CN105404073B - All-optical logic gates based on quantum dot double mould cavity coupled system - Google Patents
All-optical logic gates based on quantum dot double mould cavity coupled system Download PDFInfo
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Abstract
The embodiment of the invention discloses two kinds of all-optical logic gates, the first all-optical logic gates includes：Two fiber waveguide, quantum dot bimodulus microcavity, first mode photon detector and the second mode photon detectors with time delay device；Wherein, the difference between the first delay parameter of the first fiber waveguide and the second delay parameter of the second fiber waveguide is the specific time delay value Δ t set previously according to result of the test.Second of all-optical logic gates includes：Two polarization beam apparatus, five fiber waveguide, three quantum dot bimodulus microcavitys, first mode photon detector and the second mode photon detectors for not having time delay device；Three quantum dot bimodulus microcavitys, when the optical signal of input only has a kind of mode optical signal, this kind of mode response optical signal of output has the specific time delay value Δ t of identical to the response optical signal of another pattern of output.Based on quantum interference cancellation effect, above-mentioned all-optical logic gates can realize the function of logic " non-", "AND" and "or".
Description
Technical field
It is more particularly to a kind of based on the complete of quantum dot-double mould cavity coupled system the present invention relates to all-optical logic gates field
Optical logic device.
Background technology
By all-optical information handle based on super high speed all-optical communication network there is low energy expenditure, big network capacity, height
The advantages that network flexibility and reliability, turn into the important force for promoting new network development.Simultaneously in quantum information processing, amount
All-optical switch and all-optical logic gates in the application such as sub-network on a small number of few photon levels have also attracted the attention of people, turn into
Study hotspot in recent years.
The nonlinear interaction of light and material is the physical basis of complex designing photonic device.Traditional nonlinear interaction needs
Light intensity that will be stronger, is unfavorable for photonic system and integrates.For few photon level, need to exist using Eurytrema coelomatium in theory
The interaction of light and material is studied under full dose subframe, analyzes the quantum state and nonlinear optical properties of coupled system.It is actual
In preparation, micro-nano photonic device receives significant attention as solving the integrated key of device in full light processing.At this stage, base
There is great application potential in fields such as quantum communications, quantum calculation, quantum light sources in the Fourier Series expansion technique of quantum dot-microcavity,
As a chief component of few photon level device.
Quantum dot be in three dimensions all limited, yardstick nanometer scale semi-conducting material, due to possessing similar original
The discrete energy level structure of son is otherwise known as " artificial atom ".Using the quantum dot of epitaxial growth show bright emission,
The wave-length coverage of the spectrum width of preferable stability and finite lifetime, very small association in time function and non-constant width under low temperature
Advantageous properties such as (ultraviolet to infrared), is especially suitable for preparing quantum light source.At the same time, if quantum dot and fiber waveguide device and micro-
The spatial light field Mode Coupling of chamber, then spontaneous emission efficiency can be increased by Purcell effects.
In recent years, quantum dot-single mode microcavity Fourier Series expansion technique is concentrated in main research work, and single based on this design, preparation
Photon and two-photon entanglement source.One-mode cavity can only accommodate an optical mode, i.e., quantum dot can only resonant frequency with it is single
Polarization mode coupling, the interaction in system are relatively fixed, simply, cause to be not easy the photon device that sophisticated functions is realized in design
Part.Meanwhile quantum dot-one-mode cavity is often realized in control using externally-applied magnetic field not easy of integration, can not realize full light
Logical device.
Therefore all-optical logic control how is realized, turns into integrated photon loop and full optical oomputing crucial science urgently to be resolved hurrily
Problem.
The content of the invention
The embodiment of the invention discloses a kind of all-optical logic gates based on quantum dot-double mould cavity coupled system, to realize
All-optical logic controls.Technical scheme is as follows：
A kind of all-optical logic gates based on quantum dot-double mould cavity coupled system, including：Two light with time delay device
Waveguide, quantum dot-bimodulus microcavity, first mode photon detector and second mode photon detector；
Wherein, the time delay device of the first fiber waveguide has the first delay parameter Δ t1, the time delay device tool of the second fiber waveguide
There is the second delay parameter Δ t2；And the first difference between delay parameter and the second delay parameter is sets previously according to result of the test
The specific time delay value Δ t put；
First fiber waveguide, for by from the first input optical signal that first input port receives input to quantum dot-
Bimodulus microcavity；First input optical signal be with the first mode optical signal of quantum dot-bimodulus microcavity have identical polarization and
The pulse laser of wavelength；
Second fiber waveguide, for by the second input optical signal received from the second input port input to quantum dot-
Bimodulus microcavity；Second input optical signal be with the second mode optical signal of quantum dot-bimodulus microcavity have identical polarization and
The pulse laser of wavelength；
The first mode photon detector, first in response signal for detecting quantum dot-bimodulus microcavity output
Pattern photon, the second mode photo-detector, the second mould in response signal for detecting quantum dot-bimodulus microcavity output
Formula photon；
Inputted at the time of the first input optical signal is inputted to the first fiber waveguide with the second input optical signal light to the second light
When identical at the time of waveguide, it is small that the first mode photon detector or second mode photon detector detect delay parameter
The optical signal of fiber waveguide input；
When only the first input optical signal is inputted to the first fiber waveguide, or only the second input optical signal is inputted to the second light
During waveguide, the first mode photon detector and second mode photon detector detect optical signals.
It is preferred that the specific time delay value Δ t set previously according to result of the test, is determined by equation below：
Δ t=-4.3 × 10-4(g/2π)3+0.0492(g/2π)2-2.18(g/2π)+38.5；
Wherein, g is point-chamber stiffness of coupling of the quantum dot-bimodulus microcavity, and Δ t and g unit is respectively ps and GHz.
It is preferred that input port of the first input port as signal, control of second input port as photoswitch
Port processed；And first delay parameter be less than the specific time delay value Δ t of the second delay parameter；The light patterns received with control port
Output end of the output end of corresponding photon detector as photoswitch；
When control port is without input signal, the output end output signal of the photoswitch；When control port has input to believe
Number when, the output end non-output signal of the photoswitch；
The on-off ratio of the photoswitch is 20<g/2π<In the range of 40, numerical value is more than 12dB.
It is preferred that in described first input port and the second input port, an input port is as logic inverter
Input port, control port of another input port as logic inverter, control light are ahead of flashlight, and advanced argument is described
Specific time delay value Δ t；The output end of photon detector corresponding with the light patterns that control port receives is as logic NOT
The output end of door.
It is preferred that the time delay device of the first described fiber waveguide is 1 adjustable time delay devices of the first delay parameter Δ t；Institute
The time delay device for stating the second fiber waveguide is the second adjustable time delay devices of delay parameter Δ t2.
Another all-optical logic gates based on quantum dot-double mould cavity coupled system, including：Two polarization beam apparatus, five
The individual fiber waveguide without time delay device, three quantum dots-bimodulus microcavity, first mode photon detector and second mode photon
Detector；
Wherein, the first polarization beam apparatus, for receiving the first input optical signal of first input port input；When first defeated
, will when optical signal is the pulse laser for having identical polarization and wavelength with the first mode optical signal of quantum dot-bimodulus microcavity
First input optical signal is inputted to the first quantum dot-bimodulus microcavity；When the first input optical signal is and quantum dot-bimodulus microcavity
When second mode optical signal has the pulse laser of identical polarization and wavelength, the first input optical signal is inputted to the first light wave
Lead；
First quantum dot-bimodulus microcavity, for being believed the first mode light in response signal by the 4th fiber waveguide
Number input is to three quantum dots-bimodulus microcavity；
First fiber waveguide, for second mode optical signal to be inputted to the 3rd fiber waveguide；
3rd fiber waveguide, for the second mode optical signal received from the first fiber waveguide to be inputted to the first quantum
Point-bimodulus microcavity；
Second polarization beam apparatus, for receiving the second input optical signal of the second input port input；When the second input light
When signal is the pulse laser for having identical polarization and wavelength with the first mode optical signal of quantum dot-bimodulus microcavity, by second
Input optical signal is inputted to the second fiber waveguide；When the second input optical signal is to believe with the second mode light of quantum dot-bimodulus microcavity
Number have it is identical polarization and wavelength pulse laser when, the second input optical signal is inputted to the second quantum dot-bimodulus microcavity；
Second fiber waveguide, for first mode optical signal to be inputted to the 3rd fiber waveguide；
3rd fiber waveguide, it is additionally operable to input the first mode optical signal received from the second fiber waveguide to the second quantum
Point-bimodulus microcavity；
Second quantum dot-bimodulus microcavity, for being believed the second mode light in response signal by the 5th fiber waveguide
Number input is to three quantum dots-bimodulus microcavity；
Three quantum dots-bimodulus microcavity is connected with first mode photon detector and second mode photon detector；
The first mode photon detector, first in response signal for detecting quantum dot-bimodulus microcavity output
Pattern photon, the second mode photo-detector, the second mould in response signal for detecting quantum dot-bimodulus microcavity output
Formula photon；
The three quantum dots-bimodulus microcavity, only has a kind of mode light letter in the optical signal of quantum dot-bimodulus microcavity input
Number when, when the response optical signal of this kind of pattern of output has identical specific the response optical signal of another pattern of output
Prolong value Δ t；
When the first input signal light is different from the second input signal light, and the first input signal light is inputted to the first polarization point
When identical at the time of input at the time of beam device with the second input signal light to the second polarization beam apparatus, the first mode photon is visited
Survey device and second mode photon detector detects optical signals；
When the first input signal light is identical with the second input signal light, and the first input signal light is inputted to the first polarization point
It is only corresponding with input optical signal when identical at the time of input at the time of beam device with the second input signal light to the second polarization beam apparatus
First mode photon detector or second mode photon detector detection optical signals.
It is preferred that the input of described first input port and the second input port as logical AND gate or logic sum gate
End；
Output end of the output end of the first mode photon detector as logic sum gate；
Output end of the output end of the second mode photon detector as logical AND gate.
Present inventor is obtained by calculating analysis and Numerical Validation, for quantum dot-bimodulus microcavity, when a pattern
Excitation be delayed when having specific relative to the excitation of another pattern, the exciter response of hysteresis has the effect of elimination.This hair
Bright embodiment is exactly that make use of this principle, in the case of double excitation, using the time delay between double excitation, realizes few photon level
On all-optical switch and inverter all-optical logic gates, and by cascading this coupling, obtain logical "and" and the full light of logical "or"
Logical device.
Certainly, any product or method for implementing the present invention must be not necessarily required to reach all the above excellent simultaneously
Point.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the second mode signal light energy for quantum dot-bimodulus microcavity that the embodiment of the present invention uses with Δ t and g
The scanning graph of a relation of change；
Fig. 2 is the switching effect schematic diagram for quantum dot-bimodulus microcavity that the embodiment of the present invention uses；
Fig. 3 is a kind of logical construction schematic diagram of all-optical logic gates provided in an embodiment of the present invention；
Fig. 4 is two time intervals and point-chamber coupling constant g for quantum dot-bimodulus microcavity that the embodiment of the present invention uses
Graph of a relation；
Fig. 5 is the switching effect schematic diagram after 2 quantum dots-bimodulus microcavity concatenation；
Fig. 6 is the logical construction schematic diagram of another all-optical logic gates provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Quantum dot-bimodulus microcavity that the embodiment of the present invention uses, there is bimodulus microcavity to be coupled with two energy level neutrality quantum dots
Structure.Chamber mould is two patterns that wavelength is equal but polarization is mutually orthogonal.Two patterns respectively all with quanta point resonance.Together
When, the two beam Gaussian-shaped pulse laser that, wavelength identical with two pattern difference of microcavity and the resonance of chamber mould are polarized using two beams are made
For the pumping signal of input.The parameter of two beam exciting lasers correspond to two patterns of chamber, the i.e. respective polarization state of laser respectively,
Wavelength is consistent with corresponding chamber mould.For the sake of convenient, hereinafter unify that exciting laser is designated as into Laser A and Laser respectively
B.The response signal of corresponding chamber mould output is designated as Mode a and Mode b.Assuming that quantum dot is sufficiently small relative to chamber, therefore only examine
Consider the direct excitation cavity mould of laser and ignore incentive action of the laser to quantum dot.
Can obtain Hamiltonian based on CQED is
WhereinThe annihilations operator of the photon of two kinds of orthogonal polarization modes of chamber mould is represented respectively,For quantum dot to
Lower transition operator.G is the stiffness of coupling of quantum dot and chamber mould.εa,εbFor the excitation density of pumping laser.
By calculating analysis and Numerical Validation, we can obtain, when the excitation of a pattern is relative to another pattern
Excitation when having specific time delay Δ t, quantum interference cancellation effect can be shown.
Due to Hamiltonian and time correlation, and present invention is primarily concerned with point-chamber system's transient response, solution can not be obtained
Analysis solution.Therefore simulated using Monte Carlo quantum trajectory method.Actuation duration difference Δ t plays decisive work to the energy of response light
With, and Δ t is with point-chamber coupling constant g change.Other parameters are fixed on a rational numerical value (π of κ/2 π=40, γ/2
=1GHz).Scanning graph of a relation-Fig. 1 that Mode b responses light energy changes with Δ t and g is made, wherein, 0≤Δ t≤40ps,
10≤g/2π≤40GHz。
As shown in figure 1, as (κ/2 π=40, γ/2 π=1GHz), this specific time delay Δ t by with stiffness of coupling
Relation can be read from scanning figure, and the result of fitting is given by, and wherein Δ t and g takes unit ps and GHz respectively：
Δ t=-4.3 × 10-4(g/2π)3+0.0492(g/2π)2-2.18(g/2π)+38.5 (2)
The switching effect for quantum dot-bimodulus microcavity that the embodiment of the present invention uses is as shown in Figure 2.
As Fig. 2 a are visible, when quantum dot-when being actuated to first mode optical signal Laser A of bimodulus microcavity input, quantum
The response signal of point-bimodulus microcavity output has Mode a and Mode a b, and it is Δ t that Mode b, which lag behind Mode a time,.
As Fig. 2 b are visible, as quantum dot-bimodulus microcavity input two excitations-first mode optical signal Laser A and Laser
B, and when Laser B lag behind Laser A Δ t, the response signal of quantum dot-bimodulus microcavity output only has Mode a, Mode b
Substantially all balanced out.
Similarly, as Fig. 2 c are visible, as quantum dot-bimodulus microcavity input two excitations-first mode optical signal LaserA and
Laser B, and when Laser A lag behind Laser B Δ t, the response signal of quantum dot-bimodulus microcavity output is mainly Mode
B, Mode a are all balanced out substantially.
The embodiment of the present invention utilizes above-mentioned principle, there is provided two kinds of specific all-optical logic gates.
As shown in figure 3, a kind of all-optical logic gates provided in an embodiment of the present invention, including：Two have time delay device
Fiber waveguide 301 and 302, quantum dot-bimodulus microcavity 303, first mode photon detector 304 and second mode photon detector
305；
Wherein, the time delay device of the first fiber waveguide 301 has the first delay parameter Δ t 1, the delay of the second fiber waveguide 302
Device has the second delay parameter Δ t2；And the first difference between delay parameter and the second delay parameter is previously according to experiment
As a result specific time delay value Δ t (the i.e. foregoing Δ t) set；
First fiber waveguide 301, for will believe from the first input light that first input port (not shown in Fig. 3) receives
Number input is to quantum dot-bimodulus microcavity 303；First input optical signal is the first mode light with quantum dot-bimodulus microcavity
Signal has the pulse laser of identical polarization and wavelength；
Second fiber waveguide 302, for will believe from the second input light that the second input port (not shown in Fig. 3) receives
Number input is to quantum dot-bimodulus microcavity 303；Second input optical signal is the second mode light with quantum dot-bimodulus microcavity
Signal has the pulse laser of identical polarization and wavelength；
The first mode photon detector 304, the in the response signal for detecting the output of quantum dot-bimodulus microcavity
One pattern photon, the second mode photo-detector 305, the of response signal for detecting the output of quantum dot-bimodulus microcavity
Two modes photon；
Inputted at the time of the first input optical signal is inputted to the first fiber waveguide 301 with the second input optical signal to the second light
When identical at the time of waveguide 302, the first mode photon detector 304 or second mode photon detector 305 are detected and prolonged
When parameter it is small fiber waveguide input optical signal；
When only the first input optical signal is inputted to the first fiber waveguide 301, or only the second input optical signal is inputted to
During two fiber waveguides 302, the first mode photon detector 304 and second mode photon detector 305 detect optical signals.
Specifically, when only the first input optical signal Laser A are inputted, output first mode response optical signal Mode a
Optical signal Mode b are responded with second mode, and the second mode response optical signal Mode b exported lag behind described the of output
One mode response optical signal Mode a, the time of hysteresis is Δ t.It will be appreciated by those skilled in the art that ought only second mode
When optical signal Laser B are inputted, situation is as the same.
When the first input optical signal input Laser A to the first fiber waveguide 301 at the time of with the second input optical signal Laser
B inputs to phase at the time of the second fiber waveguide 302 simultaneously as the delayer of the first fiber waveguide 301 and prolonging for the second fiber waveguide 302
When device time-lag action (for example, wherein the delay parameter of the first delayer be less than the second delayer delay parameter, differ as Δ
T) so that actually enter the first input optical signal Laser A of quantum dot-bimodulus microcavity 303 earlier than the second input optical signal
Laser B.Based on above-mentioned principle, output only has first mode response optical signal Mode a, second mode optical signal Mode b
Substantially all balanced out.In this case, first mode photon detector corresponding with the first input optical signal Laser A
First mode optical signal Mode a can just be detected.
At the time of the first input optical signal Laser A are inputted to the first fiber waveguide 301 with the second input optical signal Laser
B inputs to phase at the time of the second fiber waveguide 302 simultaneously as the delayer of the first fiber waveguide 31 and prolonging for the second fiber waveguide 302
When device time-lag action (for example, wherein the delay parameter of the second delayer be less than the first delayer delay parameter, differ as Δ
T) so that actually enter the second input optical signal Laser B of quantum dot-bimodulus microcavity 303 earlier than the first input optical signal
Laser A, based on above-mentioned principle, it is basic that output only has second mode optical signal Mode b, first mode optical signal Mode a
All balanced out.In this case, second mode photon detector corresponding with the second input optical signal can just detect
To second mode optical signal.
In embodiment illustrated in fig. 3, described specific time delay value Δ t, also determined by equation below：
Δ t=-4.3 × 10-4(g/2π)3+0.0492(g/2π)2-2.18(g/2π)+38.5；
Wherein, g is point-chamber stiffness of coupling of the quantum dot-bimodulus microcavity, and Δ t and g unit is respectively ps and GHz.
In embodiment illustrated in fig. 3, all-optical logic gates can realize photoswitch.
Specifically：Input port of the first input port as signal, control of second input port as photoswitch
Port processed；And first delay parameter be less than the specific time delay value Δ t of the second delay parameter；The light patterns received with control port
Output end of the output end of corresponding photon detector as photoswitch；
When control port is without input signal, the output end output signal of the photoswitch；When control port has input to believe
Number when, the output end non-output signal of the photoswitch；
The on-off ratio of the photoswitch is 20<g/2π<In the range of 40, numerical value is more than 12dB.
It should be noted that when being fitted specific time delay value Δ t curves further according to Fig. 1, as long as ensureing on-off ratio 20<g/2<
In the range of 40.
In practical application, the all-optical logic gates shown in Fig. 3 can also realize logic inverter.
Specifically, can be by described first input port and the second input port, an input port is as logic
The input port of NOT gate, control port of another input port as logic inverter, control light are ahead of flashlight, advanced argument
For described specific time delay value Δ t；The output end conduct of photon detector corresponding with the light patterns that control port receives
The output end of logic inverter.
Such as：First input port is as input port, control port of second input port as logic inverter, and second
Output end of the output end of photon detector as logic inverter.
In addition, in order to increase the compatibility of all-optical logic gates shown in Fig. 3, the time delay device of the first described fiber waveguide can
To use 1 adjustable time delay devices of the first delay parameter Δ t；Likewise, the time delay device of second fiber waveguide can use
The second adjustable time delay devices of delay parameter Δ t2.As long as ensure that mode optical signal to be cancelled lags behind another mode light letter
Number input to quantum dot-bimodulus microcavity, the value of hysteresis is the specific time delay value Δ t.
Fig. 4 is two time intervals and point-chamber coupling constant g for quantum dot-bimodulus microcavity that the embodiment of the present invention uses
Graph of a relation.Wherein, solid line represent use of the embodiment of the present invention quantum dot-bimodulus microcavity produce switching effect it is specific when
Prolong Δ t, that is, the application interval between two excitation Laser A and Laser B, read in the scanning figure by above-mentioned Fig. 1.Dotted line
When represent the excitation of one single-mode of application, the interval between the peak value of both of which response light.It can be seen that the two
Time interval is almost consistent.Therefore, can be with the both of which of single-mode laser pumping quantum dot-bimodulus microcavity output
Response optical signal, as the excitation of another identical quantum dot-bimodulus microcavity, anticipated that and remain above-mentioned carried
The switching effect arrived.
Specifically, as shown in Figure 5 a, when two quantum dots-bimodulus microcavity series connection, to first quantum dot-bimodulus microcavity
The input light of pulse laser first that the first mode optical signal of input and quantum dot-bimodulus microcavity has identical polarization and wavelength is believed
Number Laser A, the response of output as shown in Figure 5 b, there is first mode response optical signal Mode a and second mode response optical signal
Mode b, and it is Δ t that Mode b, which lag behind Mode a time,.It regard Mode a and Mode b as second quantum dot-bis- again
The input of mould microcavity, because the Mode b times for lagging behind Mode a are Δ t, therefore the response exported is as shown in Figure 5 c, only
Response signal Mode a, response signal Mode b are canceled out.
Based on this principle, the embodiments of the invention provide another all-optical logic gates.
As shown in fig. 6, another all-optical logic gates provided in an embodiment of the present invention, including：Two polarization beam apparatus 601
With 602, five fiber waveguide 603-607, three quantum dots-bimodulus microcavity 608-610, the first mode light for not having time delay device
Sub- detector 611 and second mode photon detector 612；
Wherein, the first polarization beam apparatus 601, first for receiving first input port (not shown in Fig. 6) input are defeated
Optical signal；When the first input optical signal is to have identical polarization and ripple with the first mode optical signal of quantum dot-bimodulus microcavity
During long pulse laser, the first input optical signal is inputted to the first quantum dot-bimodulus microcavity 608；When the first input optical signal
During to have the pulse laser of identical polarization and wavelength with the second mode optical signal of quantum dot-bimodulus microcavity, by the first input
Optical signal is inputted to the first fiber waveguide 603；
First quantum dot-bimodulus microcavity 608, for by the 4th fiber waveguide 606 by the first mould in response signal
Formula optical signal is inputted to three quantum dots-bimodulus microcavity 610；
First fiber waveguide 603, for second mode optical signal to be inputted to the 3rd fiber waveguide 605；
3rd fiber waveguide 605, for the second mode optical signal that receipts are connected from the first light wave 603 to be inputted to first
Quantum dot-bimodulus microcavity 608；
Second polarization beam apparatus 602, for receiving the second input light letter of the second input port (not shown in Fig. 6) input
Number；When the second input optical signal is with having the arteries and veins of identical polarization and wavelength for the first mode optical signal of quantum dot-bimodulus microcavity
During impulse light, the second input optical signal is inputted to the second fiber waveguide 604；When the second input optical signal is and quantum dot-bimodulus
When the second mode optical signal of microcavity has the pulse laser of identical polarization and wavelength, the second input optical signal is inputted to second
Quantum dot-bimodulus microcavity 609；
Second fiber waveguide 604, for first mode optical signal to be inputted to the 3rd fiber waveguide 605；
3rd fiber waveguide 605, it is additionally operable to input the first mode optical signal received from the second fiber waveguide 604 to
Two quantum dots-bimodulus microcavity 609；
Second quantum dot-bimodulus microcavity 609, for by the 5th fiber waveguide 607 by the second mould in response signal
Formula optical signal is inputted to three quantum dots-bimodulus microcavity 610；
Three quantum dots-bimodulus microcavity 610 and first mode photon detector 611 and second mode photon detector
612 are connected；
The first mode photon detector 611, it is described for detecting the first mode photon of quantum dot-bimodulus microcavity
Second mode photo-detector 612, for detecting the second mode photon of quantum dot-bimodulus microcavity；
Three quantum dots-bimodulus microcavity 608-610, only has one kind in the optical signal of input quantum dot-bimodulus microcavity
During mode optical signal, the response optical signal of this kind of pattern of output has identical to the response optical signal of another pattern of output
Specific time delay value Δ t；
When the first input signal light is different from the second input signal light, and the first input signal light is inputted to the first polarization point
When identical at the time of input at the time of beam device 601 with the second input signal light to the second polarization beam apparatus 602, the first mode
Photon detector 611 and second mode photon detector 612 detect optical signals；
When the first input signal light is identical with the second input signal light, and the first input signal light is inputted to the first polarization point
When identical at the time of input at the time of beam device 601 with the second input signal light to the second polarization beam apparatus 602, only believe with input light
First mode photon detector 611 corresponding to number or second mode photon detector 612 detect optical signals.
Specifically,
1) when the first input signal light Input1 and the second input signal light Input2 are first mode flashlight Laser
During A, Mode a and Mode b both of which in the response signal that the first and second quantum dots-bimodulus microcavity 608 and 609 exports
Photon is present.The peak value of Mode b number of photons will be late by Δ t relative to the peak value of Mode a mould number of photons.First quantum dot-
Mode a photon is coupled into three quantum dots-bimodulus microcavity 610 by bimodulus microcavity 608 using the 4th fiber waveguide；Second quantum
Mode b photon is coupled into three quantum dots-bimodulus microcavity 610 by point-bimodulus microcavity 609 using the 5th fiber waveguide.For
For three quantum dots-bimodulus microcavity 610, because Mode b as the time that excitation lags behind excitation Mode a are Δ t, therefore,
Now only have the first photon detector 611 to detect first mode response signal Mode a.
2) when Input1 and Input2 flashlight is all second mode flashlight Laser B, with 1) in by contrast,
The peak value of Mode b number of photons is relative to the peak value of Mode a mould number of photons by advanced Δ t.Similarly, now only the second photon is visited
Second mode response signal Mode b can be detected by surveying device 612.
3) when Input1 flashlight Laser A, Input2 are Laser B.For the first quantum dot-bimodulus microcavity
For 608, the peak value of Mode b number of photons will be late by Δ t relative to the peak value of Mode a mould number of photons；For the second quantum dot-
For bimodulus microcavity 609, the peak value of Mode b number of photons is relative to the peak value of Mode a mould number of photons by advanced Δ t, the 4th He
5th fiber waveguide is respectively by the response Modea of the first quantum dot-bimodulus microcavity 608 and the sound of the second quantum dot-bimodulus microcavity 609
Mode b are answered to be coupled into three quantum dots-bimodulus microcavity 610.Now, for three quantum dots-bimodulus microcavity 610, swash
Encourage Mode a and Mode b be while, in the absence of lead lag relationship, the first and second photon detectors 611 and 612 difference
Detect Mode a photons and Mode b photons.
Simple and clear, by discussed above with as shown in table 1：
Table 1
Wherein, input signal Laser A are represented with letter r, and are considered as logic 1；Input signal Laser B letter b tables
Show and be considered as logical zero.As can be seen from Table 1, logic has been acted in effect as detecting Mode a the first photon detector 611
The role of OR gate, and be then logical AND gate for detecting Mode b the second photon detector 612.The light relatively of two detectors
Strong ratio is up at least 11dB (20<g/2π<40), wherein largest light intensity ratio is 16dB.
Specifically, described first input port and the second input port can be as logical AND gate or logic sum gates
Input；The output end of the first mode photon detector can be as the output end of logic sum gate；The second mode light
The output end of sub- detector can be as the output end of logical AND gate.
From the above embodiments, this all-optical logic gates of the embodiment of the present invention, it is not necessary to as prior art that
Sample externally-applied magnetic field, it becomes possible to the all-optical logic of " non-", "AND" and "or" is realized, it is simple in construction easily to realize.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply and deposited between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability includes, so that process, method, article or equipment including a series of elements not only will including those
Element, but also the other element including being not expressly set out, or it is this process, method, article or equipment also to include
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element also be present in process, method, article or equipment including the key element.
Each embodiment in this specification is described by the way of related, identical similar portion between each embodiment
Divide mutually referring to what each embodiment stressed is the difference with other embodiment.It is real especially for device
For applying example, because it is substantially similar to embodiment of the method, so description is fairly simple, related part is referring to embodiment of the method
Part explanation.
Can one of ordinary skill in the art will appreciate that realizing that all or part of step in above method embodiment is
To instruct the hardware of correlation to complete by program, described program can be stored in computer read/write memory medium,
The storage medium designated herein obtained, such as：ROM/RAM, magnetic disc, CD etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent substitution and improvements made within the spirit and principles in the present invention etc., are all contained in protection scope of the present invention
It is interior.
Claims (7)
- A kind of 1. all-optical logic gates based on quantum dot-double mould cavity coupled system, it is characterised in that including：Two have prolong When device fiber waveguide, quantum dot-bimodulus microcavity, first mode photon detector and second mode photon detector；Wherein, the time delay device of the first fiber waveguide has the first delay parameter Δ t1, and the time delay device of the second fiber waveguide has the Two delay parameter Δ t2；And the first difference between delay parameter and the second delay parameter is to be set previously according to result of the test Specific time delay value Δ t；First fiber waveguide, for will be inputted from the first input optical signal that first input port receives to quantum dot-bimodulus Microcavity；First input optical signal is to have identical polarization and wavelength with the first mode optical signal of quantum dot-bimodulus microcavity Pulse laser；Second fiber waveguide, for the second input optical signal received from the second input port to be inputted to quantum dot-bimodulus Microcavity；Second input optical signal is to have identical polarization and wavelength with the second mode optical signal of quantum dot-bimodulus microcavity Pulse laser；The first mode photon detector, the first mode in response signal for detecting quantum dot-bimodulus microcavity output Photon, the second mode photo-detector, the second mode light in response signal for detecting quantum dot-bimodulus microcavity output Son；Inputted at the time of the first input optical signal is inputted to the first fiber waveguide with the second input optical signal light to the second fiber waveguide At the time of it is identical when, the first mode photon detector or second mode photon detector detect the small light wave of delay parameter Lead the optical signal of input；When only the first input optical signal is inputted to the first fiber waveguide, or only the second input optical signal is inputted to the second fiber waveguide When, the first mode photon detector and second mode photon detector detect optical signals.
- 2. all-optical logic gates according to claim 1, it is characterised in that the spy set previously according to result of the test Fixed response time value Δ t, is determined by equation below：Δ t=-4.3 × 10-4(g/2π)3+0.0492(g/2π)2-2.18(g/2π)+38.5；Wherein, g is point-chamber stiffness of coupling of the quantum dot-bimodulus microcavity, and Δ t and g unit is respectively ps and GHz.
- 3. all-optical logic gates according to claim 2, it is characterised in that the first input port is as the defeated of signal Inbound port, control port of second input port as photoswitch；And first delay parameter be less than the second delay parameter it is specific when Prolong value Δ t；Output end of the output end of photon detector corresponding with the light patterns that control port receives as photoswitch；When control port is without input signal, the output end output signal of the photoswitch；When control port has input signal, The output end non-output signal of the photoswitch；The on-off ratio of the photoswitch is 20<g/2π<In the range of 40, numerical value is more than 12dB.
- 4. all-optical logic gates according to claim 2, it is characterised in that described first input port and the second input In port, input port of the input port as logic inverter, control terminal of another input port as logic inverter Mouthful, control light is ahead of flashlight, and advanced argument is described specific time delay value Δ t；The light patterns received with control port Output end of the output end of corresponding photon detector as logic inverter.
- 5. according to the all-optical logic gates described in claim any one of 1-4, it is characterised in that the first described fiber waveguide is prolonged When device be 1 adjustable time delay devices of the first delay parameter Δ t；The time delay device of second fiber waveguide is that the second delay is joined The adjustable time delay devices of number Δ t2.
- A kind of 6. all-optical logic gates based on quantum dot-double mould cavity coupled system, it is characterised in that including：Two polarizations point Beam device, five fiber waveguides without time delay device, three quantum dots-bimodulus microcavity, first mode photon detectors and second Pattern photon detector；Wherein, the first polarization beam apparatus, for receiving the first input optical signal of first input port input；When the first input light When signal is the pulse laser for having identical polarization and wavelength with the first mode optical signal of quantum dot-bimodulus microcavity, by first Input optical signal is inputted to the first quantum dot-bimodulus microcavity；When the first input optical signal is second with quantum dot-bimodulus microcavity When mode optical signal has the pulse laser of identical polarization and wavelength, the first input optical signal is inputted to the first fiber waveguide；First quantum dot-bimodulus microcavity, for by the 4th fiber waveguide that the first mode optical signal in response signal is defeated Enter to three quantum dots-bimodulus microcavity；First fiber waveguide, for second mode optical signal to be inputted to the 3rd fiber waveguide；3rd fiber waveguide, for the second mode optical signal received from the first fiber waveguide to be inputted to the first quantum dot-bis- Mould microcavity；Second polarization beam apparatus, for receiving the second input optical signal of the second input port input；When the second input optical signal During to have the pulse laser of identical polarization and wavelength with the first mode optical signal of quantum dot-bimodulus microcavity, by the second input Optical signal is inputted to the second fiber waveguide；When the second input optical signal is to have with the second mode optical signal of quantum dot-bimodulus microcavity When having the pulse laser of identical polarization and wavelength, the second input optical signal is inputted to the second quantum dot-bimodulus microcavity；Second fiber waveguide, for first mode optical signal to be inputted to the 3rd fiber waveguide；3rd fiber waveguide, be additionally operable to by the first mode optical signal received from the second fiber waveguide input to the second quantum dot- Bimodulus microcavity；Second quantum dot-bimodulus microcavity, for by the 5th fiber waveguide that the second mode optical signal in response signal is defeated Enter to three quantum dots-bimodulus microcavity；Three quantum dots-bimodulus microcavity is connected with first mode photon detector and second mode photon detector；The first mode photon detector, the first mode in response signal for detecting quantum dot-bimodulus microcavity output Photon, the second mode photo-detector, the second mode light in response signal for detecting quantum dot-bimodulus microcavity output Son；The three quantum dots-bimodulus microcavity, only has a kind of mode optical signal in the optical signal of quantum dot-bimodulus microcavity input When, the response optical signal of this kind of pattern of output has the specific time delay of identical to the response optical signal of another pattern of output It is worth Δ t；When the first input signal light is different from the second input signal light, and the first input signal light is inputted to the first polarization beam apparatus At the time of it is identical at the time of inputted with the second input signal light to the second polarization beam apparatus when, the first mode photon detector Optical signals are detected with second mode photon detector；When the first input signal light is identical with the second input signal light, and the first input signal light is inputted to the first polarization beam apparatus At the time of it is identical at the time of inputted with the second input signal light to the second polarization beam apparatus when, only corresponding with input optical signal One pattern photon detector or second mode photon detector detection optical signals.
- 7. all-optical logic gates according to claim 6, it is characterised in that described first input port and the second input Port is as logical AND gate or the input of logic sum gate；Output end of the output end of the first mode photon detector as logic sum gate；Output end of the output end of the second mode photon detector as logical AND gate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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Non-Patent Citations (3)
| Title |
|---|
| A quantum logic gate between a solid-state quantum bit and a photon;Hyochul Kim等;《nature photonics》;20130331;全文 * |
| Optimal photon antibunching in a quantum-dot–bimodal-cavity system;Wen Zhang等;《PHYSICAL REVIEW A》;20140421;全文 * |
| Two-photon emission in coupled biexciton quantum dot–cavity system: Phonon-assisted model;Peng Yi-Wei等;《Chin.Phys.B》;20141010;全文 * |
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