Year: 2020
Type: article
Abstract: To build a global quantum-communication network, low-transmission, fiber-based communication channels can be supplemented by using a free-space channel between a satellite and a ground station on Earth. We construct a system that generates hyperentangled photonic ``ququarts'' and measures them to execute multiple quantum-communication protocols of interest. We successfully execute and characterize superdense teleportation, a modified remote-state preparation protocol that transfers more quantum information than standard teleportation, for the same classical information cost, and moreover, is in principle deterministic. Our measurements show an average fidelity of $0.94\ifmmode\pm\else\textpm\fi{}0.02$, with a phase resolution of approximately ${7}^{\ensuremath{\circ}}$, allowing reliable transmission of $>{10}^{5}$ distinguishable quantum states. Additionally, we demonstrate the ability to compensate for the Doppler shift, which would otherwise prevent sending time-bin encoded states from a rapidly moving satellite, thus allowing the low-error execution of phase-sensitive protocols during an orbital pass. Finally, we show that the estimated number of received coincidence counts in a realistic implementation is sufficient to enable faithful reconstruction of the received state in a single pass.
Source: Physical Review Applied
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
Awards: QUANTUM TECHNOLOGY HAS MADE REVOLUTIONARY ADVANCES IN THE BROAD AREA OF QUANTUM-ENHANCED COMMUNICATION, CAPITALIZING ON THE QUANTUM MECHANICAL CORREL, QUANTUM TECHNOLOGY HAS REVOLUTIONIZED THE AREAS OF SENSING, COMMUNICATION, AND SECURITY OVER THE PAST 20 YEARS. ADVANCES IN THESE AREAS ARE CENTERED
OpenAlex ID: W2913809685