Modular construction of special mixed quantum states |
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Authors: | Email author" target="_blank">M?MichelEmail author G?Mahler |
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Institution: | (1) Institute of Theoretical Physics I, University of Stuttgart, Pfaffenwaldring 57, 7, 0550 Stuttgart, Germany |
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Abstract: | For a homogeneous quantum network of N subsystems with n levels each we consider separable generalized Werner states. A generalized Werner state is defined as a mixture of the totally mixed state and an arbitrary pure state
:
with a mixture coefficient
. For this density operator
to be separable,
will have an upper bound
. Below this bound one should alternatively be able to reproduce
by a mixture of entirely separable input-states. For this purpose we introduce a set of modules, each contributing elementary coherence properties with respect to a generalized coherence vector. Based on these there exists a general step-by-step mixing process for any
. For
being a cat-state it is possible to define an optimal process, which produces states right up to the separability boundary (
).Received: 3 December 2002, Published online: 29 July 2003PACS:
03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell s inequalities, GHZ states, etc.) - 03.67.-a Quantum information - 03.65.-w Quantum mechanics |
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Keywords: | |
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