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A waveguide component, unequal arm Mach-Zehnder interferometer and parameter determination method

A waveguide and component technology, applied in the field of arm Mach-Zehnder interferometers and parameter determination, which can solve problems such as the effect of qubit encoding or decoding

Active Publication Date: 2020-10-27
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the effective refractive index of the waveguide changes with temperature, if the temperature of the chip changes, the long and short light pulses will also experience different phase changes, and the phase change caused by the temperature change will affect the qubit. encoding or decoding affect

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  • A waveguide component, unequal arm Mach-Zehnder interferometer and parameter determination method
  • A waveguide component, unequal arm Mach-Zehnder interferometer and parameter determination method
  • A waveguide component, unequal arm Mach-Zehnder interferometer and parameter determination method

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Embodiment Construction

[0043] The embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

[0044] Quantum communication refers to the technology of transmitting, exchanging and analyzing qubits (the basic computing unit of quantum information) in different network nodes. One of its main applications is quantum encryption (quantum cryptography), also known as quantum key distribution (quantum key distribution, QKD). Based on the theory of quantum entanglement, OKD can provide unconditionally secure shared keys for users separated by two places. It is an encryption method with extremely high security performance.

[0045] Time-bin encoding is currently the most widely used encoding form of QKD, and it is usually realized by using an asymmetric mach-zehnder interferometer (AMZI). Specifically, a single photon can take two long and short paths in AMZI at the same time (the long path is called the long arm, and the sho...

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Abstract

The embodiment of the invention discloses a waveguide assembly, an unequal-arm Mach-Zehnder interferometer and a parameter determination method. The waveguide assembly comprises a long-arm waveguide and a short-arm waveguide; the long arm waveguide is connected with the short arm waveguide; the long arm waveguide and the short arm waveguide meet a first preset condition, wherein the first preset condition is that a first product is equal to a second product, the first product is the product between a thermo-optical coefficient of the long-arm waveguide and an arm length of the long-arm waveguide, and the second product is the product between a thermo-optical coefficient of the short-arm waveguide and an arm length of the short-arm waveguide. According to the waveguide assembly provided bythe invention, the influence of temperature change on encoding or decoding of quantum bits can be avoided.

Description

technical field [0001] The present application relates to the field of communication technology, and in particular to a waveguide component, a scalene Mach-Zehnder interferometer and a parameter determination method. Background technique [0002] Quantum communication refers to the technology of transmitting, exchanging and analyzing qubits (the basic calculation unit of quantum information) in different network nodes. One of the main applications of quantum communication is quantum encryption (quantum cryptography), also known as quantum key distribution (quantum key distribution, QKD). The security of QKD is based on the most fundamental laws of physics, the laws of quantum mechanics, which provide "unconditional security" for key distribution. [0003] When the qubit is transmitted in the waveguide, the qubit can be encoded based on different dimensions, such as the polarization of the photon, the orbital angular momentum, and the arrival time. Among them, the time-bin ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/12G02B6/122H04B10/70
CPCG02B6/12004G02B6/122G02B2006/12159H04B10/70
Inventor 耿巍张超
Owner HUAWEI TECH CO LTD