Ultra-High-Speed Secure Quantum Communications
Abstract
This equipment proposal is intended to augment several substantial ongoing activities at University of Arizona, supported by ONR MURI on Fundamental Research on Wavelength-Agile High-Rate-QKD in a Marine Environment and free-space optical (FSO)/fiber-optics communicationsÕ activities, supported in the past by NSF, AFOSR through STTR program, and several industry grants. The first activity is related to investigation of agile QKD strategies that can automatically adjust for optimal performance in highly-variable environment encountered over the sea-deck. The second activity is related to various coding techniques to enable continuous variable (CV)-QKD over both FSO links in the presence of atmospheric turbulence and fiber-optics links. Proposed equipment will support experiments related to: (1) development of novel CV-QKD scheme with secure key rates in order several hundreds of Gb/s and (2) novel methods of multidimensional signaling based on spatial modes and novel degrees of freedom, in particular by photon angular momentum and fiber Bragg gratings with mutually orthogonal impulse response derived from Slepian sequences. Recent studies indicate that employment of multiple photon degrees of freedom, can dramatically improve photon information capacity and energy-efficiency over both FSO and fiber-optics links. In order to enable the Ultra-High-Speed Secure Quantum Communications, we are currently in the process of developing an advanced quantum communicationsÕ testbed composed of: (i) outdoor FSO experimental setup at University of Arizona to provide a credible link between theoretical studies and experimental results and (ii) few-mode fiber-optics experimental setup. This testbed will be used in study of both quantum and classical FSO/fiber-optics communication systems. For that purpose, purchase of an arbitrary waveform generator (AWG) with four channels with sampling rate at 120 GSa/s each, four 45 GHz photodetectors for 4-D optical receiver, and one 64 Gbaud LN Modulator is required. Existing spatial light modulators have been already in use to generate and detect spatial modes, the outdoor FSO setup is used to study the atmospheric turbulence effects in a desert environment; while single photon detectors are used in discrete-variable (DV)-QKD experiments. The existing MEMS-based deformable mirrors and wavefront sensor will be used to deal with strong atmospheric turbulence effects, while the AWG and I/Q modulators to be purchased will be used to generate multidimensional signal constellations for CV-QKD and classical communication applications. The 45 GHz photodetectors will be used for quantum communication and CV-QKD studies.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 09, 2020
- Source ID
- W911NF2010079
Entities
People
- Ivan B. Djordjevic
Organizations
- Army Contracting Command
- United States Army
- University of Arizona