No-go result for quantum postselection measurements of rank-m degenerate subspace
| Autor: | Ho, Le Bin |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Physical Review A 2023 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.107.042204 |
| Popis: | We present a no-go result for postselection measurements where the conditional expectation value of a joint system-device observable under postselection is nothing else than the conventional expectation value. Such a no-go result relies on the rank-m degenerate of the joint observable, where m is the dimension of the device subspace. Remarkable, we show that the error and disturbance in quantum measurements obey the no-go result, which implies that the error-disturbance uncertainty is unaffected under postselection measurements. Comment: 6 pages, 0 figure |
| Databáze: | arXiv |
| Externí odkaz: |
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