Entanglement Sudden Death in a Quantum Memory
arXiv:0904.0956 · doi:10.1103/PhysRevA.80.022310
Abstract
I explore entanglement dynamics in examples of quantum memories, decoherence free subspaces (DFS) and noiseless subsystems (NS), to determine how a complete loss of entanglement affects the ability of these techniques to protect quantum information. Using negativity and concurrence as entanglement measures, I find that in general there is no correlation between the complete loss of entanglement in the system and the fidelity of the stored quantum information. These results complement previous results in which quantum protocols not explictly based on entanglement exhibit little correlation between ESD and the accuracy of the given protocol.
6 pages, 3 composite figures
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Cited by in corpus (5)
- Entanglement Sudden Death in Three Qubit X-States
- Multiparticle entanglement in graph-diagonal states: Necessary and sufficient conditions for four qubits
- Superoperator Analysis of Entanglement in a Four-Qubit Cluster State
- Topology of Entanglement Evolution of Two Qubits
- Entanglement Evolution in a Five Qubit Error Correction Code