Detailed Information on Publication Record
2000
Optimal manipulations with qubits: Universal quantum entanglers
BŮŽEK, Vladimír and M. HILLERYBasic information
Original name
Optimal manipulations with qubits: Universal quantum entanglers
Authors
BŮŽEK, Vladimír and M. HILLERY
Edition
Physical Review A, USA, American Physical Society, 2000, 1050-2947
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10301 Atomic, molecular and chemical physics
Country of publisher
United States of America
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
Impact factor
Impact factor: 2.831
RIV identification code
RIV/00216224:14330/00:00002892
Organization unit
Faculty of Informatics
UT WoS
000088683400028
Keywords in English
STATES; CLONING; SEPARABILITY; INFORMATION; ENSEMBLES
Tags
Změněno: 21/2/2001 11:32, prof. Dr. phil. Jakub Mácha, Ph.D.
Abstract
V originále
We analyze various scenarios for entangling two initially unentangled qubits. In particular, we propose an optimal universal entangler that entangles a qubit in unknown state \psi] with a qubit in a reference (known) state \0]. That is, our entangler generates the output state that is as close as possible to the pure (symmetrized) state (\psi]\0]+\0]\psi]). The most attractive feature of this entangling machine, is that the fidelity of its performance (i.e., the distance between the output and the ideally entangled-symmetrized state) does not depend on the input and takes the constant value F = (9 + 3 root 2)/14 similar or equal to 0.946. We also analyze how to optimally generate from a single qubit initially prepared in an unknown state \psi]) a two qubit entangled system, which is as close as possible to a Bell state (\psi]\psi(perpendicular to)]+\psi(perpendicular to)]\psi]), where [psi\psi(perpendicular to)] = 0.
Links
| GA201/98/0369, research and development project |
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| MSM 143300001, plan (intention) |
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