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Absolute self-demarcating method for single photon detector quantum efficiency and private equipment thereof

A single photon detector, quantum efficiency technology, applied in instruments and other directions, can solve problems such as neglecting stability

Inactive Publication Date: 2004-01-14
INST OF PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

This substitution method does not measure the one-to-one correspondence between the real signal photon and the idle photon, and ignores the influence of the pump laser source and the stability of the parametric down-conversion process, so it is no longer an absolute calibration method in essence.

Method used

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  • Absolute self-demarcating method for single photon detector quantum efficiency and private equipment thereof
  • Absolute self-demarcating method for single photon detector quantum efficiency and private equipment thereof
  • Absolute self-demarcating method for single photon detector quantum efficiency and private equipment thereof

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Embodiment Construction

[0029] The present invention will further describe embodiment in conjunction with accompanying drawing:

[0030] see image 3 , is a structural schematic diagram of the calibration device of the present invention. The pump laser 1 is a He-Cd laser with a wavelength of 441.6nm. Its laser passes through a nonlinear crystal such as BBO2, and generates entangled degenerate photon pairs through the type II parametric down-conversion process. The signal light photons are ordinary light, that is, o light and Idle light photons are extraordinary light, namely e light. Use the 45° total reflection mirror 3 at 441.6nm to reflect the pump laser included in the outgoing light, and then make the signal light and idle light enter the polarization beam splitter P at the same time 1 4. Propagate along the optical paths of o and e respectively, and use two plane mirrors to make the optical path of o optical path longer than the optical path of e optical path by / Δt c / n, where c is the speed ...

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Abstract

The invention relates to a single photon detector quantum efficiency absolute self-calibration method and dedicated apparatus therefore wherein, the parameter light beam is divided into two ways, then the time delay is introduced, making the twinning protons generated at spontaneously enter the single proton detector in sequence, then dividing the circuit after the detector into three ways, one of which enters directly into the counter to obtain the total counting ratio of the detected protons by the detector, the other two ways are led into the time lag corresponding to the optical path using the circuit method, and enter into the counter after the coincidence circuit, obtaining the coincidence counting rate of the proton pair arriving the detector in sequence, thus acquiring the quantum efficiency of the detector.

Description

technical field [0001] The invention relates to a method for calibrating the quantum efficiency of a single-photon detector that does not depend on additional measurement standards, in particular to an absolute self-calibrating method for the quantum efficiency of a single-photon detector and a special device thereof. Background technique [0002] The so-called quantum efficiency of a single photon detector refers to the ratio of the flow of photogenerated electrons flowing out of the detector to the flow of incident photons. In the field of metrology technology, in the field of scientific experiments and photoelectric detection, especially in the field of quantum communication in the future, the calibration of the quantum efficiency of single photon detectors is of great significance. The traditional calibration method needs to use a black body radiation source as high as 3000 K as a measurement standard, which has a large measurement uncertainty. In the early 1980s, a sel...

Claims

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Application Information

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IPC IPC(8): G01J11/00
Inventor 吴令安常君弢
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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