Entanglement imaging system and method based on dual-compression coincidence measurements

Abstract

The invention relates to an entanglement imaging system based on dual-compression coincidence measurements. The system comprises a laser, a nonlinear crystal, a narrow-band filter, a beam splitter, a first group of imaging lenses, a second group of imaging lenses, a first spatial light modulator, a second spatial light modulator, a first group of light converging lenses, a second group of light converging lenses, a first point detector, a second point detector, a coincidence measurement circuit and an algorithm module. The laser generates pump light, an entanglement photon pair is produced through nonlinear crystal and is divided into a signal light path and an idle light path after passing through the narrow-band filter to be projected onto the first spatial light modulator and the second spatial light modulator respectively; light is modulated, the modulated light is collected onto the first point detector and the second point detector to be converted into electric signals which are input in the coincidence measurement circuit, and a coincidence measurement value is output; and the algorithm module rebuilds spatial correlation coefficient distribution through a compressive sensing algorithm according to a measurement matrix and the measurement value.

Description

technical field [0001] The invention relates to the field of entangled light and coincidence measurement, in particular to an entanglement imaging system and method based on double compressed coincidence measurement. Background technique [0002] Spatially entangled two-photons are usually produced by spontaneous parametric down-conversion (SPDC), which can well reflect the Einstein-Podolsky-Rosen (EPR) properties The correlation between two-photon positions or the correlation between two-photon momentums. By measuring one of the photons, the state of the other photon in the photon pair can be deduced, which greatly improves the security of communication. Using the EPR effect, that is to prepare a pair of EPR related photon pairs, the two sides of the communication have a definite and invariable relationship. If the polarization state of one of the photons is measured upward, the other photon at a distant position at the same time The polarization state must be downward an...

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Problems solved by technology

[0005] In the prior art, there is no way to use the principle of compressed sensing to double-compress the total light intensity of the signal optical path and the idle optical path, and to establish a compressed sensing model based on the measured value and two-way binary random matrix to realize quantum entanglement imaging. device

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