Reducing quantum control for spin-spin entanglement distribution

Abstract

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.

7 pages, 5 figures, replaced with published version

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• Distillation by repeated measurements: continuous spectrum case
• Entanglement-assisted tomography of a quantum target
• Entanglement Generation and Stabilization by Coherent Collisions
• Selective writing and read-out of a register of static qubits
• Interaction between hopping and static spins in a discrete network