Deterministic Free-Propagating Photonic Qubits with Negative Wigner Functions

• URL: http://arxiv.org/abs/2209.02047v1
• Date: Mon, 5 Sep 2022 16:37:42 GMT
• Title: Deterministic Free-Propagating Photonic Qubits with Negative Wigner Functions
• Authors: Valentin Magro, Julien Vaneecloo, S\'ebastien Garcia, and Alexei Ourjoumtsev
• Abstract summary: Coherent states ubiquitous in classical and quantum communications, squeezed states used in quantum sensing, and even highly-entangled states studied in the context of quantum computing can be produced deterministically. We describe the first fully deterministic preparation of non-Gaussian Wigner-negative states of light, obtained by mapping the internal state of an intracavdberg superatom onto an optical qubit.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Engineering quantum states of free-propagating light is of paramount importance for quantum technologies. Coherent states ubiquitous in classical and quantum communications, squeezed states used in quantum sensing, and even highly-entangled cluster states studied in the context of quantum computing can be produced deterministically, but they obey quasi-classical optical field statistics described by Gaussian, positive Wigner functions. Fully harnessing the potential of many quantum engineering protocols requires using non-Gaussian Wigner-negative states, so far produced using intrinsically probabilistic methods. Here we describe the first fully deterministic preparation of non-Gaussian Wigner-negative free-propagating states of light, obtained by mapping the internal state of an intracavity Rydberg superatom onto an optical qubit encoded as a superposition of 0 and 1 photons. This approach allows us to reach a 60% photon generation efficiency in a well-controlled spatio-temporal mode, while maintaining a strong photon antibunching. By changing the qubit rotation angle, we observe an evolution from quadrature squeezing to Wigner negativity. Our experiment sets this new technique as a viable method to deterministically generate non-Gaussian photonic resources, lifting several major roadblocks in optical quantum engineering.

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