Entanglement purification without controlled-NOT gates by using the natural dynamics of spin chains

Details Entanglement purification without controlled-NOT gates by using the natural dynamics of spin chains Entanglement purification without controlled-NOT gates by using the natural dynamics of spin chains

2008-02-19

arxiv.org/abs/0802.2588v2

Phys. Rev. A 78, 022312 (2008)

Physics

Quantum Physics

4 figures

Scientific paper

10.1103/PhysRevA.78.022312

We present a simple protocol to purify bipartite entanglement in spin-1/2 particles by utilizing only natural spin-spin interactions, i.e. those that can commonly be realized in realistic physical systems, and S_z-measurements on single spins. Even the standard isotropic Heisenberg interaction is shown to be sufficient to purify mixed state entanglement if there are at least three pairs of spins. This approach could be useful for quantum information processing in solid-state-based systems.

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