Finite-time disentanglement via spontaneous emission.

We show that under the influence of pure vacuum noise two entangled qubits become completely disentangled in a finite-time, and in a specific example we find the time to be given by ln((2+sqrt[2] / 2) times the usual spontaneous lifetime.

[1]  W. Zurek.  Pointer Basis of Quantum Apparatus: Into What Mixture Does the Wave Packet Collapse? , 1981 .

[2]  W. Zurek.  Environment-induced superselection rules , 1982 .

[3]  K. Kraus,et al.  States, effects, and operations : fundamental notions of quantum theory : lectures in mathematical physics at the University of Texas at Austin , 1983 .

[4]  E. Joos,et al.  The emergence of classical properties through interaction with the environment , 1985 .

[5]  W. Zurek.  Preferred States, Predictability, Classicality and the Environment-Induced Decoherence , 1993 .

[6]  N. Gisin.  Hidden quantum nonlocality revealed by local filters , 1996 .

[7]  W. Wootters,et al.  Entanglement of a Pair of Quantum Bits , 1997, quant-ph/9703041.

[8]  W. Wootters.  Entanglement of Formation of an Arbitrary State of Two Qubits , 1997, quant-ph/9709029.

[9]  John Preskill,et al.  Lecture notes on quantum information and quantum computation~ http://www , 1998 .

[10]  Seth Lloyd,et al.  Universal Control of Decoupled Quantum Systems , 1999 .

[11]  P. Knight,et al.  Proposal for teleportation of an atomic state via cavity decay , 1999, quant-ph/9908004.

[12]  I. Chuang,et al.  Quantum Computation and Quantum Information: Introduction to the Tenth Anniversary Edition , 2010 .

[13]  B. Hu,et al.  Two-Level Atom-Field Interaction: Exact Master Equations for Non-Markovian Dynamics, Decoherence and Relaxation , 1999, quant-ph/9901078.

[14]  Knight,et al.  Quantum computing using dissipation to remain in a decoherence-free subspace , 2000, Physical review letters.

[15]  F. Haake,et al.  Universality of decoherence. , 2000, Physical review letters.

[16]  K. Wódkiewicz,et al.  Stochastic decoherence of qubits. , 2001, Optics express.

[17]  K. Wódkiewicz,et al.  Quantum Markov channels for qubits , 2002, quant-ph/0211001.

[18]  Disentanglement by dissipative open system dynamics , 2003, quant-ph/0312099.

[19]  Jonathan J. Halliwell,et al.  Disentanglement and decoherence by open system dynamics , 2004 .

[20]  Krzysztof Wódkiewicz,et al.  Depolarizing channel as a completely positive map with memory , 2004 .