Optimal manipulations with qubits: Universal quantum entanglers

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14330%2F00%3A00002892" target="_blank" >RIV/00216224:14330/00:00002892 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Optimal manipulations with qubits: Universal quantum entanglers
Original language description
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 ]. That is, our entangler generates the output state that is as close as possible to the pure (symmetrized) state (psi]]+]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 [psipsi(perpendicular to)] = 0.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BE - Theoretical physics
OECD FORD branch
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Project
<a href="/en/project/GA201%2F98%2F0369" target="_blank" >GA201/98/0369: Informatics as the third methodology</a><br>
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2000
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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