eprintid: 1455694
rev_number: 33
eprint_status: archive
userid: 608
dir: disk0/01/45/56/94
datestamp: 2014-11-13 01:30:03
lastmod: 2021-12-13 02:28:48
status_changed: 2016-04-15 14:21:27
type: article
metadata_visibility: show
item_issues_count: 0
creators_name: Genoni, MG
creators_name: Mancini, S
creators_name: Wiseman, HM
creators_name: Serafini, A
title: Quantum filtering of a thermal master equation with a purified reservoir
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F60
note: Copyright © 2014 American Physical Society.
abstract: We consider a system subject to a quantum optical master equation at finite temperature and study a class of conditional dynamics obtained by monitoring its totally or partially purified environment. More specifically, drawing from the notion that the thermal state of the environment may be regarded as the local state of a lossy and noisy two-mode squeezed state, we consider conditional dynamics (“unravellings”) resulting from the homodyne detection of the two modes of such a state. Thus, we identify a class of unravellings parametrized by the loss rate suffered by the environmental two-mode state, which interpolate between direct detection of the environmental mode alone (occurring for total loss, whereby no correlation between the two environmental modes is left) and full access to the purification of the bath (occurring when no loss is acting and the two-mode state of the environment is pure). We hence show that, while direct detection of the bath is not able to reach the maximal steady-state squeezing allowed by general-dyne unravellings, such optimal values can be obtained when a fully purified bath is accessible. More generally we show that, within our framework, any degree of access to the bath purification improves the performance of filtering protocols in terms of achievable squeezing and entanglement.
date: 2014-12
official_url: http://dx.doi.org/10.1103/PhysRevA.90.063826
vfaculties: VMPS
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_source: WoS-Lite
elements_id: 992946
doi: 10.1103/PhysRevA.90.063826
lyricists_name: Genoni, Marco
lyricists_name: Serafini, Alessio
lyricists_id: MGGEN60
lyricists_id: ASERA90
full_text_status: public
publication: Physical Review A
volume: 90
number: 6
article_number: 063826
issn: 1050-2947
citation:        Genoni, MG;    Mancini, S;    Wiseman, HM;    Serafini, A;      (2014)    Quantum filtering of a thermal master equation with a purified reservoir.                   Physical Review A , 90  (6)    , Article 063826.  10.1103/PhysRevA.90.063826 <https://doi.org/10.1103/PhysRevA.90.063826>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1455694/1/Quantum%20filtering%20of%20a%20thermal%20master%20equation%20with%20a%20purified%20reservoir.pdf