Fully Passive Quantum Key Distribution

Wenyuan Wang¹, Rong Wang¹, Chengqiu Hu¹, Victor Zapatero^{2

3

4}, Li Qian^{5

6}, Bing Qi⁷, Marcos Curty^{2

3

4}, Hoi-Kwong Lo^{1

5

6

8

9}

Affiliations

¹ Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong.
² Vigo Quantum Communication Center, University of Vigo, Vigo E-36310, Spain.
³ Escuela de Ingeniería de Telecomunicación, Department of Signal Theory and Communications, University of Vigo, Vigo E-36310, Spain.
⁴ AtlanTTic Research Center, University of Vigo, Vigo E-36310, Spain.
⁵ Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada.
⁶ Centre for Quantum Information and Quantum Control (CQIQC), University of Toronto, Toronto, Ontario, M5S 1A7, Canada.
⁷ Cisco Systems, San Jose, California 95134, USA.
⁸ Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, Canada.
⁹ Quantum Bridge Technologies, Inc., 100 College Street, Toronto, Ontario, M5G 1L5, Canada.

PMID: 37327415
DOI: 10.1103/PhysRevLett.130.220801

Fully Passive Quantum Key Distribution

Wenyuan Wang et al. Phys Rev Lett. 2023.

. 2023 Jun 2;130(22):220801.

doi: 10.1103/PhysRevLett.130.220801.

Authors

Wenyuan Wang¹, Rong Wang¹, Chengqiu Hu¹, Victor Zapatero^{2

3

4}, Li Qian^{5

6}, Bing Qi⁷, Marcos Curty^{2

3

4}, Hoi-Kwong Lo^{1

5

6

8

9}

Affiliations

¹ Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong.
² Vigo Quantum Communication Center, University of Vigo, Vigo E-36310, Spain.
³ Escuela de Ingeniería de Telecomunicación, Department of Signal Theory and Communications, University of Vigo, Vigo E-36310, Spain.
⁴ AtlanTTic Research Center, University of Vigo, Vigo E-36310, Spain.
⁵ Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada.
⁶ Centre for Quantum Information and Quantum Control (CQIQC), University of Toronto, Toronto, Ontario, M5S 1A7, Canada.
⁷ Cisco Systems, San Jose, California 95134, USA.
⁸ Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, Canada.
⁹ Quantum Bridge Technologies, Inc., 100 College Street, Toronto, Ontario, M5G 1L5, Canada.

PMID: 37327415
DOI: 10.1103/PhysRevLett.130.220801

Abstract

We propose a fully passive linear optical quantum key distribution (QKD) source that implements both random decoy-state and encoding choices with postselection only, thus eliminating all side channels in active modulators. Our source is general purpose and can be used in, e.g., BB84, the six-state protocol, and reference-frame-independent QKD. It can even potentially be combined with measurement-device-independent QKD to achieve robustness against side channels in both detectors and modulators. We also perform a proof-of-principle experimental source characterization to show its feasibility.

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Fully Passive Quantum Key Distribution

Affiliations

Fully Passive Quantum Key Distribution

Authors

Affiliations

Abstract

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