Qubit state guidance without feedback

Details Qubit state guidance without feedback Qubit state guidance without feedback

2004-10-04

arxiv.org/abs/quant-ph/0410026v1

New J. Phys. 7, 43 (2005).

Physics

Quantum Physics

7 pages, 6 figures, RevTeX4

Scientific paper

10.1088/1367-2630/7/1/043

We study a protocol for two-qubit state guidance that does not rely on feedback mechanisms. In our scheme, entanglement can be concentrated by arranging the interactions of the qubits with a continuous variable ancilla. By properly post-selecting the outcomes of repeated measurements of the state of the ancilla, the qubit state is driven to have a desired amount of purity and entanglement. We stress the primary role played by the first iterations of the protocol. Inefficiencies in the detection operations can be fully taken into account.

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