Faithful conversion of propagating quantum information to mechanical motion

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 sta...

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Bibliographic Details
Published in:arXiv.org 2017-03
Main Authors: Reed, A P, Mayer, K H, Teufel, J D, Burkhart, L D, Pfaff, W, Reagor, M, Sletten, L, X Ma, Schoelkopf, R J, Knill, E, Lehnert, K W
Format: Article
Language:English
Subjects:
Coding
Conversion
Photons
Quantum computing
Quantum phenomena
Quantum theory
Qubits (quantum computing)
Resonators
Online Access:Get full text
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Summary: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 \(F_{\textrm{avg}} = 0.83\substack{+0.03-0.06}\) 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1703.02548