Volume 91, Number 1, July 2010
|Number of page(s)||5|
|Published online||22 July 2010|
Coherent control of long-distance steady-state entanglement in lossy resonator arrays
Centre for Quantum Technologies, National University of Singapore - 2 Science Drive 3, Singapore 117542
2 Science Department, Technical University of Crete - 73100, Chania, Crete, Greece, EU
3 Department of Physics, National University of Singapore - 2 Science Drive 3, Singapore 117542
4 National Institute of Education and Institute of Advanced Studies, Nanyang Technological University - 1 Nanyang Walk, Singapore 637616
Accepted: 22 June 2010
We show that coherent control of the steady-state long-distance entanglement between pairs of cavity-atom systems in an array of lossy and driven coupled resonators is possible. The cavities are doped with atoms and are connected through waveguides, other cavities or fibers depending on the implementation. We find that the steady-state entanglement can be coherently controlled through the tuning of the phase difference between the driving fields. It can also be surprisingly high in spite of the pumps being classical fields. For some implementations where the connecting element can be a fiber, long-distance steady-state quantum correlations can be established. Furthermore, the maximal of entanglement for any pair is achieved when their corresponding direct coupling is much smaller than their individual couplings to the third party. This effect is reminiscent of the establishment of coherence between otherwise uncoupled atomic levels using classical coherent fields. We suggest a method to measure this entanglement by analyzing the correlations of the emitted photons from the array and also analyze the above results for a range of values of the system parameters, different network geometries and possible implementation technologies.
PACS: 03.67.Bg – Entanglement production and manipulation / 03.67.Hk – Quantum communication / 03.67.Lx – Quantum computation architectures and implementations
© EPLA, 2010
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