| Issue |
EPL
Volume 82, Number 6, June 2008
|
|
|---|---|---|
| Article Number | 60003 | |
| Number of page(s) | 4 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/82/60003 | |
| Published online | 30 May 2008 | |
Entanglement witness measurement for two-qubit states by optical interference
1
Key Laboratory of Quantum Information, University of Science and Technology of China, CAS Hefei 230026, PRC
2
Department of Physics, Southeast University - Nanjing 211189, PRC
Corresponding author: hyf@ustc.edu.cn
Received:
10
March
2008
Accepted:
22
April
2008
We present a novel interferometer to directly implement entanglement witness measurement. This is optimal and avoids the complex task to decompose witness into local projectors. The interferometer is based on a hybrid realization of controlled-SWAP gate. We also demonstrate entanglement-witness for simple cases experimentally.
PACS: 03.67.Mn – Entanglement measures, witnesses, and other characterizations / 42.50.Dv – Quantum states engineering and measurements / 42.65.Lm – Parametric down conversion and production of entangled photons
© EPLA, 2008
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