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System and method for efficiently forecasting single photons

A single-photon, high-efficiency technology, applied in the field of optical quantum information, can solve problems such as forecasting single-photon technology false positives, simplifying system implementation difficulties, etc., and achieve the effect of improving forecasting efficiency

Pending Publication Date: 2020-12-22
南京南辉智能光学感控研究院有限公司 +1
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Problems solved by technology

[0003] Purpose of the invention: The present invention aims at the problem of false positives in the existing single-photon prediction technology, and provides a system and method for high-efficiency single-photon prediction. In the process of converting photon pairs under high pump laser excitation parameters, quantum blockade is used. The effect solves the problem of false alarms in the single-photon forecasting system, and can greatly improve the single-photon forecasting efficiency of the idler detector in a normal temperature environment, thereby improving the single-photon generation efficiency of the forecast signal and maintaining high purity. Further, by separating the parameters The down-conversion photon generation system and photon blocking system greatly simplify the difficulty of system implementation, such as figure 1

Method used

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  • System and method for efficiently forecasting single photons
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  • System and method for efficiently forecasting single photons

Examples

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example 1

[0034] Example 1: Using rubidium atomic bubbles to block idler photons to realize high-efficiency single-photon source prediction

[0035] Combined with the system diagram, the specific implementation of this example is as follows:

[0036] (1) Two sets of high-quality optical microcavities are built by four plano-concave mirrors. The planes of the mirrors 1-1 and 1-2 are coated with an anti-reflection coating for the light with a wavelength of 397.5nm, and the concave surface is also coated with an anti-reflection coating for the light with a wavelength of 397.5nm, so that the pump laser light can pass through without loss. Mirrors 1-3 are coated with a 795nm anti-reflection coating to allow idler light to pass through. The concave surfaces of the four mirrors are all coated with high-reflection coatings for light with a wavelength of 795nm.

[0037] (2) For light with a wavelength of 795nm, the reflectivity of the concave surfaces of mirrors 1-1 and 1-3 reaches 99.9%, and ...

example 2

[0051] Example 2: Cavity-enhanced high-efficiency predictive single-photon source using cesium atom bubbles

[0052] If the cesium atom D1 line is used to block the idler light, then the corresponding pump laser wavelength needs to be selected as 447.3nm, and the anti-reflection coating plated for the pump laser should also be selected at 447.3nm. The generated signal light and idler light are 894.6nm, and the film coated for signal light and idler light should also be selected at 894.6nm. The transition energy level of the cesium atom involved is , , , . The idler at 894.6nm couples two transitions 1 to 3 and 2 to 4, and the left-handed circular polarization at 894.6nm couples transitions 2 to 3.

example 3

[0053] Example 3: Using silicon color center defects in diamond to realize high-efficiency forecast single-photon source

[0054] In this implementation, the solid-state diamond film needs to be cooled to a low temperature of 4K, and a negatively charged silicon color center defect acts as an N-type energy level system. Similar to Example 2, the wavelength of the pump laser needs to be adjusted to 369nm, the wavelength of the signal light and idler light generated by the PPKTP crystal is 738nm, and the working wavelength of the corresponding antireflection coating and reflective coating should also be adjusted to 369nm and 738nm. The silicon color center defects involved correspond to the transition energy levels of , , . The horizontally polarized idler light at 738nm couples two transitions 1 to 3 and 2 to 4, and the right-handed circular polarization control light at 738nm couples transitions 2 to 3.

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Abstract

The invention relates to a method and a system for efficiently forecasting single photons by using a quantum blocking method. The forecasting efficiency of the single photons can be remarkably improved in virtue of the method and the system. The system comprises two sets of high-quality optical microcavities consisting of a beam of pumping laser with adjustable waveform, time length and power andfour reflecting mirrors. An idler frequency light field is induced to generate a strong Kerr optical nonlinear effect by carrying out light field regulation and control on atomic bubbles in an idler frequency light path, so an idler frequency light multi-photon state is blocked, and the false alarm probability of a detector is reduced. A single-photon detector is used for detecting idler frequencylight, and once a response exists, it means that the signal is a single-photon signal. Because the signal light and the idler frequency light are always generated in pairs, high-quality single photons are obtained in a signal light mode, so the forecasting efficiency and purity of the single photons are greatly improved. A cavity quantum electrodynamic system formed by atomic bubbles and two optical reflectors is separated from a parametric down-conversion system, so system implementation difficulty can be greatly reduced while single photon generation efficiency is improved and single photonpurity is kept.

Description

technical field [0001] The invention belongs to the field of optical quantum information technology, in particular to a system and method for high-efficiency single photon prediction Background technique [0002] With the development of optical quantum information technology (including quantum communication, quantum sensing, quantum simulation, and linear quantum computing, etc.), people are increasingly interested in true single-photon sources. Many different implementations have been investigated, such as using single-molecule or atomic excitations, diamond color centers, quantum dots, and pulsed or continuous wave parametric down-conversion sources, among others. Due to its advantages of indistinguishability, high purity, and simple preparation process, the single-photon source based on spontaneous parametric down-conversion has always been the best performance and most widely used single-photon generation method in optical quantum information technology (see Nature Nanot...

Claims

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Application Information

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IPC IPC(8): G02F1/35
CPCG02F1/3501
Inventor 唐江山吴浩东葛士军
Owner 南京南辉智能光学感控研究院有限公司
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