Power of one bit of quantum information in quantum metrology

We present a model of quantum metrology inspired by the computational model known as deterministic quantum computation with one quantum bit (DQC1). Using only one pure qubit together with l fully mixed qubits we obtain measurement precision (defined as root-mean-square error for the parameter being...

Full description

Saved in:
Bibliographic Details
Main Authors: Cable, Hugo, Gu, Mile, Modi, Kavan
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2018
Subjects:
Online Access:https://hdl.handle.net/10356/87796
http://hdl.handle.net/10220/46857
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-87796
record_format dspace
spelling sg-ntu-dr.10356-877962023-02-28T19:35:00Z Power of one bit of quantum information in quantum metrology Cable, Hugo Gu, Mile Modi, Kavan School of Physical and Mathematical Sciences Complexity Institute Quantum Metrology DRNTU::Science::Physics Quantum Information We present a model of quantum metrology inspired by the computational model known as deterministic quantum computation with one quantum bit (DQC1). Using only one pure qubit together with l fully mixed qubits we obtain measurement precision (defined as root-mean-square error for the parameter being estimated) at the standard quantum limit, which is typically obtained using the same number of uncorrelated qubits in fully pure states. In principle, the standard quantum limit can be exceeded using an additional qubit which adds only a small amount of purity. We show that the discord in the final state vanishes only in the limit of attaining infinite precision for the parameter being estimated. NRF (Natl Research Foundation, S’pore) Published version 2018-12-07T01:49:50Z 2019-12-06T16:49:38Z 2018-12-07T01:49:50Z 2019-12-06T16:49:38Z 2016 Journal Article Cable, H., Gu, M., & Modi, K. (2016). Power of one bit of quantum information in quantum metrology. Physical Review A, 93(4), 040304(R)-. doi:10.1103/PhysRevA.93.040304 2469-9926 https://hdl.handle.net/10356/87796 http://hdl.handle.net/10220/46857 10.1103/PhysRevA.93.040304 en Physical Review A © 2016 American Physical Society (APS). This paper was published in Physical Review A and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: [http://dx.doi.org/10.1103/PhysRevA.93.040304]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 5 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Quantum Metrology
DRNTU::Science::Physics
Quantum Information
spellingShingle Quantum Metrology
DRNTU::Science::Physics
Quantum Information
Cable, Hugo
Gu, Mile
Modi, Kavan
Power of one bit of quantum information in quantum metrology
description We present a model of quantum metrology inspired by the computational model known as deterministic quantum computation with one quantum bit (DQC1). Using only one pure qubit together with l fully mixed qubits we obtain measurement precision (defined as root-mean-square error for the parameter being estimated) at the standard quantum limit, which is typically obtained using the same number of uncorrelated qubits in fully pure states. In principle, the standard quantum limit can be exceeded using an additional qubit which adds only a small amount of purity. We show that the discord in the final state vanishes only in the limit of attaining infinite precision for the parameter being estimated.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Cable, Hugo
Gu, Mile
Modi, Kavan
format Article
author Cable, Hugo
Gu, Mile
Modi, Kavan
author_sort Cable, Hugo
title Power of one bit of quantum information in quantum metrology
title_short Power of one bit of quantum information in quantum metrology
title_full Power of one bit of quantum information in quantum metrology
title_fullStr Power of one bit of quantum information in quantum metrology
title_full_unstemmed Power of one bit of quantum information in quantum metrology
title_sort power of one bit of quantum information in quantum metrology
publishDate 2018
url https://hdl.handle.net/10356/87796
http://hdl.handle.net/10220/46857
_version_ 1759858151885111296