Optimal entanglement generation from quantum operations

Journal Article · Wed Jan 01 00:00:00 EST 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.67.012306· OSTI ID:20634084

Leifer, M S; Henderson, L; Linden, N ^[1]

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1. Department of Mathematics, University of Bristol, University Walk, Bristol, BS8 1TW (United Kingdom)

We consider how much entanglement can be produced by a nonlocal two-qubit unitary operation, U{sub AB}--the entangling capacity of U{sub AB}. For a single application of U{sub AB}, with no ancillas, we find the entangling capacity and show that it generally helps to act with U{sub AB} on an entangled state. Allowing ancillas, we present numerical results from which we can conclude, quite generally, that allowing initial entanglement typically increases the optimal capacity in this case as well. Next, we show that allowing collective processing does not increase the entangling capacity if initial entanglement is allowed.

• OSTI ID: 20634084
• Journal Information: Physical Review. A, Vol. 67, Issue 1; Other Information: DOI: 10.1103/PhysRevA.67.012306; (c) 2003 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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