Time-optimal universal quantum gates on superconducting circuits

• URL: http://arxiv.org/abs/2301.03334v2
• Date: Tue, 24 Oct 2023 03:17:22 GMT
• Title: Time-optimal universal quantum gates on superconducting circuits
• Authors: Ze Li, Ming-Jie Liang, Zheng-Yuan Xue
• Abstract summary: We propose a scheme to realize universal quantum gates on superconducting qubits in a two-dimensional square lattice configuration. In order to reduce the influence of the dephasing error, decoherence-free subspace encoding is also incorporated in our physical implementation.
• Score: 1.5512702032483539
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Decoherence is inevitable when manipulating quantum systems. It decreases the quality of quantum manipulations and thus is one of the main obstacles for large-scale quantum computation, where high-fidelity quantum gates are needed. Generally, the longer a gate operation is, the more decoherence-induced gate infidelity will be. Therefore, how to shorten the gate time becomes an urgent problem to be solved. To this end, time-optimal control based on solving the quantum brachistochrone equation is a straightforward solution. Here, based on time-optimal control, we propose a scheme to realize universal quantum gates on superconducting qubits in a two-dimensional square lattice configuration, and the two-qubit gate fidelity approaches 99.9\%. Meanwhile, we can further accelerate the Z-axis gate considerably by adjusting the detuning of the external driving. Finally, in order to reduce the influence of the dephasing error, decoherence-free subspace encoding is also incorporated in our physical implementation. Therefore, we present a fast quantum scheme which is promising for large-scale quantum computation.

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