Faithful conversion of propagating quantum information to mechanical motion

2017/03/07 by A. P. Reed, Adam Reed, Karl Mayer +18 · 4 citations
Computer Science · Physics and Astronomy · #Density matrix #Force Microscopy Techniques and Applications #Mechanical and Optical Resonators #Optics #Photon #Physics #Quantum #Quantum Information and Cryptography #Quantum information #Quantum mechanics #Quantum optics #Quantum state #Quantum tomography #Qubit #Resonator #cond-mat.supr-con #quant-ph

paper · pdf · doi:10.1038/nphys4251

22 pages, 14 figures (including Supplementary Information)

arxiv created 2017/03/07 · openalex publication_date 2017/09/11 · arxiv updated 2018/01/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We convert propagating qubits encoded as superpositions of zero and one photons to the motion of a micrometer-sized mechanical resonator. Using quantum state tomography, we determine the density matrix of both the propagating photons and the mechanical resonator. By comparing a sufficient set of states before and after conversion, we determine the average process fidelity to be F_\textrmavg = 0.83\substack+0.03-0.06 which exceeds the classical bound for the conversion of an arbitrary qubit state. This conversion ability is necessary for using mechanical resonators in emerging quantum communication and modular quantum computation architectures.

Citations

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Cited by

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• Large flux-mediated coupling in hybrid electromechanical system with a transmon qubit
• Non-Gaussian Quantum States and Where to Find Them
• High-fidelity bosonic quantum state transfer using imperfect transducers and interference