Incomplete pure dephasing of N-qubit entangled W states

Details Incomplete pure dephasing of N-qubit entangled W states Incomplete pure dephasing of N-qubit entangled W states

2007-03-02

arxiv.org/abs/cond-mat/0703075v3

Phys. Rev. B 76, 045317 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 6 figures, revised version, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.045317

We consider qubits in a linear arrangement coupled to a bosonic field which acts as a quantum heat bath and causes decoherence. By taking the spatial separation of the qubits explicitly into account, the reduced qubit dynamics acquires an additional non-Markovian element. We investigate the time evolution of an entangled many-qubit W state, which for vanishing qubit separation remains robust under pure dephasing. For finite separation, by contrast, the dynamics is no longer decoherence-free. On the other hand, spatial noise correlations may prevent a complete dephasing. While a standard Bloch-Redfield master equation fails to describe this behavior even qualitatively, we propose instead a widely applicable causal master equation. Here we employ it to identify and characterize decoherence-poor subspaces. Consequences for quantum error correction are discussed.

Affiliated with

Also associated with

No associations

Rating

Incomplete pure dephasing of N-qubit entangled W states does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Incomplete pure dephasing of N-qubit entangled W states, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Incomplete pure dephasing of N-qubit entangled W states will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-284458