Implementation of a fast optical Schrödinger-cat source

Hector Simon; Lucas Caron; Romaric Journet; Rosa Tualle-Brouri

doi:10.1117/12.3017533

6 June 2024 Implementation of a fast optical Schrödinger-cat source

Hector Simon, Lucas Caron, Romaric Journet, Rosa Tualle-Brouri

Proceedings Volume PC12993, Quantum Technologies 2024; PC129930P (2024) https://doi.org/10.1117/12.3017533
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

“Schrödinger Cat States” (SCS), which are coherent superpositions of two dephased coherent states, have been proven to be valuable resources for quantum computing, quantum communication, and quantum metrology. In this work, we present an experimental implementation of a SCS source using an iterative scheme. We use a heralded photon source based on parametric down conversion and a quantum memory cavity. The latter consists of a low losses cavity comprising a fast Pockels cell and a Polarizing Beam Splitter (PBS), allowing us to store a first single photon, waiting for a second one to be generated. We then entangle the stored photon and the incoming photon using the PBS and the Pockels cell to perform polarization manipulation. A homodyne detection then performs a quadrature measurement on one part of the entangled state. This is conditioning measurement: if the result is “X=0”, then the other part of the state is projected on a SCS. A first version of the experiment allowed us to generate SCS at a rate of 100 Hz with a fidelity of 47% after a 184ns long storage.

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Hector Simon, Lucas Caron, Romaric Journet, and Rosa Tualle-Brouri "Implementation of a fast optical Schrödinger-cat source", Proc. SPIE PC12993, Quantum Technologies 2024, PC129930P (6 June 2024); https://doi.org/10.1117/12.3017533

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