Full Bell-basis measurement of an atom-photon 2-qubit state and its application for quantum networks

• URL: http://arxiv.org/abs/2301.06091v4
• Date: Mon, 20 Nov 2023 23:29:04 GMT
• Title: Full Bell-basis measurement of an atom-photon 2-qubit state and its application for quantum networks
• Authors: Elena Arensk\"otter, Stephan Kucera, Omar Elshehy, Max Bergerhoff, Matthias Kreis, L\'eandre Brunel, J\"urgen Eschner
• Abstract summary: We present the implementation of a protocol that allows us to distinguish all four Bell states by the use of a single-ion quantum memory. First we demonstrate the state-preserving mapping of a photonic qubit onto the quantum memory, verified by the preservation of entanglement. Then we demonstrate the full Bell state projection between a memory qubit and an incoming photonic qubit, by applying it for atom-to-photon quantum state teleportation.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The efficiency of a Bell-state measurement on photon pairs is bound to 50\,\% due to the number of Bell states that can be distinguished using linear optics. Here we present the implementation of a protocol that allows us to distinguish all four Bell states by the use of a single-ion quantum memory and heralded absorption as state-selective measurement. The protocol is implemented in two steps. First we demonstrate the state-preserving mapping of a photonic qubit onto the quantum memory, verified by the preservation of entanglement in the process. Then we demonstrate the full Bell state projection between a memory qubit and an incoming photonic qubit, by applying it for atom-to-photon quantum state teleportation.

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