Quantum state encoding device, quantum state encoding method and quantum processor

Abstract

The invention provides a quantum state encoding device, a quantum state encoding method and a quantum processor. The device comprises a quantum bit structure (1) and an encoding module (2). N potential wells are arranged in a phase space, a first potential well is the potential well with the lowest energy in the N potential wells, M quantum states exist in the first potential well, N is an integerlarger than 0, and M is an integer larger than 1. The encoding module uses the first quantum state and a second quantum state as logic bits for encoding, and the first quantum state and the second quantum state are two quantum states with the lowest energy in the M quantum states. Two quantum states with the lowest energy in a potential well with the lowest energy are used for encoding, the control speed is higher, the influence of magnetic flux noise is not likely to happen, the phase decoherence time is longer, control is easy, and multi-bit coupling is convenient to achieve.

Description

technical field [0001] The present disclosure relates to the technical field of quantum computers, and in particular, to a quantum state encoding device, method and quantum processor. Background technique [0002] Quantum computers are devices that encode and compute information using quantum states. Compared with traditional computers, the computing efficiency of quantum computers has been improved exponentially, and it has great potential in solving complex problems. Thanks to the support of modern micro-nano processing technology, superconducting quantum computing is easy to achieve large-scale integration, and has become the fastest-growing method at present. [0003] Superconducting qubits are actually encoded using the quantum states of superconducting circuits. Among related technologies, Transmon qubit is the most widely used. However, in order to reduce the influence of the charge noise, the anharmonicity of the bit is reduced, which leads to the limitation of th...

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Problems solved by technology

However, in order to reduce the influence of charge noise, it reduces the anharmonicity of the bit, which limits the speed of bit manipulation.

Another kind of qubit is the Fluxonium bit, which is a qubit structure formed by connecting an inductance composed of a large Josephson junction array in parallel with a small Josephson junction, and uses the ground state quantum states in different potential wells in the phase space for encoding. It is not affected by charge noise, but it is sensitive to flux noise, the phase decoherence time is short, and it is not easy to control, so it has not been substantially applied

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