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- W2210492059 abstract "Entanglement purification allows the creation of qubit pairs of arbitrarily high fidelity with respect to a maximally entangled state, starting from a larger number of low-fidelity pairs. Purification requires quantum memory, a role for which electron spins are well suited. However, using existing recurrence protocols involving symmetric local two-qubit operations for spin qubits turns out to be rather unpractical. We present an efficient purification protocol requiring only a single pulsed Heisenberg- or XY-type exchange interaction between two qubit pairs. In contrast to known protocols, we allow for asymmetric bilateral two-qubit operations where the two communication parties operate differently on their qubits. In the optimal version of our protocol, the local two-qubit interactions in the case of Heisenberg exchange correspond to the $sqrt{swap}$ gate and its inverse." @default.
- W2210492059 created "2016-06-24" @default.
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- W2210492059 date "2014-08-20" @default.
- W2210492059 modified "2023-09-24" @default.
- W2210492059 title "Entanglement purification with the exchange interaction" @default.
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- W2210492059 doi "https://doi.org/10.1103/physreva.90.022320" @default.
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