Phys Rev Lett. 2006 Jul 28;97(4):040503. doi: 10.1103/PhysRevLett.97.040503. Epub 2006 Jul 27.

Robust entanglement through macroscopic quantum jumps.

Physical review letters

Jeremy Metz, Michael Trupke, Almut Beige

PMID: 16907557 DOI: 10.1103/PhysRevLett.97.040503

Abstract

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 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 is as low as 10 and when using a photon detector with an efficiency as low as eta=0.2.

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• Journal Article