A statistical portrait of the entanglement decay of two-qubit memories
| Autor: | Fonseca-Romero, Karen M., Martínez-Rincón, Julián, Viviescas, Carlos |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Physical Review A 86, 042325 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.86.042325 |
| Popis: | We present a novel approach to the study of entanglement decay, which focuses on collective properties. As an example, we investigate the entanglement decay of a two-qubit system, produced by local identical reservoirs acting on the qubits, for three experimentally and theoretically relevant cases. We study the probability distributions of disentanglement times, a quantity independent of the measure used to quantify entanglement, and the time-dependent probability distribution of concurrence. Analytical results are obtained for initially uniformly distributed pure states. The calculation of these probability distributions gives a complete insight on how different decoherence channels affect the entanglement initially contained in the set of two-qubit pure states. Numerical results are reported for randomly distributed initial mixed states. Although the paper focuses in Markovian noisy channels, we show that our results also describe non-autonomous and non-Markovian channels. Comment: 8 pages, 7 figures |
| Databáze: | arXiv |
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