Observing a Changing Hilbert-Space Inner Product
| Autor: | Karuvade, Salini, Alase, Abhijeet, Sanders, Barry C. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Phys. Rev. Research 4 (2022) 013016 1-11 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevResearch.4.013016 |
| Popis: | In quantum mechanics, physical states are represented by rays in Hilbert space $\mathscr H$, which is a vector space imbued by an inner product $\langle\,|\,\rangle$, whose physical meaning arises as the overlap $\langle\phi|\psi\rangle$ for $|\psi\rangle$ a pure state (description of preparation) and $\langle\phi|$ a projective measurement. However, current quantum theory does not formally address the consequences of a changing inner product during the interval between preparation and measurement. We establish a theoretical framework for such a changing inner product, which we show is consistent with standard quantum mechanics. Furthermore, we show that this change is described by a quantum channel, which is tomographically observable, and we elucidate how our result is strongly related to the exploding topic of PT-symmetric quantum mechanics. We explain how to realize experimentally a changing inner product for a qubit in terms of a qutrit protocol with a unitary channel. Comment: 12 pages, 4 figures |
| Databáze: | arXiv |
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