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Incomplete pure dephasing of N-qubit entangled W states
| Content Provider | Semantic Scholar |
|---|---|
| Author | Doll, Roland Wubs, Martijn Hänggi, Peter Kohler, Sigmund |
| Copyright Year | 2007 |
| Abstract | 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 exact 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 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. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.physik.uni-augsburg.de/theo1/hanggi/Papers/468.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Bloch sphere Causal filter Dephasing Error detection and correction Quantum decoherence Quantum error correction Qubit W state newton |
| Content Type | Text |
| Resource Type | Article |
