Entangled-state cycles from conditional quantum evolution

Details Entangled-state cycles from conditional quantum evolution Entangled-state cycles from conditional quantum evolution

2006-02-09

arxiv.org/abs/quant-ph/0602083v1

Physics

Quantum Physics

12 pages, 10 figures

Scientific paper

10.1103/PhysRevA.73.043813

A system of cascaded qubits interacting via the oneway exchange of photons is studied. While for general operating conditions the system evolves to a superposition of Bell states (a dark state) in the long-time limit, under a particular resonance condition no steady state is reached within a finite time. We analyze the conditional quantum evolution (quantum trajectories) to characterize the asymptotic behavior under this resonance condition. A distinct bimodality is observed: for perfect qubit coupling, the system either evolves to a maximally entangled Bell state without emitting photons (the dark state), or executes a sustained entangled-state cycle - random switching between a pair of Bell states while emitting a continuous photon stream; for imperfect coupling, two entangled-state cycles coexist, between which a random selection is made from one quantum trajectory to another.

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