Fully Arbitrary Control of Frequency-Bin Qubits

• URL: http://arxiv.org/abs/2008.07444v1
• Date: Mon, 17 Aug 2020 16:06:16 GMT
• Title: Fully Arbitrary Control of Frequency-Bin Qubits
• Authors: Hsuan-Hao Lu, Emma M. Simmerman, Pavel Lougovski, Andrew M. Weiner, Joseph M. Lukens
• Abstract summary: We numerically establish optimal settings for multiple configurations of electro-optic phase modulators and pulse shapers. Performance at the single-photon level is validated through the rotation of a single frequency-bin qubit to 41 points spread over the Bloch sphere.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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. %and a potential building block for scalable, fiber-compatible quantum information processing. In this work, 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 beamsplitter, with Bayesian tomography confirming state fidelities $\mathcal{F}_\rho>0.98$ 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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