Measurement-Protected Quantum Key Distribution
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2019
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| _version_ | 1866909982784487424 |
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| author | Kechrimparis, Spiros Ko, Heasin Ko, Young-Ho Kim, Kap-Joong Choi, Byung-Seok Kropf, Chahan M. Youn, Chun Ju Bae, Joonwoo |
| author_facet | Kechrimparis, Spiros Ko, Heasin Ko, Young-Ho Kim, Kap-Joong Choi, Byung-Seok Kropf, Chahan M. Youn, Chun Ju Bae, Joonwoo |
| contents | In the distribution of quantum states over a long distance, not only are quantum states corrupted by interactions with an environment but also a measurement setting should be re-aligned such that detection events can be ensured for the resulting states. In this work, we present measurement-protected quantum key distribution where a measurement is protected against the interactions quantum states experience during the transmission, without the verification of a channel. As a result, a receiver does not have to revise the measurement that has been prepared in a noiseless scenario since it would remain ever optimal. The measurement protection is achieved by applications of local unitary transformations before and after the transmission, that leads to a supermap transforming an arbitrary channel to a depolarization one. An experimental demonstration is presented with the polarization encoding on photonic qubits. It is shown that the security bounds for prepare-and-measure protocols can be improved, for instance, errors up to 20.7% can be tolerated in the Bennett-Brassard 1984 protocol. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1912_00768 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Measurement-Protected Quantum Key Distribution Kechrimparis, Spiros Ko, Heasin Ko, Young-Ho Kim, Kap-Joong Choi, Byung-Seok Kropf, Chahan M. Youn, Chun Ju Bae, Joonwoo Quantum Physics In the distribution of quantum states over a long distance, not only are quantum states corrupted by interactions with an environment but also a measurement setting should be re-aligned such that detection events can be ensured for the resulting states. In this work, we present measurement-protected quantum key distribution where a measurement is protected against the interactions quantum states experience during the transmission, without the verification of a channel. As a result, a receiver does not have to revise the measurement that has been prepared in a noiseless scenario since it would remain ever optimal. The measurement protection is achieved by applications of local unitary transformations before and after the transmission, that leads to a supermap transforming an arbitrary channel to a depolarization one. An experimental demonstration is presented with the polarization encoding on photonic qubits. It is shown that the security bounds for prepare-and-measure protocols can be improved, for instance, errors up to 20.7% can be tolerated in the Bennett-Brassard 1984 protocol. |
| title | Measurement-Protected Quantum Key Distribution |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/1912.00768 |