# Enhancing quantum coherence and quantum Fisher information by quantum partially collapsing measurements

Enhancing quantum coherence and quantum Fisher information by quantum partially collapsing... We consider the enhancement effect of quantum partially collapsing measurements, i.e., weak measurement and quantum measurement reversal, on quantum coherence and quantum Fisher information, both of which are transmitted through a spin-chain channel. For the state parameter lying in the region $$(\pi /2,\ \pi )$$ ( π / 2 , π ) , weak measurement can enhance quantum coherence and quantum Fisher information. For the state parameter lying in the region $$(0,\ \pi /2)$$ ( 0 , π / 2 ) , quantum coherence and quantum Fisher information can be enhanced by quantum measurement reversal combined with weak measurement. We assume the probabilistic nature of the method should be responsible for the enhancement. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

# Enhancing quantum coherence and quantum Fisher information by quantum partially collapsing measurements

, Volume 16 (4) – Mar 11, 2017
14 pages

/lp/springer_journal/enhancing-quantum-coherence-and-quantum-fisher-information-by-quantum-8CT3Bt4T4W
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/s11128-017-1561-7
Publisher site
See Article on Publisher Site

### Abstract

We consider the enhancement effect of quantum partially collapsing measurements, i.e., weak measurement and quantum measurement reversal, on quantum coherence and quantum Fisher information, both of which are transmitted through a spin-chain channel. For the state parameter lying in the region $$(\pi /2,\ \pi )$$ ( π / 2 , π ) , weak measurement can enhance quantum coherence and quantum Fisher information. For the state parameter lying in the region $$(0,\ \pi /2)$$ ( 0 , π / 2 ) , quantum coherence and quantum Fisher information can be enhanced by quantum measurement reversal combined with weak measurement. We assume the probabilistic nature of the method should be responsible for the enhancement.

### Journal

Quantum Information ProcessingSpringer Journals

Published: Mar 11, 2017

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