Entanglement generation by interaction with semiclassical radiation
- Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem IL-91904 (Israel)
We address a fundamental issue in quantum mechanics and quantum information theory--the generation of an entangled pair of qubits that interact solely through a third, semiclassical degree of freedom--in the framework of cavity quantum electrodynamics. We show that finite, although not maximal, entanglement is obtainable in the classical limit, at the price of a diverging effective interaction time. The optimal atomic entanglement derives from a trade-off between the atomic entanglement in a sub-wave packet and the purity of the atomic state. Decoherence by photon loss sets an upper limit on the degree of excitation of the cavity mode, beyond which the achievable entanglement decreases as the inverse mean photon number to the sixth power.
- OSTI ID:
- 22093472
- Journal Information:
- Physical Review. A, Vol. 84, Issue 5; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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