Entanglement generation and stabilization by coherent collisions
A.M. Bozkurt (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Wimmer Group, Kavli institute of nanoscience Delft)
Rosa López (Instituto de Física Interdisciplinar y Sistemas Complejos IFISC (CSIC-UIB))
Sungguen Ryu (Instituto de Física Interdisciplinar y Sistemas Complejos IFISC (CSIC-UIB))
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Abstract
Collision is a useful tool for revealing quantum effects and realizing quantum informational tasks. We demonstrate that repeated collisions by itinerant electrons can dissipatively drive two remote spin qubits into an entangled state in a generic collisional framework. A coherent spin exchange with either qubit facilitates entanglement generation. When combined with proper local driving, these collisions induce an entangled steady state in most collision configurations. Particularly, the collision which is symmetric for the two qubits results in a unique steady state close to a maximally entangled state. Due to the dissipative nature of the process, the entanglement persists in the presence of decoherence, provided the collision frequency exceeds the decoherence rate. Our model can be experimentally implemented using single-electron sources.
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