CN214544336U

CN214544336U - APD bias voltage output device for quantum communication equipment

Info

Publication number: CN214544336U
Application number: CN202122250898.6U
Authority: CN
Inventors: 张国峰; 劳卫伦; 王嘉延; 万相奎
Original assignee: Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd; Guokaike Quantum Technology Beijing Co Ltd
Current assignee: Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd; Guokaike Quantum Technology Beijing Co Ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2021-10-29
Anticipated expiration: 2031-09-17

Abstract

The utility model provides a APD bias voltage output device for quantum communication equipment, APD bias voltage output device includes: the digital potentiometers are respectively and electrically connected to a corresponding single-photon detector in the single-photon detectors in the quantum communication equipment; the LT3966 four-channel boosting driver comprises four boosting channels, wherein part of or all of the four boosting channels are electrically connected to a corresponding one of a plurality of digital potentiometers; and the programmable controller is used for outputting corresponding APD bias voltage to each single-photon detector in the plurality of single-photon detectors through a digital potentiometer electrically connected with part of or all of the four boosting channels so as to detect the received optical pulse signals. The utility model discloses not only can further simplify the structure of the circuit board among the quantum communication equipment, but also can make quantum communication equipment's volume more miniaturized.

Description

APD bias voltage output device for quantum communication equipment

Technical Field

The utility model relates to a quantum communication technology field especially relates to an APD bias voltage output device for quantum communication equipment.

Background

Currently, in a quantum communication system (such as a quantum key distribution system), a TPS61391 boost converter is generally adopted to output an APD bias voltage to a single photon detector in a quantum communication device. However, since such a boost converter can only output one APD bias voltage, it is necessary to configure a corresponding TPS61391 boost converter for each single photon detector used in the quantum communication device, which not only complicates the structure of the circuit board in the quantum communication device, but also increases the volume of the quantum communication device.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an APD bias voltage output device for quantum communication equipment.

According to an aspect of the present invention, there is provided an APD bias voltage output device for a quantum communication apparatus, the bias voltage output device including: a plurality of digital potentiometers electrically connected to a corresponding one of a plurality of single-photon detectors in the quantum communication device, respectively; the LT3966 four-channel boosting driver comprises four boosting channels, wherein part of or all of the four boosting channels are electrically connected to corresponding one of the digital potentiometers; and the programmable controller is electrically connected to the LT3966 four-channel boosting driver, so that a digital potentiometer electrically connected with part of or all of the four boosting channels can output corresponding APD bias voltage to each single-photon detector in the plurality of single-photon detectors respectively, and optical pulse signals received by the quantum communication equipment can be detected.

Preferably, the quantum communication device is a receiving end of a quantum communication system based on time phase coding.

Preferably, the plurality of single photon detectors comprises a single photon detector for detecting phase encoding, a single photon detector for detecting time encoding and a single photon detector for detecting a system encoding clock.

Preferably, the programmable controller is an FPGA.

The utility model provides a APD bias voltage output device for quantum communication equipment can export multichannel APD bias voltage simultaneously, to the quantum communication equipment including a plurality of single photon detectors (such as, but not limited to, quantum communication system's based on time phase code receiving terminal), not only can further simplify the structure of the circuit board among the quantum communication equipment like this, and the cost is realized to the reduce system, but also can make quantum communication equipment's volume more miniaturized.

Drawings

The above objects and features of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings.

Fig. 1 shows a schematic diagram of the APD bias voltage output device for quantum communication equipment outputting APD bias voltages to a plurality of single photon detectors according to the present invention.

Fig. 2 shows a schematic circuit diagram of the digital potentiometer electrically connected to one of the four boosting channels of the LT3966 four-channel boosting driver, for outputting APD bias voltage to one of the single photon detectors of the plurality of single photon detectors, according to the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, the APD bias voltage output apparatus for quantum communication devices of the present invention may include at least a plurality of digital potentiometers 110, LT3966 four-channel boost drivers 120, and a programmable controller 130 (such as, but not limited to, an FPGA).

In the bias voltage output apparatus shown in fig. 1, the plurality of digital potentiometers 110 may be respectively electrically connected to a corresponding one of the plurality of single-photon detectors 140 in the quantum communication device; the LT3966 four-channel boost driver 120 may include four boost channels, which may be respectively electrically connected to a corresponding one of the plurality of digital potentiometers 110; the programmable controller 130 may be electrically connected to the LT3966 four-channel boost driver 120 to output a respective APD bias voltage V0 to each of the plurality of single photon detectors 140 through digital potentiometers electrically connected in the four boost channels to detect the optical pulse signals received by the quantum communication device.

It should be understood that, although fig. 1 shows the schematic diagram of the APD bias voltage output device for quantum communication equipment outputting the APD bias voltage to the plurality of single photon detectors, the present invention is not limited thereto, and the present invention discloses an APD bias voltage output device for quantum communication equipment can also output the APD bias voltage to the part of the plurality of single photon detectors (for example, two or three single photon detectors) via the digital potentiometer electrically connected to the part of the four boosting channels (for example, two or three boosting channels) according to the requirement.

In addition, in the bias voltage output apparatus shown in fig. 1, the quantum communication device may be a receiving end of a quantum communication system based on time phase encoding. Accordingly, the plurality of single photon detectors 140 shown in FIG. 1 may include single photon detectors X0 and X1 for detecting phase encoding, single photon detector Z for detecting time encoding, and single photon detector Syn for detecting system encoding clocks.

Referring to fig. 2, under the action of the switching signal output from the SW1 of the LT3966 four-channel boost driver 120, the inductor L1, the diode D1 and the capacitor C1 may generate a high voltage, and the LT3966 four-channel boost driver 120 may collect the generated high voltage through the resistor networks R1, R2 and R3 electrically connected to its pins ISP1 and ISN1 and transmit the generated high voltage to the programmable controller 130 through the IIC bus. Programmable controller 130 may adjust digital potentiometer 110-1 via the SPI bus based on the received high voltage to adjust the magnitude of the high voltage. Subsequently, the LT3966 four-channel boost driver 120 may output a control signal to the MOS transistor G1 via its pin TG1 to output the APD bias voltage V0 to the single photon detector.

Similarly, the APD bias voltage V0 can be output simultaneously to other single photon detectors in a plurality of single photon detections using the circuit schematic shown in figure 2.

The APD bias voltage output device shown in fig. 1 can simultaneously output multiple APD bias voltages, and for a quantum communication device (such as, but not limited to, a receiving end of a quantum communication system based on time phase coding) including multiple single photon detectors, this not only can further simplify the structure of a circuit board in the quantum communication device and reduce the system implementation cost, but also can further miniaturize the volume of the quantum communication device.

While the present application has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made to these embodiments without departing from the spirit and scope of the present application as defined by the following claims.

Claims

1. An APD bias voltage output apparatus for a quantum communication device, comprising:

a plurality of digital potentiometers electrically connected to a corresponding one of a plurality of single-photon detectors in the quantum communication device, respectively;

the LT3966 four-channel boosting driver comprises four boosting channels, wherein part of or all of the four boosting channels are electrically connected to corresponding one of the digital potentiometers; and

and the programmable controller is electrically connected to the LT3966 four-channel boosting driver so as to output corresponding APD bias voltage to each single-photon detector in the plurality of single-photon detectors through a digital potentiometer electrically connected with part of or all of the four boosting channels respectively, so as to detect the optical pulse signals received by the quantum communication equipment.

2. The bias voltage output apparatus according to claim 1, wherein the quantum communication device is a receiving end of a quantum communication system based on time phase encoding.

3. The bias voltage output device according to claim 2, wherein the plurality of single photon detectors include a single photon detector for detecting phase encoding, a single photon detector for detecting time encoding, and a single photon detector for detecting a system encoding clock.

4. The bias voltage output device according to claim 1, wherein the programmable controller is an FPGA.