Protecting an unknown qubit state by weak measurement
Fuente:
arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2020
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866909212910551040 |
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| author | Heibati, Ozra Mani, Azam Faizi, Esfandiar Karimipour, Vahid |
| author_facet | Heibati, Ozra Mani, Azam Faizi, Esfandiar Karimipour, Vahid |
| contents | The problem of combating de-coherence by weak measurements has already been studied for the amplitude damping channel and for specific input states. We generalize this to a large four-parameter family of qubit channels and for the average fidelity over all pure states. As a by-product we classify all the qubit channels which have one invariant pure state and show that the parameter manifold of these channels is isomorphic to $S^2\times S^1\times S^1$ and contains many interesting subclasses of channels. The figure of merit that we use is the average input-output fidelity which we show can be increased up to $30$ percents in some cases, by tuning of the weak measurement parameter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2003_01341 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Protecting an unknown qubit state by weak measurement Heibati, Ozra Mani, Azam Faizi, Esfandiar Karimipour, Vahid Quantum Physics The problem of combating de-coherence by weak measurements has already been studied for the amplitude damping channel and for specific input states. We generalize this to a large four-parameter family of qubit channels and for the average fidelity over all pure states. As a by-product we classify all the qubit channels which have one invariant pure state and show that the parameter manifold of these channels is isomorphic to $S^2\times S^1\times S^1$ and contains many interesting subclasses of channels. The figure of merit that we use is the average input-output fidelity which we show can be increased up to $30$ percents in some cases, by tuning of the weak measurement parameter. |
| title | Protecting an unknown qubit state by weak measurement |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2003.01341 |