delivered in 093602 (2008)
Squeezed Light " paper.
Two above research work realize squeezed light atom assemblage quantum store, solve non-classical optical state
The problem of quantum is stored is realized in atom assemblage, but the quantum storage efficiency of the above method is most in 10-20% or so, and they are deposited
In the low technical problem of quantum storage efficiency.
The content of the invention
Present invention aim to address the low technical problem of existing non-classical optical state quantum storage efficiency, there is provided a kind of reliable
Property the good and high continuous variable non-classical optical state of storage efficiency high efficiency quantum storing device.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of height of continuous variable non-classical optical state
Efficiency quantum storing device, including light source cell, atomic system and compression measuring system；The light source cell is provided with local oscillations
Optical signal aLOutput end, probe optical pulse signal aPOutput end and control light pulse signal aCOutput end；The spy of the horizontal polarization
Pin light pulse signal aPThe first input end connection of output end and atomic system, the control light pulse signal a polarized verticallyC
The second input connection of output end and atomic system, the first input end of the output end and compression measuring system of atomic system connects
Connect, local oscillations optical signal aLOutput end is connected with compressing the second input of measuring system；The compression measuring system is by light
Learning beam splitter, two balanced homodyne detection devices, power subtracter and numeral can storage oscillograph composition.
The light source cell is by tunable laser, the optical beam-splitter arrays of 1x 3, optical parametric amplifier, four sets of acousto-optics
Modulating system is constituted.The output end of the tunable laser is connected with the input of 1x3 optical beam-splitter arrays, 1x3 optics
The first output end output local oscillations optical signal a of beam splitter arrayL, the second output end of 1x3 optical beam-splitter arrays and
The input connection of one acousto-optic modulation system, the output end of the first acousto-optic modulation system and the input of optical parametric amplifier connect
Connect, the output end of optical parametric amplifier is connected with the input of the 3rd acousto-optic modulation system, the output of the 3rd acousto-optic modulation system
Probe optical pulse signal aP, the 3rd output end of 1x3 optical beam-splitter arrays is connected with the input of rising tone light modulation system,
The output end of rising tone light modulation system is connected with the input of falling tone light modulation system, the output control of falling tone light modulation system
Light pulse signal a processedC；The tunable laser uses low noise, narrow linewidth, ti sapphire laser；The optical parameter is put
Big device produces the compressed state optical field with Atomic absorption lines matching；Described first, the 3rd, falling tone light modulation system is by a pair of acousto-optics
Modulator is constituted；The rising tone light modulation system is made up of two double secondary acousto-optic modulators passed through.
The atomic system is made up of atomic components and optical resonator, and the optical resonator is by the flat hysteroscope of two panels, two
The concavees lens composition that the plano-concave hysteroscope and a piece of focal length that plate curvature radius is 1000mm are 30mm；The optical resonator uses four
Mirror ring cavity structure, a length of 1456mm of its chamber；First flat hysteroscope is as input and output coupling mirror, and the transmitance to probe light is
20%；Second flat hysteroscope is high to probe light anti-；Two panels plano-concave hysteroscope is high to probe light anti-, and a piece of plano-concave hysteroscope is fixed
On piezoelectric ceramics；The atomic components are located in the middle of two plano-concave hysteroscopes of optical resonator.
The present invention uses above-mentioned technical proposal, and orthogonal point of light field in electromagnetically induced clearing process is strengthened using optical resonator
The interaction of amount and atom assemblage collective spin wave, and then quantum storage efficiency is improved, to realize the efficient of non-classical optical state
Rate quantum is stored.The transparent mechanism of electromagnetically induced is using the coherence between two ground state levels of atom, in the effect of control light
Under, there is Transparency Phenomenon in probe light, and due to slower rays phenomenon caused by dispersion, this is provided for the realization that quantum is stored can
Energy.Theoretical according to dark-state extremely son, in the presence of light is write, quantum state can be mapped to atom assemblage from light field；Reading the work of light
Under, quantum state can be mapped to light field from atom assemblage.Moreover, the noise very little that electromagnetically induced clearing process is introduced, especially
Suitable for the quantum storage of non-classical optical state.In addition, repeatedly passing through atom in optical resonance intracavitary light field, can effectively it strengthen
The interaction of light and atom, and then improve quantum storage efficiency.The present invention can realize the high efficiency storage of compressed state optical field
And release, the quantum state of compressed state optical field is expeditiously stored in atom assemblage.Compared with background technology, the present invention has
Storage efficiency is high, the advantage of good reliability.The quantum storing device of the present invention has following beneficial effect：
1st, the present invention mutually ties optical resonator technology with based on the transparent atom assemblage quantum memory technology of electromagnetically induced
Close, the high efficiency quantum storage of non-classical optical state can be realized.
2nd, the optical resonator that the present invention is utilized can make probe light repeatedly pass through atom assemblage, interact,
Improve quantum storage efficiency.
3rd, the optical resonance intracavitary that the present invention is utilized places concavees lens, for waist class in enlarged cavity, to increase light and original
The region of son interaction, improves quantum storage efficiency.
The present invention is to be improved the quantum storage efficiency of continuous variable non-classical optical state by optical resonator, is adapted to application
In the processing of quantum information network, particularly high-fidelity quantum information comprising atomic node.
Brief description of the drawings
Fig. 1 the structural representation of present invention；
The structural representation of Fig. 2 light source cells of the present invention；
The energy level schematic diagram of Fig. 3 atom assemblages of the present invention；
The control sequential figure of Fig. 4 optical signals of the present invention；
The structural representation of Fig. 5 atomic systems of the present invention；
The structural representation of Fig. 6 present invention compression measuring systems.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
As shown in figure 1, a kind of high efficiency quantum storing device of continuous variable non-classical optical state in the present embodiment, including
Light source cell 1, atomic system 2 and compression measuring system 3；The light source cell 1 is provided with local oscillations optical signal aLOutput end, spy
Pin light pulse signal aPOutput end and control light pulse signal aCOutput end；The probe optical pulse signal a of the horizontal polarizationPIt is defeated
Go out end to be 1. connected with the first input end of atomic system 2, the control light pulse signal a polarized verticallyCOutput end and atom
2. second input of system 2 connects, and 1. the output end of atomic system 2 is connected with compressing the first input end of measuring system 3, this
Ground oscillating optical signal aL2. output end is connected with compressing the second input of measuring system 3.
As shown in Fig. 2 the light source cell is by tunable laser 11, the optical beam-splitter arrays 12 of 1x 3, optical parameter
Amplifier 13 and four sets of acousto-optic modulation system 14-17 compositions.The output end of the tunable laser 11 and 1x3 optical beam-splitters
1. the input connection of array 12, the first output end of 1x3 optical beam-splitters array 12 exports local oscillations optical signal aL, 1x3
Input of second output end of optical beam-splitter array 12 2. with the first acousto-optic modulation system 14 is connected, the first acousto-optic modulation system
The output end of system 14 is connected with the input of optical parametric amplifier 13, the output end of optical parametric amplifier 13 and the 3rd acousto-optic
The input connection of modulating system 16, the 3rd acousto-optic modulation system 16 output probe optical pulse signal aP, 1x3 optical beam-splitters battle array
Input of 3rd output end of row 12 3. with rising tone light modulation system 15 is connected, the output end of rising tone light modulation system 15
It is connected with the input of falling tone light modulation system 17, the output control light pulse signal a of falling tone light modulation system 17C.It is described
Tunable laser 11 is using low noise, narrow linewidth, ti sapphire laser, and the laser exports 795nm laser, corresponding to rubidium
The Absorption Line of atom.Optical parametric amplifier 13 produces the compressed state optical field with rubidium Atomic absorption lines matching.Firstth, the 3rd acousto-optic
Modulating system 14,16, opens the light for being realized to laser, obtains probe optical pulse signal aP.Secondth, falling tone light modulation system
15th, 17, for realizing frequency displacement to laser and opening the light, obtain control light pulse signal aC.First acousto-optic modulation system 14 is by a pair
100MHz acousto-optic modulators are constituted, for producing the analog optical signal that optical parametric amplifier 13 and atomic system 2 are locked.Second
Acousto-optic modulation system 15 is made up of two double secondary 1.7GHz acousto-optic modulators passed through, the shift frequency for realizing laser 6.8GHz.
3rd, falling tone light modulation system 16,17 is made up of a pair of 100MHz acousto-optic modulators, for the sequential control in storing process
System.
As shown in figure 3, the atomic system 2 is using the 5 of the atom of rubidium 872S1/2F=1 and F=2 and 52P1/2F '=1
Hyperfine energy level.Using the tuning characteristic and the shift frequency characteristic of second sound-optic modulator 15 of ti sapphire laser 11, phase is obtained
Answer the optical signal of wavelength.Control light pulse signal aCFrequency and 52S1/2F=1 to 52P1/2The transition absorption line of F '=1 have
Δ=700MHz single photon off resonance；Probe optical pulse signal aPWith local oscillations optical signal aLFrequency it is identical, the frequency and
52S1/2F=2 to 52P1/2The transition absorption line of F '=1 have Δ=700MHz single photon off resonance and δ=0.5MHz double light
Sub- mismatching angle.
As shown in figure 4, using first, the 3rd, the switching characteristic of falling tone optical modulator 14,16,17, when realizing corresponding
Sequence is controlled.Whole controlling cycle takes 1 millisecond.Local oscillations optical signal aLWithout acousto-optic modulator, in normally open.In light
In 10 microseconds of atomic interaction, using acousto-optic modulator 14 by probe optical pulse signal aPClose, remaining time opens
And strong simulated light is exported, for the locking to optical resonator in optical parametric amplifier and quantum storage；In probe light
In pulse signal and atomic interaction time, using acousto-optic modulator 16 by probe optical pulse signal aPOpened for 500 nanoseconds, use
In quantum storage.While probe optical pulse signal is opened, light pulse signal a will be controlled using acousto-optic modulator 17COpen 1
Microsecond, realizes probe optical pulse signal aPQuantum storage；After the storage time of 1 microsecond, using acousto-optic modulator 17 again
Open control light pulse signal aC, the quantum state of atomic system is read, release light pulse signal a ' is converted toP。
As shown in figure 5, the atomic system 2 is made up of atomic components and optical resonator, wherein, atomic components are by atom
Air chamber 21, magnetic shielding system and temperature control system 24 are constituted, and the magnetic shielding system is made up of magnetic cup wallpaper 22 and magnetic shielding cylinder 23；
The atomic air chamber 21 is coated with accordingly filled with atomic gas and a certain amount of inert buffer gas in the light pass surface of atomic air chamber 21
The antireflective film of optical maser wavelength, the outer layer magnetic screen paper 22 of atomic air chamber 21 is wrapped up, and is positioned over the magnetic shielding cylinder 23 of metal
It is interior, set former to rubidium using the temperature control system 24 of heating tape, insulation material and temperature control instrument composition in the outer layer of magnetic shielding cylinder 23
Son heating and accurate temperature controlling；The optical resonator is by the flat hysteroscope 25 of two panels, 26, the plano-concave that two panels radius of curvature is 1000mm
Hysteroscope 27,28 and a piece of focal length constitute for 30mm concavees lens 29；The optical resonator uses four mirror ring cavity structures, its chamber
A length of 1456mm；First flat hysteroscope 25 is located at probe optical pulse signal a as input and output coupling mirrorPInput path and go out
Penetrate in light path, the transmitance to probe light is 20%；Second flat hysteroscope 26 is located at probe optical pulse signal aPInput path
In to probe optical pulse signal aPIt is high anti-；Two panels plano-concave hysteroscope 27,28 is located at the both sides of atomic system 2 and positioned at probe optical pulse
Signal aPReflected light path on to probe optical pulse signal aPHeight is anti-, and a piece of plano-concave hysteroscope 28 is fixed on piezoelectric ceramics,
For optical resonator chamber length, probe optical pulse signal aPWith control light pulse signal aCThe locking of resonance；Concavees lens 29 are located at
To probe optical pulse signal a in the middle of a piece of flat hysteroscope 25 and second flat hysteroscope 26PIt is high thoroughly to amplify intracavitary hot spot, to increase
The region of light and atomic interaction；The atomic components are located in the middle of two plano-concave hysteroscopes 27,28 of optical resonator.
As shown in fig. 6, the compression measuring system is by optical beam-splitter 31, balanced homodyne detection device 32,33, power subtraction
Device 34 and numeral can storage oscillograph 35 constitute；The probe optical pulse a ' of releasePWith local oscillations optical signal aLThrough optical beam-splitter
31 interference, interference signal can 35 pairs of releases of storage oscillograph by balanced homodyne detection device 32,33, power subtracter 34 and numeral
Probe optical pulse a 'PThe quantum noise of quadrature component measure, store and analyze, and it is interfered using simulated light
Position difference is locked.
Optical parametric amplifier 13 is operated in the anti-magnifying state of parameter, produces a branch of orthogonal amplitude squeezed light；By first,
3rd acousto-optic modulator 14,16 is converted into compression probe optical pulse signal aP；In control light pulse signal aCWrite-in effect
Under, by above-mentioned compression probe optical pulse signal aPStore in atomic system 2；In control light pulse signal aCReading effect under,
The quantum state of above-mentioned atomic system 2 is mapped to release probe optical pulse a 'PIn, and utilize local oscillations optical signal aLAnd pressure
Contracting measuring system 3 discharges light pulse signal to it and measured.
The present invention is not limited to the above embodiments, without departing from the scope of the invention, enters according to the above description
Capable improvement and conversion should all belong to the protection domain of the claims in the present invention.
Claims (3)
1. a kind of high efficiency quantum storing device of continuous variable non-classical optical state, it is characterised in that：Including light source cell, atom
System and compression measuring system；The light source cell is provided with local oscillations optical signal aLOutput end, probe optical pulse signal aPOutput
End and control light pulse signal aCOutput end；The probe optical pulse signal a of the horizontal polarizationPThe of output end and atomic system
One input is connected, the control light pulse signal a polarized verticallyCThe second input connection of output end and atomic system,
The output end of atomic system is connected with compressing the first input end of measuring system, local oscillations optical signal aLOutput end is surveyed with compression
The second input connection of amount system；The compression measuring system is subtracted by optical beam-splitter, two balanced homodyne detection devices, power
Musical instruments used in a Buddhist or Taoist mass and numeral can storage oscillograph compositions.
2. a kind of high efficiency quantum storing device of continuous variable non-classical optical state according to claim 1, its feature exists
In：The light source cell is by tunable laser, 1x3 optical beam-splitters array, optical parametric amplifier and four sets of acousto-optic modulations
System is constituted；The output end of the tunable laser is connected with the input of 1x3 optical beam-splitter arrays, 1x3 optical beam splittings
The first output end output local oscillations optical signal a of device arrayL, the second output end and the first sound of 1x3 optical beam-splitter arrays
The input connection of light modulation system, the output end of the first acousto-optic modulation system and the input of optical parametric amplifier are connected,
The output end of optical parametric amplifier is connected with the input of the 3rd acousto-optic modulation system, the 3rd acousto-optic modulation system output probe
Light pulse signal aP, the 3rd output end of 1x3 optical beam-splitter arrays is connected with the input of rising tone light modulation system, and second
The output end of acousto-optic modulation system is connected with the input of falling tone light modulation system, falling tone light modulation system output control light
Pulse signal aC；The tunable laser uses low noise, narrow linewidth, ti sapphire laser；The optical parametric amplifier
Produce the compressed state optical field with Atomic absorption lines matching；Described first, the 3rd, falling tone light modulation system is by a pair of acousto-optic modulations
Device is constituted；The rising tone light modulation system is made up of two double secondary acousto-optic modulators passed through.
3. a kind of high efficiency quantum storing device of continuous variable non-classical optical state according to claim 1, its feature exists
In：The atomic system is made up of atomic components and optical resonator, and the optical resonator is by the flat hysteroscope of two panels, two plate curvatures
The concavees lens composition that the plano-concave hysteroscope and a piece of focal length that radius is 1000mm are 30mm；The optical resonator is using four mirrors annular
Cavity configuration, a length of 1456mm of its chamber；First flat hysteroscope is as input and output coupling mirror, and the transmitance to probe light is 20%；
Second flat hysteroscope is high to probe light anti-；Two panels plano-concave hysteroscope is high to probe light anti-, and a piece of plano-concave hysteroscope is fixed on pressure
On electroceramics；The atomic components are located in the middle of two plano-concave hysteroscopes of optical resonator.
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| CN109856888A (en) * | 2019-02-25 | 2019-06-07 | 山西大学 | A kind of device and method enhancing the continuous variable compressed state optical field degree of compression |
| CN110133941A (en) * | 2019-04-28 | 2019-08-16 | 山西大学 | A kind of quasi-continuous quantum Squeezed Vacuum generation device |
| CN112994691A (en) * | 2021-02-23 | 2021-06-18 | 北京无线电计量测试研究所 | Preparation method of non-Hermite system spin compression state |
| CN113014257A (en) * | 2021-02-23 | 2021-06-22 | 北京无线电计量测试研究所 | Preparation method of cold atom system spin compression state |
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