Experimental demonstration of sequential quantum random access codes
A random access code (RAC) is a strategy to encode a message into a shorter one in a way that any bit of the original can still be recovered with nontrivial probability. Encoding with quantum bits rather than classical ones can improve this probability but has an important limitation: Due to the dis...
| Principais autores: | , , , |
|---|---|
| Formato: | Artigo |
| Idioma: | English |
| Publicado em: |
American Physical Society
2020-08-01
|
| coleção: | Physical Review Research |
| Acesso em linha: | http://doi.org/10.1103/PhysRevResearch.2.033205 |
| _version_ | 1827286081441103872 |
|---|---|
| author | Giulio Foletto Luca Calderaro Giuseppe Vallone Paolo Villoresi |
| author_facet | Giulio Foletto Luca Calderaro Giuseppe Vallone Paolo Villoresi |
| author_sort | Giulio Foletto |
| collection | DOAJ |
| description | A random access code (RAC) is a strategy to encode a message into a shorter one in a way that any bit of the original can still be recovered with nontrivial probability. Encoding with quantum bits rather than classical ones can improve this probability but has an important limitation: Due to the disturbance caused by standard quantum measurements, qubits cannot be used more than once. However, as recently shown by Mohan, Tavakoli, and Brunner [New J. Phys. 21, 083034 (2019)NJOPFM1367-263010.1088/1367-2630/ab3773], weak measurements can alleviate this problem, allowing two sequential decoders to perform better than with the best classical RAC. We use single photons to experimentally show that these weak measurements are feasible and nonclassical success probabilities are achievable by two decoders. We prove this for different values of the measurement strength and use our experimental results to put tight bounds on them, certifying the accuracy of our setting. This proves the feasibility of using sequential quantum RACs for quantum information tasks, such as the self-testing of untrusted devices. |
| first_indexed | 2024-04-24T10:25:29Z |
| format | Article |
| id | doaj.art-fd51e2e85a1d4271b49177cbaed4ad3f |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:25:29Z |
| publishDate | 2020-08-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-fd51e2e85a1d4271b49177cbaed4ad3f2024-04-12T16:58:26ZengAmerican Physical SocietyPhysical Review Research2643-15642020-08-012303320510.1103/PhysRevResearch.2.033205Experimental demonstration of sequential quantum random access codesGiulio FolettoLuca CalderaroGiuseppe VallonePaolo VilloresiA random access code (RAC) is a strategy to encode a message into a shorter one in a way that any bit of the original can still be recovered with nontrivial probability. Encoding with quantum bits rather than classical ones can improve this probability but has an important limitation: Due to the disturbance caused by standard quantum measurements, qubits cannot be used more than once. However, as recently shown by Mohan, Tavakoli, and Brunner [New J. Phys. 21, 083034 (2019)NJOPFM1367-263010.1088/1367-2630/ab3773], weak measurements can alleviate this problem, allowing two sequential decoders to perform better than with the best classical RAC. We use single photons to experimentally show that these weak measurements are feasible and nonclassical success probabilities are achievable by two decoders. We prove this for different values of the measurement strength and use our experimental results to put tight bounds on them, certifying the accuracy of our setting. This proves the feasibility of using sequential quantum RACs for quantum information tasks, such as the self-testing of untrusted devices.http://doi.org/10.1103/PhysRevResearch.2.033205 |
| spellingShingle | Giulio Foletto Luca Calderaro Giuseppe Vallone Paolo Villoresi Experimental demonstration of sequential quantum random access codes Physical Review Research |
| title | Experimental demonstration of sequential quantum random access codes |
| title_full | Experimental demonstration of sequential quantum random access codes |
| title_fullStr | Experimental demonstration of sequential quantum random access codes |
| title_full_unstemmed | Experimental demonstration of sequential quantum random access codes |
| title_short | Experimental demonstration of sequential quantum random access codes |
| title_sort | experimental demonstration of sequential quantum random access codes |
| url | http://doi.org/10.1103/PhysRevResearch.2.033205 |
| work_keys_str_mv | AT giuliofoletto experimentaldemonstrationofsequentialquantumrandomaccesscodes AT lucacalderaro experimentaldemonstrationofsequentialquantumrandomaccesscodes AT giuseppevallone experimentaldemonstrationofsequentialquantumrandomaccesscodes AT paolovilloresi experimentaldemonstrationofsequentialquantumrandomaccesscodes |