Sudden death of effective entanglement
arXiv:0912.1330 · doi:10.1103/PhysRevA.81.042308
Abstract
Sudden death of entanglement is a well-known effect resulting from the finite volume of separable states. We study the case when the observer has a limited measurement capability and analyse the effective entanglement, i.e. entanglement minimized over the output data. We show that in the well defined system of two quantum dots monitored by single electron transistors, one may observe a sudden death of effective entanglement when real, physical entanglement is still alive. For certain measurement setups, this occurs even for initial states for which sudden death of physical entanglement is not possible at all. The principles of the analysis may be applied to other analogous scenarios, such as etimation of the parameters arising from quantum process tomography.
final version, 5 pages, 3 figures
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- Quantum to classical transition and entanglement sudden death in Gaussian states under local heat bath dynamics
- Topology of Entanglement Evolution of Two Qubits
- A measure of qubit environment entanglement for pure dephasing evolutions
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