4 March 2015 Qubits, qutrits, and ququads stored in single photons from an atom-cavity system
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One of today’s challenge to realize computing based on quantum mechanics is to reliably and scalably encode information in quantum systems. Here, we present a photon source to on-demand deliver photonic quantum bits of information based on a strongly coupled atom-cavity system. It operates intermittently for periods of up to 100μs, with a single-photon repetition rate of 1MHz, and an intra-cavity production e!ciency of up to 85%. Due to the photons inherent coherence time of 500ns and our ability to arbitrarily shape their amplitude and phase profile we time-bin encode information within one photon. To do so, the spatio-temporal envelope of a single photon is sub-divided in d time bins which allows for the delivery of arbitrary qu-d-its. The latter is done with a fidelity of > 95% for qubits, and 94% for qutrits verified using a newly developed time-resolved quantum-homodyne technique.
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Annemarie Holleczek, Annemarie Holleczek, Oliver Barter, Oliver Barter, Gunnar Langfahl-Klabes, Gunnar Langfahl-Klabes, Axel Kuhn, Axel Kuhn, "Qubits, qutrits, and ququads stored in single photons from an atom-cavity system", Proc. SPIE 9377, Advances in Photonics of Quantum Computing, Memory, and Communication VIII, 937709 (4 March 2015); doi: 10.1117/12.2085548; https://doi.org/10.1117/12.2085548

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