Huang, Z., Macchiavello, C., Maccone, L. et al. (1 more author) (2020) Ancilla-assisted schemes are beneficial for Gaussian state phase estimation. Physical Review A, 101 (1). ISSN 2469-9926
Abstract
We study interferometry with Gaussian states and show that an ancilla-assisted scheme outperforms coherent state interferometry for all levels of loss. We also compare the ancilla-assisted scheme to other interferometric schemes involving squeezing, and show that it has the most advantage in the high-loss, high photon-number regime. In fact, in the presence of high loss, it outperforms many other strategies proposed to date. We find the optimal measurement observable for each scheme discussed. We also find that, with the appropriate measurement, the achievable precision of the proposal by Caves [Phys. Rev. D 23, 1693 (1981)] can be improved upon, and is less vulnerable to losses than previously thought.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 American Physical Society. Reproduced in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Funding Information: | Funder Grant number Engineering and Physical Science Research Council EP/M013472/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 14 Feb 2020 09:30 |
Last Modified: | 16 Feb 2020 22:43 |
Status: | Published |
Publisher: | American Physical Society |
Refereed: | Yes |
Identification Number: | 10.1103/physreva.101.012124 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:157017 |