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Accessing continuous-variable entanglement witnesses with multimode spin observables

par Griffet, Célia ;Haas, Tobias;Cerf, Nicolas
Référence Physical Review A, 108, 2, 022421
Publication Publié, 2023-08-01

Article révisé par les pairs

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Résumé :

We present several measurement schemes for accessing separability criteria for continuous-variable bipartite quantum systems. Starting from moments of the bosonic mode operators, criteria suitable to witness entanglement are expressed in terms of multimode spin observables via the Jordan-Schwinger map. These observables are typically defined over a few replicas of the state of interest and can be transformed into simple photon number measurements by passive optical circuits. Our measurement schemes require only a handful of measurements, thereby allowing one to efficiently detect entanglement without the need for costly state tomography as illustrated for a variety of physically relevant states (Gaussian, mixed Schrödinger cat, and NOON states). The influence of typical experimental imperfections is shown to be moderate.