Resonant cavity for generating single photon and single photon source system
A single-photon source and resonant cavity technology, applied in the field of resonant cavity and single-photon source system, can solve the problems of efficiency loss, background noise, etc., and achieve the effects of improving single-photon purity, photon generation rate and collection and utilization efficiency
Active Publication Date: 2021-07-02
CHINA JILIANG UNIV
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Problems solved by technology
However, while the resonance excitation method based on monochromatic light improves the quality of photons, the excitation light will bring background noise, which generally requires high-precision polarization filtering to remove it, resulting in a 50% efficiency loss.
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[0028] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings, but these embodiments do not limit the present invention, those of ordinary skill in the art make structural, method, or functional changes based on these embodiments All are included in the scope of protection of the present invention.
[0029] according to figure 1 As shown, a single photon source system, the system includes: a resonant cavity that generates single photons and an excitation light generation system;
[0030] The resonant cavity 20 includes a resonant cavity body and a substrate 40. The resonant cavity body includes an upper reflective layer 21, a lower reflective layer 23, and a sandwich structure formed by a grating layer 22 arranged in the middle of the upper reflective layer 21 and the lower reflective layer 23. The upper reflector The layer 21 and the lower reflective layer 23 adopt a metal film or a metal-like f...
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The invention discloses a resonant cavity for generating single photons, which comprises a resonant cavity body and a substrate, and is characterized in that the resonant cavity body comprises an upper reflecting layer, a lower reflecting layer and a sandwich structure formed by a grating layer arranged between the upper reflecting layer and the lower reflecting layer, the upper reflecting layer and the lower reflecting layer are made of metal films or metalloid films, the grating layer is provided with a grating microstructure to form an optical microcavity, the substrate is arranged at the bottom of the resonant cavity, the substrate is a truncated inverted conical substrate, and a two-dimensional superstructure used for improving the reflection efficiency is arranged on the surface, in contact with the lower reflection layer, of the substrate; the invention also comprises a single photon source system which comprises the resonant cavity and an exciting light generating system, the exciting light generating system emits exciting photons generated by the exciting light generating system into the resonant cavity, and the exciting photons are emitted from the resonant cavity after being reflected for multiple times in the grating microstructure.
Description
technical field [0001] The invention belongs to the field of single photon sources, and in particular relates to a resonant cavity and a single photon source system for generating single photons. Background technique [0002] Single-photon source technology, quantum encoding and transmission technology, and single-photon detection technology are the three core technologies in quantum communication. A large number of studies have proved that quantum communication is absolutely safe under a single-photon source, and has a high probability of occurrence. and absorption efficiency. [0003] An ideal single photon source can be used as a luminescent light source signal in quantum communication and quantum computing. The photon light source refers to the source of optical signal generation in the optical interconnection network, and the optical signal generated by it is a single photon. It can be seen that the ideal single photon source is an important guarantee for quantum comm...
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Login to View More IPC IPC(8): H01S3/06H01S3/08
CPCH01S3/0627H01S3/08059
Inventor 窦婷婷金尚忠石岩赵春柳陈君郝然
Owner CHINA JILIANG UNIV