Probabilistic implementation of a nonlocal operation using a nonmaximally entangled state
- Zhejiang Insitute of Modern Physics, Zhejiang University, Hangzhou 310027 (China)
We develop the probabilistic implementation of a nonlocal gate exp[i{xi}{sigma}{sub n{sub A}}{sigma}{sub n{sub B}}] and {xi} set-membership sign [0,({pi}/4)], by using a single nonmaximally entangled state. We prove that nonlocal gates can be implemented with a fidelity of >79.3% and a consumption of <0.969 ebits and two classical bits, when {xi}{<=}0.353. This provides a higher bound for the feasible operation compared to the former techniques. Besides, gates with {xi}{>=}0.353 can be implemented with the probability 79.3% and a consumption of 0.969 ebits, which is the same efficiency as the distillation-based protocol, while our method saves extra classical resources. Gates with {xi}{yields}0 can be implemented with nearly unit probability and a small entanglement. We also generalize some applications to the multiple system, where we find it is possible to implement certain nonlocal gates between many nonentangled partners using a nonmaximally multiple entangled state.
- OSTI ID:
- 20717825
- Journal Information:
- Physical Review. A, Vol. 71, Issue 5; Other Information: DOI: 10.1103/PhysRevA.71.054302; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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