Work

State-independent quantum key distribution

Year: 2024

Type: article

Abstract: We present an adaptive procedure for aligning quantum nonlocality experiments without any knowledge of the two-qudit state shared by the participating parties. The quantum state produced by the source, its unitary evolution, as well as the actual measurement bases remain unknown to both parties at all times. The entanglement of the quantum state helps establish desired correlations between individual measurement bases of the two distant parties. We implement the procedure in a fiber-based quantum key distribution (QKD) setup with polarization-entangled photons, where we do not rely on any additional alignment tools such as lasers or polarizers. In a QKD scenario, the procedure can be done without any additional measurements beyond those that are performed regardless.

Source: Physical Review A

DOI: 10.1103/physreva.109.012614

Authors: Robert Kindler, Johannes Handsteiner, Jaroslav Kysela, Kuntuo Zhu, Bo Liu, Anton Zeilinger

Institutions: Austrian Academy of Sciences, University of Vienna, Vienna Center for Quantum Science and Technology, State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, National University of Defense Technology

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funders: Österreichischen Akademie der Wissenschaften, Universität Wien, Bundesministerium für Wissenschaft, Forschung und Wirtschaft

OpenAlex ID: W4390918969

FWCI: 1.026

Cites: 22

Cited by: 7

Related to: 10