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Article: Loss-tolerant quantum key distribution with mixed signal states
Title | Loss-tolerant quantum key distribution with mixed signal states |
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Authors | |
Issue Date | 2020 |
Publisher | American Physical Society. The Journal's web site is located at http://journals.aps.org/pra/ |
Citation | Physical Review A: covering atomic, molecular, and optical physics and quantum information, 2020, v. 102 n. 6, p. article no. 062607 How to Cite? |
Abstract | The security of measurement device-independent quantum key distribution (MDI QKD) relies on a thorough characterization of one's optical source output, especially any noise in the state preparation process. Here, we provide an extension of the loss-tolerant protocol [Phys. Rev. A 90, 052314 (2014)], a leading proof technique for analyzing the security of QKD, to MDI QKD protocols that employ mixed signal states. We first reframe the core of the proof technique, noting its generalization to treat
d-dimensional signal encodings. Concentrating on the qubit signal state case, we find that the mixed states can be interpreted as providing Alice and Bob with a virtual shield system they can employ to reduce Eve's knowledge of the secret key. We then introduce a simple semidefinite programming method for optimizing the virtual twisting operations they can perform on the shield system to yield a higher key rate, along with an example calculation of fundamentally achievable key rates in the case of random polarization modulation error. |
Persistent Identifier | http://hdl.handle.net/10722/295484 |
ISSN | 2023 Impact Factor: 2.6 2023 SCImago Journal Rankings: 1.081 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Bourassa, JE | - |
dc.contributor.author | Primaatmaja, IW | - |
dc.contributor.author | Lim, CCW | - |
dc.contributor.author | Lo, HK | - |
dc.date.accessioned | 2021-01-25T11:15:33Z | - |
dc.date.available | 2021-01-25T11:15:33Z | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | Physical Review A: covering atomic, molecular, and optical physics and quantum information, 2020, v. 102 n. 6, p. article no. 062607 | - |
dc.identifier.issn | 2469-9926 | - |
dc.identifier.uri | http://hdl.handle.net/10722/295484 | - |
dc.description.abstract | The security of measurement device-independent quantum key distribution (MDI QKD) relies on a thorough characterization of one's optical source output, especially any noise in the state preparation process. Here, we provide an extension of the loss-tolerant protocol [Phys. Rev. A 90, 052314 (2014)], a leading proof technique for analyzing the security of QKD, to MDI QKD protocols that employ mixed signal states. We first reframe the core of the proof technique, noting its generalization to treat d-dimensional signal encodings. Concentrating on the qubit signal state case, we find that the mixed states can be interpreted as providing Alice and Bob with a virtual shield system they can employ to reduce Eve's knowledge of the secret key. We then introduce a simple semidefinite programming method for optimizing the virtual twisting operations they can perform on the shield system to yield a higher key rate, along with an example calculation of fundamentally achievable key rates in the case of random polarization modulation error. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at http://journals.aps.org/pra/ | - |
dc.relation.ispartof | Physical Review A: covering atomic, molecular, and optical physics and quantum information | - |
dc.rights | Copyright [2020] by The American Physical Society. This article is available online at [http://dx.doi.org/10.1103/PhysRevA.102.062607]. | - |
dc.title | Loss-tolerant quantum key distribution with mixed signal states | - |
dc.type | Article | - |
dc.identifier.email | Lo, HK: physrdd@hku.hk | - |
dc.identifier.authority | Lo, HK=rp02679 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevA.102.062607 | - |
dc.identifier.scopus | eid_2-s2.0-85097578854 | - |
dc.identifier.hkuros | 321002 | - |
dc.identifier.volume | 102 | - |
dc.identifier.issue | 6 | - |
dc.identifier.spage | article no. 062607 | - |
dc.identifier.epage | article no. 062607 | - |
dc.identifier.isi | WOS:000597805700002 | - |
dc.publisher.place | United States | - |