|
| related topics |
| {state, states, entangled} |
| {entanglement, phys, rev} |
| {time, decoherence, evolution} |
| {information, entropy, channel} |
| {qubit, qubits, gate} |
| {bell, inequality, local} |
| {state, states, coherent} |
| {measurement, state, measurements} |
| {alice, bob, state} |
| {force, casimir, field} |
|
Robustness of Multi-Party Entanglement
Christoph Simon, Julia Kempe
abstract: How common is large-scale entanglement in nature? As a first step towards
addressing this question, we study the robustness of multi-party entanglement
under local decoherence, modeled by partially depolarizing channels acting
independently on each subsystem. Surprisingly, we find that n-qubit GHZ
entanglement can stand more than 55 % local depolarization in the limit of n
going to infinity, and that GHZ states are more robust than other generic
states of 3 and 4 qubits. We also study spin-squeezed states in the limit n
going to infinity and find that they too can stand considerable local
depolarization.
- oai_identifier:
- oai:arXiv.org:quant-ph/0109102
- categories:
- quant-ph
- comments:
- 4 pages
- doi:
- 10.1103/PhysRevA.65.052327
- arxiv_id:
- quant-ph/0109102
- journal_ref:
- Phys. Rev. A, Vol. 65 (5), 052327 (2002)
- created:
- 2001-09-20
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