eprintid: 1410660
rev_number: 30
eprint_status: archive
userid: 608
dir: disk0/01/41/06/60
datestamp: 2013-10-21 19:22:16
lastmod: 2021-09-22 22:04:35
status_changed: 2013-10-21 19:22:16
type: article
metadata_visibility: show
item_issues_count: 0
creators_name: Weiss, KM
creators_name: Miguel-Sanchez, J
creators_name: Elzerman, JM
title: Magnetically tunable singlet-triplet spin qubit in a four-electron InGaAs coupled quantum dot
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
keywords: Qubits; Quantum information
note: © 2013 Macmillan Publishers Limited. This work is licensed under a Creative Commons Attribution 3.0 Unported license.
To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0

PubMed ID: 24177037
abstract: A pair of self-assembled InGaAs quantum dots filled with two electrons can act as a singlet-triplet spin qubit
that is robust against nuclear spin fluctuations as well as charge noise. This results in a T2* coherence time
two orders of magnitude longer than that of a single electron, provided the qubit is operated at a particular
‘‘sweet spot’’ in gate voltage. However, at this fixed operating point the ground-state splitting can no longer
be tuned into resonance with e.g. another qubit, limiting the options for coupling multiple qubits. Here, we
propose using a four-electron coupled quantum dot to implement a singlet-triplet qubit that features a
magnetically tunable level splitting. As a first step towards full experimental realization of this qubit design,
we use optical spectroscopy to demonstrate the tunability of the four-electron singlet-triplet splitting in a
moderate magnetic field.
date: 2013-11-01
official_url: http://dx.doi.org/10.1038/srep03121
vfaculties: VMPS
oa_status: green
full_text_type: pub
primo: open
primo_central: open_green
verified: verified_manual
elements_source: WoS-Lite
elements_id: 911431
doi: 10.1038/srep03121
lyricists_name: Elzerman, Jeroen
lyricists_id: JELZE94
full_text_status: public
publication: SCIENTIFIC REPORTS
volume: 3
article_number: ARTN 3121
issn: 2045-2322
citation:        Weiss, KM;    Miguel-Sanchez, J;    Elzerman, JM;      (2013)    Magnetically tunable singlet-triplet spin qubit in a four-electron InGaAs coupled quantum dot.                   SCIENTIFIC REPORTS , 3     , Article ARTN 3121.  10.1038/srep03121 <https://doi.org/10.1038/srep03121>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1410660/1/srep03121.pdf