One-photon measurement of two-photon entanglement
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2020
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| _version_ | 1866911967514460160 |
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| author | Lemos, Gabriela Barreto Lapkiewicz, Radek Hochrainer, Armin Lahiri, Mayukh Zeilinger, Anton |
| author_facet | Lemos, Gabriela Barreto Lapkiewicz, Radek Hochrainer, Armin Lahiri, Mayukh Zeilinger, Anton |
| contents | Entanglement is a fundamental feature of quantum mechanics, considered a key resource in quantum information processing. Measuring entanglement is an essential step in a wide range of applied and foundational quantum experiments. When a two-particle quantum state is not pure, standard methods to measure the entanglement require detection of both particles. We introduce a method in which detection of only one of the particles is required to characterize the entanglement of a two-particle mixed state. Our method is based on the principle of quantum interference. We use two identical sources of a two-photon mixed state and generate a set of single-photon interference patterns. The entanglement of the two-photon quantum state is characterized by the visibility of the interference patterns. Our experiment thus opens up a distinct avenue for verifying and measuring entanglement, and can allow for mixed state entanglement characterization even when one particle in the pair cannot be detected. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2009_02851 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | One-photon measurement of two-photon entanglement Lemos, Gabriela Barreto Lapkiewicz, Radek Hochrainer, Armin Lahiri, Mayukh Zeilinger, Anton Quantum Physics Entanglement is a fundamental feature of quantum mechanics, considered a key resource in quantum information processing. Measuring entanglement is an essential step in a wide range of applied and foundational quantum experiments. When a two-particle quantum state is not pure, standard methods to measure the entanglement require detection of both particles. We introduce a method in which detection of only one of the particles is required to characterize the entanglement of a two-particle mixed state. Our method is based on the principle of quantum interference. We use two identical sources of a two-photon mixed state and generate a set of single-photon interference patterns. The entanglement of the two-photon quantum state is characterized by the visibility of the interference patterns. Our experiment thus opens up a distinct avenue for verifying and measuring entanglement, and can allow for mixed state entanglement characterization even when one particle in the pair cannot be detected. |
| title | One-photon measurement of two-photon entanglement |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2009.02851 |