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Variational-state quantum metrology
| Content Provider | Scilit |
|---|---|
| Author | Koczor, Bálint Endo, Suguru Jones, Tyson Matsuzaki, Yuichiro Benjamin, Simon C. |
| Copyright Year | 2020 |
| Description | Journal: New Journal of Physics Quantum technologies exploit entanglement to enhance various tasks beyond their classical limits including computation, communication and measurements. Quantum metrology aims to increase the precision of a measured quantity that is estimated in the presence of statistical errors using entangled quantum states. We present a novel approach for finding (near) optimal states for metrology in the presence of noise, using variational techniques as a tool for efficiently searching the high-dimensional space of quantum states, which would be classically intractable. We comprehensively explore systems consisting of up to 9 qubits and find new highly entangled states that are not symmetric under permutations and non-trivially outperform previously known states up to a constant factor 2. We consider a range of environmental noise models; while passive quantum states cannot achieve a fundamentally superior scaling (as established by prior asymptotic results) we do observe a significant absolute quantum advantage. We finally outline a possible experimental setup for variational quantum metrology which can be implemented in near-term hardware. |
| Related Links | https://iopscience.iop.org/article/10.1088/1367-2630/ab965e/pdf |
| e-ISSN | 13672630 |
| DOI | 10.1088/1367-2630/ab965e |
| Journal | New Journal of Physics |
| Issue Number | 8 |
| Volume Number | 22 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2020-05-26 |
| Access Restriction | Open |
| Subject Keyword | Journal: New Journal of Physics Mathematical Physics Quantum States Quantum Metrology |
| Content Type | Text |
| Resource Type | Article |
