dorsal/arxiv
View SchemaEntanglement properties of multipartite entangled states under the influence of decoherence
| Authors | M. Hein, W. Dür, H. -J. Briegel |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0408165 |
| URL | https://arxiv.org/abs/quant-ph/0408165 |
| DOI | 10.1103/PhysRevA.71.032350 |
| Journal | Phys. Rev. A 71, 032350 (2005) |
Abstract
We investigate entanglement properties of multipartite states under the influence of decoherence. We show that the lifetime of (distillable) entanglement for GHZ-type superposition states decreases with the size of the system, while for a class of other states -namely all graph states with constant degree- the lifetime is independent of the system size. We show that these results are largely independent of the specific decoherence model and are in particular valid for all models which deal with individual couplings of particles to independent environments, described by some quantum optical master equation of Lindblad form. For GHZ states, we derive analytic expressions for the lifetime of distillable entanglement and determine when the state becomes fully separable. For all graph states, we derive lower and upper bounds on the lifetime of entanglement. To this aim, we establish a method to calculate the spectrum of the partial transposition for all mixed states which are diagonal in a graph state basis. We also consider entanglement between different groups of particles and determine the corresponding lifetimes as well as the change of the kind of entanglement with time. This enables us to investigate the behavior of entanglement under re-scaling and in the limit of large (infinite) number of particles. Finally we investigate the lifetime of encoded quantum superposition states and show that one can define an effective time in the encoded system which can be orders of magnitude smaller than the physical time. This provides an alternative view on quantum error correction and examples of states whose lifetime of entanglement (between groups of particles) in fact increases with the size of the system.
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"abstract": "We investigate entanglement properties of multipartite states under the\ninfluence of decoherence. We show that the lifetime of (distillable)\nentanglement for GHZ-type superposition states decreases with the size of the\nsystem, while for a class of other states -namely all graph states with\nconstant degree- the lifetime is independent of the system size. We show that\nthese results are largely independent of the specific decoherence model and are\nin particular valid for all models which deal with individual couplings of\nparticles to independent environments, described by some quantum optical master\nequation of Lindblad form. For GHZ states, we derive analytic expressions for\nthe lifetime of distillable entanglement and determine when the state becomes\nfully separable. For all graph states, we derive lower and upper bounds on the\nlifetime of entanglement. To this aim, we establish a method to calculate the\nspectrum of the partial transposition for all mixed states which are diagonal\nin a graph state basis. We also consider entanglement between different groups\nof particles and determine the corresponding lifetimes as well as the change of\nthe kind of entanglement with time. This enables us to investigate the behavior\nof entanglement under re-scaling and in the limit of large (infinite) number of\nparticles. Finally we investigate the lifetime of encoded quantum superposition\nstates and show that one can define an effective time in the encoded system\nwhich can be orders of magnitude smaller than the physical time. This provides\nan alternative view on quantum error correction and examples of states whose\nlifetime of entanglement (between groups of particles) in fact increases with\nthe size of the system.",
"arxiv_id": "quant-ph/0408165",
"authors": [
"M. Hein",
"W. D\u00fcr",
"H. -J. Briegel"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.71.032350",
"journal_ref": "Phys. Rev. A 71, 032350 (2005)",
"title": "Entanglement properties of multipartite entangled states under the influence of decoherence",
"url": "https://arxiv.org/abs/quant-ph/0408165"
},
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