Enhancing quantum state discrimination with indefinite causal order
The standard quantum state discrimination problem can be understood as a communication scenario involving a sender and a receiver following these three steps: (i) the sender encodes information in pre-agreed quantum states, (ii) sends them over a noiseless channel, and (iii) the receiver decodes the...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/ada05e |
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| author | Spiros Kechrimparis James Moran Athena Karsa Changhyoup Lee Hyukjoon Kwon |
| author_facet | Spiros Kechrimparis James Moran Athena Karsa Changhyoup Lee Hyukjoon Kwon |
| author_sort | Spiros Kechrimparis |
| collection | DOAJ |
| description | The standard quantum state discrimination problem can be understood as a communication scenario involving a sender and a receiver following these three steps: (i) the sender encodes information in pre-agreed quantum states, (ii) sends them over a noiseless channel, and (iii) the receiver decodes the information by performing appropriate measurements on the received states. In a practical setting, however, the channel is not only noisy but often also unknown, thus altering the states and making optimal decoding generally not possible. In this work, we study this noisy discrimination scenario using a protocol based on indefinite causal order. To this end, we consider the quantum switch and define its higher-order generalisations, which we call superswitches . We find that, for certain channels and ensembles, the guessing probability can be significantly improved compared to both single- and multiple-copy state discrimination. |
| format | Article |
| id | doaj-art-568921d618ea4df0a2bf9b5ae5f55df7 |
| institution | Kabale University |
| issn | 1367-2630 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj-art-568921d618ea4df0a2bf9b5ae5f55df72024-12-30T08:00:35ZengIOP PublishingNew Journal of Physics1367-26302024-01-01261212303010.1088/1367-2630/ada05eEnhancing quantum state discrimination with indefinite causal orderSpiros Kechrimparis0https://orcid.org/0000-0002-8731-9334James Moran1Athena Karsa2Changhyoup Lee3https://orcid.org/0000-0002-1401-4230Hyukjoon Kwon4https://orcid.org/0000-0001-5520-0905School of Computational Sciences, Korea Institute for Advanced Study , Seoul 02455, Republic of KoreaQuantum Universe Center, Korea Institute for Advanced Study , Seoul 02455, Republic of KoreaSchool of Physics & Astronomy, University College London , London WC1E 6BT, United Kingdom; Korea Research Institute of Standards and Science , Daejeon 34113, Republic of KoreaKorea Research Institute of Standards and Science , Daejeon 34113, Republic of KoreaSchool of Computational Sciences, Korea Institute for Advanced Study , Seoul 02455, Republic of Korea; Quantum Universe Center, Korea Institute for Advanced Study , Seoul 02455, Republic of KoreaThe standard quantum state discrimination problem can be understood as a communication scenario involving a sender and a receiver following these three steps: (i) the sender encodes information in pre-agreed quantum states, (ii) sends them over a noiseless channel, and (iii) the receiver decodes the information by performing appropriate measurements on the received states. In a practical setting, however, the channel is not only noisy but often also unknown, thus altering the states and making optimal decoding generally not possible. In this work, we study this noisy discrimination scenario using a protocol based on indefinite causal order. To this end, we consider the quantum switch and define its higher-order generalisations, which we call superswitches . We find that, for certain channels and ensembles, the guessing probability can be significantly improved compared to both single- and multiple-copy state discrimination.https://doi.org/10.1088/1367-2630/ada05equantum state discriminationindefinite causal orderquantum communicationquantum switch |
| spellingShingle | Spiros Kechrimparis James Moran Athena Karsa Changhyoup Lee Hyukjoon Kwon Enhancing quantum state discrimination with indefinite causal order New Journal of Physics quantum state discrimination indefinite causal order quantum communication quantum switch |
| title | Enhancing quantum state discrimination with indefinite causal order |
| title_full | Enhancing quantum state discrimination with indefinite causal order |
| title_fullStr | Enhancing quantum state discrimination with indefinite causal order |
| title_full_unstemmed | Enhancing quantum state discrimination with indefinite causal order |
| title_short | Enhancing quantum state discrimination with indefinite causal order |
| title_sort | enhancing quantum state discrimination with indefinite causal order |
| topic | quantum state discrimination indefinite causal order quantum communication quantum switch |
| url | https://doi.org/10.1088/1367-2630/ada05e |
| work_keys_str_mv | AT spiroskechrimparis enhancingquantumstatediscriminationwithindefinitecausalorder AT jamesmoran enhancingquantumstatediscriminationwithindefinitecausalorder AT athenakarsa enhancingquantumstatediscriminationwithindefinitecausalorder AT changhyouplee enhancingquantumstatediscriminationwithindefinitecausalorder AT hyukjoonkwon enhancingquantumstatediscriminationwithindefinitecausalorder |