Near optimal discrimination of binary coherent signals via atom–light interaction
We study the discrimination of weak coherent states of light with significant overlaps by nondestructive measurements on the light states through measuring atomic states that are entangled to the coherent states via dipole coupling. In this way, the problem of measuring and discriminating coherent l...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2018-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/aab2c5 |
| _version_ | 1797750618375323648 |
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| author | Rui Han János A Bergou Gerd Leuchs |
| author_facet | Rui Han János A Bergou Gerd Leuchs |
| author_sort | Rui Han |
| collection | DOAJ |
| description | We study the discrimination of weak coherent states of light with significant overlaps by nondestructive measurements on the light states through measuring atomic states that are entangled to the coherent states via dipole coupling. In this way, the problem of measuring and discriminating coherent light states is shifted to finding the appropriate atom–light interaction and atomic measurements. We show that this scheme allows us to attain a probability of error extremely close to the Helstrom bound, the ultimate quantum limit for discriminating binary quantum states, through the simple Jaynes–Cummings interaction between the field and ancilla with optimized light–atom coupling and projective measurements on the atomic states. Moreover, since the measurement is nondestructive on the light state, information that is not detected by one measurement can be extracted from the post-measurement light states through subsequent measurements. |
| first_indexed | 2024-03-12T16:36:23Z |
| format | Article |
| id | doaj.art-5a39a64787f546c9b97583aef3fd844a |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:36:23Z |
| publishDate | 2018-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-5a39a64787f546c9b97583aef3fd844a2023-08-08T14:52:16ZengIOP PublishingNew Journal of Physics1367-26302018-01-0120404300510.1088/1367-2630/aab2c5Near optimal discrimination of binary coherent signals via atom–light interactionRui Han0https://orcid.org/0000-0003-1282-7075János A Bergou1Gerd Leuchs2Max Planck Institute for the Science of Light, D-91058 Erlangen, Germany; Institute of Optics, Information and Photonics, University of Erlangen-Nürnberg , D-91058 Erlangen, GermanyDepartment of Physics and Astronomy, Hunter College of the City, University of New York , 10065 NY, United States of AmericaMax Planck Institute for the Science of Light, D-91058 Erlangen, Germany; Institute of Optics, Information and Photonics, University of Erlangen-Nürnberg , D-91058 Erlangen, Germany; University of Ottawa , Ottawa ON K1N 6N5, CanadaWe study the discrimination of weak coherent states of light with significant overlaps by nondestructive measurements on the light states through measuring atomic states that are entangled to the coherent states via dipole coupling. In this way, the problem of measuring and discriminating coherent light states is shifted to finding the appropriate atom–light interaction and atomic measurements. We show that this scheme allows us to attain a probability of error extremely close to the Helstrom bound, the ultimate quantum limit for discriminating binary quantum states, through the simple Jaynes–Cummings interaction between the field and ancilla with optimized light–atom coupling and projective measurements on the atomic states. Moreover, since the measurement is nondestructive on the light state, information that is not detected by one measurement can be extracted from the post-measurement light states through subsequent measurements.https://doi.org/10.1088/1367-2630/aab2c5coherent statequantum communicationatom–light interactionHelstrom boundnondestructive measurementstate discrimination |
| spellingShingle | Rui Han János A Bergou Gerd Leuchs Near optimal discrimination of binary coherent signals via atom–light interaction New Journal of Physics coherent state quantum communication atom–light interaction Helstrom bound nondestructive measurement state discrimination |
| title | Near optimal discrimination of binary coherent signals via atom–light interaction |
| title_full | Near optimal discrimination of binary coherent signals via atom–light interaction |
| title_fullStr | Near optimal discrimination of binary coherent signals via atom–light interaction |
| title_full_unstemmed | Near optimal discrimination of binary coherent signals via atom–light interaction |
| title_short | Near optimal discrimination of binary coherent signals via atom–light interaction |
| title_sort | near optimal discrimination of binary coherent signals via atom light interaction |
| topic | coherent state quantum communication atom–light interaction Helstrom bound nondestructive measurement state discrimination |
| url | https://doi.org/10.1088/1367-2630/aab2c5 |
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