Feasible high-dimensional measurement-device-independent quantum key distribution

Abstract

Measurement-device-independent quantum key distribution (MDI-QKD) can resist all possible attacks from practical measurement devices. High-dimensional (HD) MDI-QKD in multiple degrees of freedom (DOFs) can efficiently increase the key generation rate and has strong noise and error resistance. However, previous HD MDI-QKD protocols in multiple DOFs required complete hyperentangled Bell state analysis (HBSA), which cannot be realized under current experimental conditions and largely limits the practicality of the HD MDI-QKD. In this paper, we propose an HD MDI-QKD protocol in multiple DOFs which adopts a linear-optical HBSA. This adoption of the linear-optical HBSA makes our HD MDI-QKD feasible under current experimental technology. The key generation rate of our MDI-QKD protocol is about eight times of the original MDI-QKD protocol. Our HD MDI-QKD protocol may have potential applications in current and future quantum communication fields.

Optimal Estimation of Quantum Coherence by Bell State Measurement: A Case Study

“…Bell state measurement (BSM) is itself entangling: it is the projection onto the basis of Bell states and plays crucial roles in many quantum information tasks such as quantum teleportation [3][4][5], quantum key distribution [6,7], quantum dense coding [8,9], entanglement swapping [10,11]. In recent years, to study quantum teleportation for complex quantum systems and develop high-efficiency quantum information networks [12,13], a high-dimensional Bell state measurement has been realized experimentally [14][15][16]. BSM mainly determines the efficiency of these quantum communication tasks; Therefore, BSM is of great significance in quantum information technology.…”

Polarization-path-frequency entanglement using interferometry and frequency shifters

“…A platform for photon-efficient quantum communication with energy-time-polarization high-dimensional encoding has been proposed using a biphoton frequency comb technique [5]. Recently a higher-dimensional measurementdevice-independent quantum key distribution protocol in multiple DOFs which is based on a linear-optical hyperentangled Bell state analysis has also been proposed [38]. Most applications of the frequency degree-of-freedom in a higher-dimensional entangled system are premised on distinct frequency shifts and usually on two frequency states, such as in the case of remote state preparation of single-photon states in polarization and frequency DoFs [39].…”