Quantum-dot single-photon sources for entanglement enhanced interferometry
Abstract
Multiphoton entangled states such as “N00N states” have attracted a lot of attention because of their possible application in high-precision, quantum enhanced phase determination. So far, N00N states have been generated in spontaneous parametric down-conversion processes and by mixing quantum and classical light on a beam splitter. Here, in contrast, we demonstrate superresolving phase measurements based on two-photon N00N states generated by quantum dot single-photon sources making use of the Hong-Ou-Mandel effect on a beam splitter. By means of pulsed resonance fluorescence of a charged exciton state, we achieve, in postselection, a quantum enhanced improvement of the precision in phase uncertainty, higher than prescribed by the standard quantum limit. An analytical description of the measurement scheme is provided, reflecting requirements, capability, and restraints of single-photon emitters in optical quantum metrology. Our results point toward the realization of a real-world quantum sensor in the near future.
Citation
Müller , M , Vural , H , Schneider , C , Rastelli , A , Schmidt , O G , Höfling , S & Michler , P 2017 , ' Quantum-dot single-photon sources for entanglement enhanced interferometry ' , Physical Review Letters , vol. 118 , no. 25 , 257402 . https://doi.org/10.1103/PhysRevLett.118.257402
Publication
Physical Review Letters
Status
Peer reviewed
ISSN
0031-9007Type
Journal article
Rights
© 2017 American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1103/PhysRevLett.118.257402 © 2017 American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1103/PhysRevLett.118.257402
Description
The authors acknowledge financial support from the Center for Integrated Quantum Science and Technology (IQST).Collections
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.