Quantum system control method and device

Abstract

The embodiment of the invention provides a quantum system control method and device. The method comprises the steps of determining a non-decoherence subspace, evolved corresponding to decoherence noise, of a quantum system; determining a target evolution matrix of the quantum system in the non-decoherence subspace; and according to a preset control optimization objective function, updating control parameters of the quantum system, so that a system evolution matrix obtained based on the updated control parameters approaches a target evolution matrix, and a space in which a quantum state obtained based on the updated control parameters is located approaches a non-decoherent subspace.

Description

technical field [0001] The invention relates to the field of quantum computing, in particular to a quantum system control method and device. Background technique [0002] As the far-reaching significance and wide application prospects of building quantum computers are increasingly recognized, the human demand for building a universal quantum computer is becoming more and more urgent. With the research of superconducting qubits, ion traps, cold atoms, linear optics, nitrogen vacancy defect color centers, nuclear magnetic resonance and other systems, more and more quantum systems, namely qubit systems, can be built at present. However, realizing high-fidelity quantum logic gates remains a central problem. [0003] In order to overcome the impact of environmental noise and manipulation errors on quantum manipulation, a series of technologies have been developed, such as optimal control technology and general computing technology on decoherence protection subspace. However, th...

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Problems solved by technology

In the optimal control technology, quantum logic gates can only obtain high fidelity in quasi-static noise, and are not robust to environmental noise with different coherence lengths; Bit manipulation errors are not robust

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