Fidelity and Entanglement of a Spatially Extended Linear Three-Qubit Register

Details Fidelity and Entanglement of a Spatially Extended Linear Three-Qubit Register Fidelity and Entanglement of a Spatially Extended Linear Three-Qubit Register

2008-02-13

arxiv.org/abs/0802.1930v1

Int. J. Quant. Inf. 6, 681 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

We study decoherence of a three-qubit array coupled to substrate phonons. Assuming an initial three-qubit entangled state that would be decoherence-free for identical qubit positions, allows us to focus on non-Markovian effects of the inevitable spatial qubit separation. It turns out that the coherence is most affected when the qubits are regularly spaced. Moreover, we find that up to a constant scaling factor, two-qubit entanglement is not influenced by the presence f the third qubit, even though all qubits interact via the phonon field.

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