Quantum non-Hermitian topological sensors
We investigate in the framework of quantum noise theory how the striking boundary sensitivity recently discovered in the context of non-Hermitian (NH) topological phases may be harnessed to devise novel quantum sensors. Specifically, we study a quantum-optical setting of coupled modes arranged in an...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2022-02-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.4.013113 |
| _version_ | 1797210811108687872 |
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| author | Florian Koch Jan Carl Budich |
| author_facet | Florian Koch Jan Carl Budich |
| author_sort | Florian Koch |
| collection | DOAJ |
| description | We investigate in the framework of quantum noise theory how the striking boundary sensitivity recently discovered in the context of non-Hermitian (NH) topological phases may be harnessed to devise novel quantum sensors. Specifically, we study a quantum-optical setting of coupled modes arranged in an array with broken ring geometry that would realize a NH topological phase in the classical limit. Using methods from quantum-information theory of Gaussian states, we show that a small coupling induced between the ends of the broken ring may be detected with a precision that increases exponentially in the number of coupled modes, e.g., by heterodyne detection of two output modes. While this robust effect only relies on reaching a NH topological regime, we identify a resonance phenomenon without direct classical counterpart that provides an experimental knob for drastically enhancing the aforementioned exponential growth. Our findings pave the way towards designing quantum NH topological sensors that may observe with high precision any physical observable that couples to the boundary conditions of the device. |
| first_indexed | 2024-04-24T10:16:31Z |
| format | Article |
| id | doaj.art-ad6b113c27164680b19a47e99461efad |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:16:31Z |
| publishDate | 2022-02-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-ad6b113c27164680b19a47e99461efad2024-04-12T17:17:57ZengAmerican Physical SocietyPhysical Review Research2643-15642022-02-014101311310.1103/PhysRevResearch.4.013113Quantum non-Hermitian topological sensorsFlorian KochJan Carl BudichWe investigate in the framework of quantum noise theory how the striking boundary sensitivity recently discovered in the context of non-Hermitian (NH) topological phases may be harnessed to devise novel quantum sensors. Specifically, we study a quantum-optical setting of coupled modes arranged in an array with broken ring geometry that would realize a NH topological phase in the classical limit. Using methods from quantum-information theory of Gaussian states, we show that a small coupling induced between the ends of the broken ring may be detected with a precision that increases exponentially in the number of coupled modes, e.g., by heterodyne detection of two output modes. While this robust effect only relies on reaching a NH topological regime, we identify a resonance phenomenon without direct classical counterpart that provides an experimental knob for drastically enhancing the aforementioned exponential growth. Our findings pave the way towards designing quantum NH topological sensors that may observe with high precision any physical observable that couples to the boundary conditions of the device.http://doi.org/10.1103/PhysRevResearch.4.013113 |
| spellingShingle | Florian Koch Jan Carl Budich Quantum non-Hermitian topological sensors Physical Review Research |
| title | Quantum non-Hermitian topological sensors |
| title_full | Quantum non-Hermitian topological sensors |
| title_fullStr | Quantum non-Hermitian topological sensors |
| title_full_unstemmed | Quantum non-Hermitian topological sensors |
| title_short | Quantum non-Hermitian topological sensors |
| title_sort | quantum non hermitian topological sensors |
| url | http://doi.org/10.1103/PhysRevResearch.4.013113 |
| work_keys_str_mv | AT floriankoch quantumnonhermitiantopologicalsensors AT jancarlbudich quantumnonhermitiantopologicalsensors |