Demonstration of deterministic SWAP gate between superconducting and frequency-encoded microwave-photon qubits

• URL: http://arxiv.org/abs/2302.04548v1
• Date: Thu, 9 Feb 2023 10:27:16 GMT
• Title: Demonstration of deterministic SWAP gate between superconducting and frequency-encoded microwave-photon qubits
• Authors: Kazuki Koshino and Kunihiro Inomata
• Abstract summary: We show a SWAP gate between the superconducting-atom and microwave-photon qubits. We confirm the bidirectional quantum state transfer between the atom and photon qubits. The present atom-photon gate, equipped with an in situ tunability of the gate type, would enable various applications in distributed quantum computation.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The number of superconducting qubits contained in a single quantum processor is increasing steadily. However, to realize a truly useful quantum computer, it is inevitable to increase the number of qubits much further by distributing quantum information among distant processors using flying qubits. Here, we demonstrate a key element towards this goal, namely, a SWAP gate between the superconducting-atom and microwave-photon qubits. The working principle of this gate is the single-photon Raman interaction, which results from strong interference in one-dimensional optical systems and enables a high gate fidelity insensitively to the pulse shape of the photon qubit, by simply bouncing the photon qubit at a cavity attached to the atom qubit. We confirm the bidirectional quantum state transfer between the atom and photon qubits. The averaged fidelity of the photon-to-atom (atom-to-photon) state transfer reaches 0.829 (0.801), limited mainly by the energy relaxation time of the atom qubit. The present atom-photon gate, equipped with an in situ tunability of the gate type, would enable various applications in distributed quantum computation using superconducting qubits and microwave photons.

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