Minimizing back-action through entangled measurements
When an observable is measured on an evolving coherent quantum system twice, the first measurement generally alters the statistics of the second one, which is known as measurement back-action. We introduce, and push to its theoretical and experimental limits, a novel method of back-action evasion, w...
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| Abstract | When an observable is measured on an evolving coherent quantum system twice, the first measurement generally alters the statistics of the second one, which is known as measurement back-action. We introduce, and push to its theoretical and experimental limits, a novel method of back-action evasion, whereby entangled collective measurements are performed on several copies of the system. This method is inspired by a similar idea designed for the problem of measuring quantum work [Perarnau-Llobet \textit{et al}., (https://doi.org/10.1103/PhysRevLett.118.070601) Phys. Rev. Lett. \textbf{118}, 070601 (2017)]. By utilizing entanglement as a resource, we show that the back-action can be extremely suppressed compared to all previous schemes. Importantly, the back-action can be eliminated in highly coherent processes. |
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| AbstractList | Phys. Rev. Lett. 125, 210401 (2020) When an observable is measured on an evolving coherent quantum system twice,
the first measurement generally alters the statistics of the second one, which
is known as measurement back-action. We introduce, and push to its theoretical
and experimental limits, a novel method of back-action evasion, whereby
entangled collective measurements are performed on several copies of the
system. This method is inspired by a similar idea designed for the problem of
measuring quantum work [Perarnau-Llobet \textit{et al}.,
(https://doi.org/10.1103/PhysRevLett.118.070601) Phys. Rev. Lett. \textbf{118},
070601 (2017)]. By utilizing entanglement as a resource, we show that the
back-action can be extremely suppressed compared to all previous schemes.
Importantly, the back-action can be eliminated in highly coherent processes. When an observable is measured on an evolving coherent quantum system twice, the first measurement generally alters the statistics of the second one, which is known as measurement back-action. We introduce, and push to its theoretical and experimental limits, a novel method of back-action evasion, whereby entangled collective measurements are performed on several copies of the system. This method is inspired by a similar idea designed for the problem of measuring quantum work [Perarnau-Llobet \textit{et al}., (https://doi.org/10.1103/PhysRevLett.118.070601) Phys. Rev. Lett. \textbf{118}, 070601 (2017)]. By utilizing entanglement as a resource, we show that the back-action can be extremely suppressed compared to all previous schemes. Importantly, the back-action can be eliminated in highly coherent processes. |
| Author | Jun-Feng, Tang Guo, Guang-Can Perarnau-Llobet, Martí Guo-Yong, Xiang Chuan-Feng, Li Hovhannisyan, Karen V Bäumer, Elisa Kang-Da, Wu |
| Author_xml | – sequence: 1 givenname: Wu surname: Kang-Da fullname: Kang-Da, Wu – sequence: 2 givenname: Elisa surname: Bäumer fullname: Bäumer, Elisa – sequence: 3 givenname: Tang surname: Jun-Feng fullname: Jun-Feng, Tang – sequence: 4 givenname: Karen surname: Hovhannisyan middlename: V fullname: Hovhannisyan, Karen V – sequence: 5 givenname: Martí surname: Perarnau-Llobet fullname: Perarnau-Llobet, Martí – sequence: 6 givenname: Xiang surname: Guo-Yong fullname: Guo-Yong, Xiang – sequence: 7 givenname: Li surname: Chuan-Feng fullname: Chuan-Feng, Li – sequence: 8 givenname: Guang-Can surname: Guo fullname: Guo, Guang-Can |
| BackLink | https://doi.org/10.48550/arXiv.2011.09100$$DView paper in arXiv https://doi.org/10.1103/PhysRevLett.125.210401$$DView published paper (Access to full text may be restricted) |
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| DOI | 10.48550/arxiv.2011.09100 |
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| Snippet | When an observable is measured on an evolving coherent quantum system twice, the first measurement generally alters the statistics of the second one, which is... Phys. Rev. Lett. 125, 210401 (2020) When an observable is measured on an evolving coherent quantum system twice, the first measurement generally alters the... |
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| Title | Minimizing back-action through entangled measurements |
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