Reducing quantum control for spin-spin entanglement distribution

Details Reducing quantum control for spin-spin entanglement distribution Reducing quantum control for spin-spin entanglement distribution

2009-09-04

arxiv.org/abs/0909.0832v2

New J. Phys. 11, 113053 (2009)

Physics

Quantum Physics

7 pages, 5 figures, replaced with published version

Scientific paper

We present a protocol that sets maximum stationary entanglement between remote spins through scattering of mobile mediators without initialization, post-selection or feedback of the mediators' state. No time-resolved tuning is needed and, counterintuitively, the protocol generates two-qubit singlet states even when classical mediators are used. The mechanism responsible for such effect is resilient against non-optimal coupling strengths and dephasing affecting the spins. The scheme uses itinerant particles and scattering centres and can be implemented in various settings. When quantum dots and photons are used a striking result is found: injection of classical mediators, rather than quantum ones, improves the scheme efficiency.

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