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Quantum system ground state energy estimation method and system

A technology for energy estimation and quantum state, applied in the quantum field, can solve problems such as weak expression ability and affecting the accuracy of ground state energy estimation

Active Publication Date: 2021-09-10
TENCENT TECH (SHENZHEN) CO LTD
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Problems solved by technology

[0004] However, although the Jastrow factor is more suitable for describing many-body associations, it is still not the most common form that classical postprocessing can have, so its expressive ability is weak, which will affect the accuracy of ground state energy estimation

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Embodiment Construction

[0028] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0029] Before introducing the technical solution of this application, some key terms involved in this application will be explained first.

[0030] 1. Quantum computing: Based on quantum logic computing, the basic unit of data storage is the quantum bit (qubit).

[0031] 2. Qubit: The basic unit of quantum computing. Traditional computers use 0 and 1 as the basic units of binary. The difference is that quantum computing can process 0 and 1 at the same time, and the system can be in a linear superposition state of 0 and 1: |ψ>=α|0>+β|1>, here α, β represent the system on 0 and 1 Complex probability amplitudes. Their modular square |α| 2 , |β| 2 are probabilities of 0 and 1, respectively.

[0032] 3. Quantum circuit: A repres...

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Abstract

The invention discloses a quantum system ground state energy estimation method and system, and relates to the technical field of quantum. According to the invention, the wave function output by the PQC is post-processed by adopting the neural network, the neural network can play a role of a general function approximator, and compared with a Jastrow factor, the neural network has higher expression ability and ground state energy approximation ability, so that improvement of the accuracy of ground state energy estimation is facilitated. Moreover, the measurement circuit is added after the PQC, the measurement circuit is used for executing the transformation processing corresponding to the Fouli character string on the output quantum state of the PQC, the transformed output quantum state is obtained, and the resource consumption in the measurement estimation process can be reduced through the transformation, so that under the consumption of polynomial resources, measurement and unbiased estimation of the Fouli character string and even the general Hamiltonian are completed.

Description

technical field [0001] The embodiments of the present application relate to the field of quantum technology, and in particular to a method and system for estimating the ground state energy of a quantum system. Background technique [0002] At present, a VQE (Variational Quantum Eigensolver, Variational Quantum Eigensolver) scheme is proposed to estimate the ground state energy of the quantum system. VQE realizes the ground state energy estimation of the quantum system through the variable quantum circuit, which is a typical quantum-classical hybrid computing paradigm. [0003] In order to further enhance the output performance of the VQE and improve the accuracy of the ground state energy estimation, a related technology proposes a scheme of using the Jastrow factor as a post-processing enhancement of the VQE. By using the Jastrow factor to post-process the wave function output by the variable quantum circuit in VQE, in order to describe more quantum entanglement and correl...

Claims

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Application Information

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IPC IPC(8): G06N10/00
CPCG06N10/00G06N10/60G06N10/70G06N3/084G06N10/20
Inventor 张士欣万周全张胜誉
Owner TENCENT TECH (SHENZHEN) CO LTD
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