# Purifying two-qubit entanglement in nonidentical decoherence by employing weak measurements

Purifying two-qubit entanglement in nonidentical decoherence by employing weak measurements In this paper, we propose a feasible scheme for purifying two-qubit entanglement in the presence of decoherence by employing weak measurements. As long as the entanglement parameter $$\alpha$$ α and the measurement strength $$p$$ p satisfy a certain condition, we can always achieve the purification without reference to the initial state. Furthermore, an arbitrary initial state can be directly purified into the maximally entangled state by setting measurement strength $$p=1-\frac{\left| \alpha \right| }{\sqrt{1-\left| \alpha \right| ^{2}}}$$ p = 1 - α 1 - α 2 . The success probability of our scheme not only depends on measurement strength, but also closely links to the initial state. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

# Purifying two-qubit entanglement in nonidentical decoherence by employing weak measurements

, Volume 14 (4) – Jan 23, 2015
11 pages

1

/lp/springer_journal/purifying-two-qubit-entanglement-in-nonidentical-decoherence-by-ZgZageryhD
Publisher
Springer Journals
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-015-0918-z
Publisher site
See Article on Publisher Site

### Abstract

In this paper, we propose a feasible scheme for purifying two-qubit entanglement in the presence of decoherence by employing weak measurements. As long as the entanglement parameter $$\alpha$$ α and the measurement strength $$p$$ p satisfy a certain condition, we can always achieve the purification without reference to the initial state. Furthermore, an arbitrary initial state can be directly purified into the maximally entangled state by setting measurement strength $$p=1-\frac{\left| \alpha \right| }{\sqrt{1-\left| \alpha \right| ^{2}}}$$ p = 1 - α 1 - α 2 . The success probability of our scheme not only depends on measurement strength, but also closely links to the initial state.

### Journal

Quantum Information ProcessingSpringer Journals

Published: Jan 23, 2015

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