Method and apparatus for measuring time

Abstract

The present invention provides a method and device for measuring time and a programmable controller for quantum communication equipment. The method includes: receiving a START signal and a STOP signal; using the same clock to sample the signal to generate a A START bit string corresponding to the START signal and a STOP bit string corresponding to the STOP signal; extracting the rising edge of the START signal from the START bit string, and extracting the rising edge of the STOP signal from the STOP bit string ; determining the time interval between the START signal and the STOP signal based on the count of bits between the rising edge of the START signal and the rising edge of the STOP signal and the period of the clock. The present invention can realize the measurement of the arrival time of signals such as, but not limited to, photons without setting delay chains and complex calculations.

Description

technical field [0001] The invention relates to the technical field of time measurement, in particular to a method and device for measuring time and a programmable controller for quantum communication equipment. Background technique [0002] In related technologies, a TDC (Time To Digital Converter) module or an FPGA-based TDC module is mainly used to measure the arrival time of photons, and the TDC module usually realizes the above-mentioned Measurement. However, since the delay chain will cause the measured time result to shift with the change of temperature, the TDC module needs to correct the measured result in real time as the temperature changes, which will not only occupy a large amount of computing resources ( Such as FPGA resources, DSP resources, etc.), and it is difficult to meet the high-speed operation requirements of systems (such as, but not limited to, quantum communication systems). Contents of the invention [0003] The object of the present invention i...

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Problems solved by technology

However, since the delay chain will cause the measured time result to shift with the change of temperature, the TDC module needs to correct the measured result in real time as the temperature changes, which will not only occupy a large amount of computing resources ( such as FPGA resources, DSP resources, etc.), and it is difficult to meet the high-speed operation requirements of systems (such as, but not limited to, quantum communication systems)

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