Detection of continuous variable entanglement without coherent local oscillators

Physics – Quantum Physics

Scientific paper

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7 Pages, 4 Figures

Scientific paper

10.1103/PhysRevA.78.060104

We propose three criteria for identifying continuous variable entanglement between two many-particle systems with no restrictions on the quantum state of the local oscillators used in the measurements. Mistakenly asserting a coherent state for the local oscillator can lead to incorrectly identifying the presence of entanglement. We demonstrate this in simulations with 100 particles, and also find that large number fluctuations do not prevent the observation of entanglement. Our results are important for quantum information experiments with realistic Bose-Einstein condensates or in optics with arbitrary photon states.

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