Optical pulse generating method capable of creating three-energy-level system quantum bit random superposition state
A quantum bit, optical pulse technology, applied in the field of optical pulse, can solve the problems of long pulse action time and poor robustness
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Embodiment 1
[0033] An optical pulse generation method that can create arbitrary superposition states of qubits in a three-level system, according to the initial state |1> and the target state of the system where θ a In the range [0, π], Take the value in the range of [0, 2π], use the adiabatic shortcut technology based on the Lewis-Riesenfeld invariant theory to reversely solve the time-dependent Schrödinger equation of the three-level system to obtain the amplitude and phase of the two optical pulses, and input the amplitude and phase The arbitrary wave generator generates a radio signal with the same amplitude and phase as the optical pulse, and uses this radio signal to drive the acousto-optic modulator in the continuous laser optical path to obtain +1 or -1 deflected output light, generating a set of two-color optical pulses;
[0034] Where: the driving frequency of the acousto-optic modulator is f aom , the laser frequency in the continuous laser path is f laser , the qubit is c...
Embodiment 2
[0053] The optical pulse generation method that can create any superposition state of the three-level system qubit based on the first embodiment, all a in the formula (4) n The values are all zero. at this time:
[0054]
[0055] Based on this γ(t) and β(t) shown in formula (5), the Rabi frequency of the light pulse generated by formulas (2) and (3) can be found in the attached figure 2 , where the solid line is Ω p , the dotted line is Ω s , the pulse action time is 4μs, the start and end values of the Rabi frequency are not equal to zero, and the maximum instantaneous Rabi frequency does not exceed 0.5MHz.
[0056] attached image 3 is the evolution of the quantum state |ψ(t)> with time during the interaction between the pulse and the detuned quantum system. At the initial moment, the quantum state is in the |1> state; at the end of the pulse, that is, t=4μs, the probability of the quantum state in both |0> and |1> is 50%, which is the same as the target state ...
Embodiment 3
[0060] The optical pulse generation method that can create any superposition state of qubits in the three-level system based on the first embodiment, a in formula (4) n All even and odd terms of satisfy the following two conditions respectively:
[0061] a 1 +3a 3 +5a 5 +7a 7 = 0,
[0062] a 2 +2a 4 +3a 6 +4a 8 =-0.5.
[0063] Then the Rabi frequency of the two light pulses at the initial and final moments is zero, that is, Ω p,s (t=0,tf)=0. By any a that satisfies these two relations n Substituting the value into (4), the constructed light pulse can manipulate the quantum system to create the target state |ψ target >, here in the simplest case a 2 =-0.5, a 1.3.4.5.6.7.8 =0 as an example to illustrate the shape of the light pulse and its working performance.
[0064] attached Figure 4 , is the Rabi frequency of the two-color light pulse in this embodiment, and the values at the initial and termination moments are both zero, avoiding the existence of multiple...
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