|Instituto de Ciencia de Materiales de Madrid|
|Condensed Matter Theory|
|Sigmund Kohler||home | cv | research | publications|
Fidelity and entanglement of a spatially extended linear three-qubit registerRoland Doll, Martijn Wubs, Sigmund Kohler, and Peter Hänggi
Int. J. Quantum Inf. 6, 681 (2008)
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 of the third qubit, even though all qubits interact via the phonon field.
[Condensed Matter Theory]
last modified: 18.6.2018 by Sigmund Kohler