期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.120503
关键词
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资金
- U.S. Department of Energy [DEAC05-00OR22725]
- U.S. Department of Energy, Office of Science (Office of Advanced Scientific Computing Research, Early Career Research Program)
- U.S. Department of Energy, Office of Science (Office of Workforce Development for Teachers and Scientists Science Undergraduate Laboratory Internship Program)
- National Science Foundation [1839191-ECCS]
Accurate control of two-level systems is a longstanding problem in quantum mechanics. One such quantum system is the frequency-bin qubit: a single photon existing in superposition of two discrete frequency modes. In this Letter, we demonstrate fully arbitrary control of frequency-bin qubits in a quantum frequency processor for the first time. We numerically establish optimal settings for multiple configurations of electro-optic phase modulators and pulse shapers, experimentally confirming near-unity mode-transformation fidelity for all fundamental rotations. Performance at the single-photon level is validated through the rotation of a single frequency-bin qubit to 41 points spread over the entire Bloch sphere, as well as tracking of the state path followed by the output of a tunable frequency beam splitter, with Bayesian tomography confirming state fidelities F-rho > 0.98 for all cases. Such high-fidelity transformations expand the practical potential of frequency encoding in quantum communications, offering exceptional precision and low noise in general qubit manipulation.
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