Abstract: The invention relates to the technical field of mechanical vibration measurement, and discloses a device for accurately measuring mechanical vibration by photon counter. The device comprises a laser, an optical isolator, an adjustable attenuator, an optical fiber coupler, a single-photon counter and an FPGA post-processing module, wherein the laser enters the optical fiber coupler after passing through the optical isolator and the adjustable attenuator, and then enters into a measured object. The transmitted signal of the object to be measured returns to the optical fiber coupler and is output to the single-photon counter; the mechanical vibration of the measured object is analysed and obtained by the FPGA post-processing module connecting with the output terminal of the single-photon counter.

Abstract: The invention relates to the technical field of mechanical vibration measurement, and discloses a device for accurately measuring mechanical vibration by photon counter. The device comprises a laser, an optical isolator, an adjustable attenuator, an optical fiber coupler, a single-photon counter and an FPGA post-processing module, wherein the laser enters the optical fiber coupler after passing through the optical isolator and the adjustable attenuator, and then enters into a measured object. The transmitted signal of the object to be measured returns to the optical fiber coupler and is output to the single-photon counter; the mechanical vibration of the measured object is analysed and obtained by the FPGA post-processing module connecting with the output terminal of the single-photon counter.

Abstract: A bottleneck in the continuous-variable quantum random number generation rate is mainly as follows: low quantum entropy content in actual quantum measurement on quantum entropy source, and low real-time post-processing rate in extraction of true random numbers. Therefore, the present disclosure aims to provide a method of real-time high-speed quantum random number generation based on chaos amplifying quantum noise, to greatly increase the quantum entropy content through the chaos amplifying quantum noise, perform parallel implementation of universal Hash post-processing of multichannel quantum random numbers, and implement real-time high-speed quantum random number generation.

Abstract: Disclosed is a front-and-rear split door (9) and an electric vehicle having the split door (9), the front-and-rear split door (9) comprises a front compartment door (901) and a rear compartment door (902) configured to open or close a passenger compartment (101), wherein the front compartment door (901) and the rear compartment door (902) are provided above the passenger compartment (101); a front end of the front compartment door (901) is connected to a vehicle body (1) via a first hinge assembly (903), a rear end of the rear compartment door (902) is connected to the vehicle body (1) via a second hinge assembly (904); and the electric vehicle further comprises a first turning mechanism (905) configured to control the front compartment door (901) to turn outwardly about the first hinge assembly (903) and a second turning mechanism (906) configured to control the rear compartment door (902) to turn outwardly about the second hinge assembly (904).

Abstract: Disclosed is a front-and-rear split door (9) and an electric vehicle having the split door (9), the front-and-rear split door (9) comprises a front compartment door (901) and a rear compartment door (902) configured to open or close a passenger compartment (101), wherein the front compartment door (901) and the rear compartment door (902) are provided above the passenger compartment (101); a front end of the front compartment door (901) is connected to a vehicle body (1) via a first hinge assembly (903), a rear end of the rear compartment door (902) is connected to the vehicle body (1) via a second hinge assembly (904); and the electric vehicle further comprises a first turning mechanism (905) configured to control the front compartment door (901) to turn outwardly about the first hinge assembly (903) and a second turning mechanism (906) configured to control the rear compartment door (902) to turn outwardly about the second hinge assembly (904).