Quantum measurement encoding for quantum metrology
Preserving the precision of the parameter of interest in the presence of environmental decoherence is an important yet challenging task in dissipative quantum sensing. In this work, we study quantum metrology when the decoherence effect is unraveled by a set of quantum measurements, dubbed quantum m...
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| Format: | Article |
| Language: | English |
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American Physical Society
2024-11-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.6.043084 |
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| author | Jing Yang |
| author_facet | Jing Yang |
| author_sort | Jing Yang |
| collection | DOAJ |
| description | Preserving the precision of the parameter of interest in the presence of environmental decoherence is an important yet challenging task in dissipative quantum sensing. In this work, we study quantum metrology when the decoherence effect is unraveled by a set of quantum measurements, dubbed quantum measurement encoding. In our case, the estimation parameter is encoded into a quantum state through a quantum measurement, unlike the parameter encoding through a unitary channel in the decoherence-free case or trace-preserving quantum channels in the case of decoherence. We identify conditions for a precision-preserving measurement encoding. These conditions can be employed to transfer metrological information from one subsystem to another through quantum measurements. Furthermore, postselected non-Hermitian sensing can also be viewed as quantum sensing with measurement encoding. When the precision-preserving conditions are violated in non-Hermitian sensing, we derive a universal formula for the loss of precision. |
| format | Article |
| id | doaj-art-b4ec2c628eb3459898f332c62b0fd965 |
| institution | OA Journals |
| issn | 2643-1564 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj-art-b4ec2c628eb3459898f332c62b0fd9652025-08-20T02:18:36ZengAmerican Physical SocietyPhysical Review Research2643-15642024-11-016404308410.1103/PhysRevResearch.6.043084Quantum measurement encoding for quantum metrologyJing YangPreserving the precision of the parameter of interest in the presence of environmental decoherence is an important yet challenging task in dissipative quantum sensing. In this work, we study quantum metrology when the decoherence effect is unraveled by a set of quantum measurements, dubbed quantum measurement encoding. In our case, the estimation parameter is encoded into a quantum state through a quantum measurement, unlike the parameter encoding through a unitary channel in the decoherence-free case or trace-preserving quantum channels in the case of decoherence. We identify conditions for a precision-preserving measurement encoding. These conditions can be employed to transfer metrological information from one subsystem to another through quantum measurements. Furthermore, postselected non-Hermitian sensing can also be viewed as quantum sensing with measurement encoding. When the precision-preserving conditions are violated in non-Hermitian sensing, we derive a universal formula for the loss of precision.http://doi.org/10.1103/PhysRevResearch.6.043084 |
| spellingShingle | Jing Yang Quantum measurement encoding for quantum metrology Physical Review Research |
| title | Quantum measurement encoding for quantum metrology |
| title_full | Quantum measurement encoding for quantum metrology |
| title_fullStr | Quantum measurement encoding for quantum metrology |
| title_full_unstemmed | Quantum measurement encoding for quantum metrology |
| title_short | Quantum measurement encoding for quantum metrology |
| title_sort | quantum measurement encoding for quantum metrology |
| url | http://doi.org/10.1103/PhysRevResearch.6.043084 |
| work_keys_str_mv | AT jingyang quantummeasurementencodingforquantummetrology |