Robust Entanglement through Macroscopic Quantum Jumps

Details Robust Entanglement through Macroscopic Quantum Jumps Robust Entanglement through Macroscopic Quantum Jumps

2005-10-07

arxiv.org/abs/quant-ph/0510051v3

Phys. Rev. Lett. 97, 040503 (2006).

Physics

Quantum Physics

5 pages, 4 figures, more detailed discussion of underlying physical effect, references updated

Scientific paper

10.1103/PhysRevLett.97.040503

We propose an entanglement generation scheme that requires neither the coherent evolution of a quantum system nor the detection of single photons. Instead, the desired state is heralded by a {\em macroscopic} quantum jump. Macroscopic quantum jumps manifest themselves as a random telegraph signal with long intervals of intense fluorescence (light periods) interrupted by the complete absence of photons (dark periods). Here we show that a system of two atoms trapped inside an optical cavity can be designed such that a dark period prepares the atoms in a maximally entangled ground state. Achieving fidelities above 0.9 is possible even when the single-atom cooperativity parameter C is as low as 10 and when using a photon detector with an efficiency as low as eta = 0.2.

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