Phonon-mediated quantum state transfer and remote qubit entanglement

Abstract

Phonons, and in particular surface acoustic wave phonons, have been proposed as a means to coherently couple distant solid-state quantum systems. Recent experiments have shown that superconducting qubits can control and detect individual phonons in a resonant structure, enabling the coherent generation and measurement of complex stationary phonon states. Here, we report the deterministic emission and capture of itinerant surface acoustic wave phonons, enabling the quantum entanglement of two superconducting qubits. Using a 2 mm-long acoustic quantum communication channel, equivalent to a 500 ns delay line, we demonstrate the emission and re-capture of a phonon by one qubit; quantum state transfer between two qubits with a 67\% efficiency; and, by partial transfer of a phonon between two qubits, generation of an entangled Bell pair with a fidelity of ${\mathcal{F}}_B=84\pm 1$ %

16 pages, 7 figures

References in corpus (5)

• Propagating phonons coupled to an artificial atom
• Black-box superconducting circuit quantization
• Demonstrating a Driven Reset Protocol of a Superconducting Qubit
• Coupling a Surface Acoustic Wave to an Electron Spin in diamond via a Dark State
• Qubit-assisted transduction for a detection of surface acoustic waves near the quantum limit

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