Quantum interference measurement device and quantum interference measurement method based on squeezed vacuum state injection
A quantum interference and measurement device technology, applied in measurement devices, optical devices, instruments, etc., can solve the problem of high requirements for detection sensitivity, and achieve the effect of improving system sensitivity and improving systemic noise ratio
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specific Embodiment approach 1
[0039] Specific implementation mode one: combine figure 1 The quantum interference measurement device based on compressed vacuum state injection in this embodiment specifically includes:
[0040] Pulse laser 1, optical parametric oscillator 2, first beam splitter 3-1, second beam splitter 3-2, collimated beam expander emitter 4, collimated beam receiver 5, first photon detector 6 and a second photon detector 7 and a synchronization signal processor 8;
[0041]The pulsed laser 1 produces a fluctuating coherent light field with an average photon number; the coherent light field enters one side of the first beam splitter 3-1; the optical parametric oscillator 2 is used to control the first beam splitter by nonlinear optical means The vacuum state of 3-1 is compressed to generate a compressed vacuum state, and the compressed vacuum state quantum light field is injected into the other side of the first beam splitter 3-1; the coherent state light field passing through the first be...
specific Embodiment approach 2
[0051] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the pulsed laser 1 is used as the light source of the system, which requires high power stability and frequency stability, and requires the pulsed laser to be able to output stable polarization pulses Laser; pulse laser 1 with a power stability of 0-4%, a repetition frequency of 10KHz, and a pulse width of 10ns; the model of pulse laser 1 is LPS-A-532 from Changchun New Industry Optoelectronics Technology Co., Ltd.;
[0052] The optical parametric oscillator 2 compresses the vacuum state at the vacant end in a specific direction by nonlinear optical means to generate a compressed vacuum state, and injects the quantum light field of the compressed vacuum state into the first beam splitter 3-1;
[0053] Optical parametric oscillator 2 includes F-P cavity Fabry-Perot Fabry-Perot, OPA cavity optical parametric amplification optical parameter amplification and mode cleaning cavity;...
specific Embodiment approach 3
[0063] Specific implementation mode three: This implementation mode is based on the quantum interferometry method of compressed vacuum state injection, specifically according to the following steps:
[0064] Step 1, using the pulse laser 1 to generate a coherent light field with an average photon number fluctuation of 0-4%; the coherent light field enters one side of the first beam splitter 3-1;
[0065] Step 2: Use the optical parametric oscillator 2 to compress the vacuum state of the second beam splitter 3-2 through nonlinear optical means to generate a compressed vacuum state, and inject the compressed vacuum state quantum light field into the first beam splitter 3-1 the other side of
[0066] Using the optical parametric oscillator 2 to compress the vacuum state of the second beam splitter 3-2 through nonlinear optical means to generate a compressed vacuum state is specifically as follows image 3 :
[0067] The optical parametric process is currently the most commonly ...
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