Quantum sensing for entangled millimeter-wave photons
Abstract
Single-photon quantum sensors offer unprecedented capability and sensitivity in detection of electromagnetic fields. Single-photon detection at millimeter-wavelengths (mmW) is at the heart of this novel technology but is particularly challenging because its photon energy is 10,000 times smaller than its optical counterpart. Single-photon sensing of mmW can impact many applications, including telecommunications, radio astronomy, remote sensing, automotive radars, imaging, and security screening. We propose to develop a quantum sensor for mmW quantum communications, which enables new capabilities that will benefit security communication and enhanced sensing using the phenomenon of quantum entanglement and encryption based on quantum principles instead of mathematical complexity. We aim to demonstrate single-photon detectors (SPDs) employing quantum devices based on van der Waals (vdW) materials, built on our existing collaboration between Harvard, BBN, and POSTECH. Our previous collaborative works testify to our expertise in this area of research and show that the goals of the proposal are achievable through a joint effort. We plan to use two-dimensional (2D) twisted multilayer graphene heterostructures, which realize nodal superconductivity that can be electrostatically tuned. Together with the extremely low heat capacity of 2D materials and the recently demonstrated nodal superconductivity in these materials, this platform can be exploited for a broadband fast single-photon detection mechanism in the mmW range. We will employ both JJ transition edge detection and kinetic inductance measurement to enable broadband, highly efficient, and low dark current rates in these devices. We plan to demonstrate quantum property measurements of entangled mmW photons using second-order correlation and multiphoton-coincidence correlation measurements. In addition to providing a disruptive technology for quantum information science, this proposal will benefit 5-6G networks. These research projects are a synergistic collaboration between the US PI and the Korean PI, who have complementary expertise in sample preparation, device fabrication, integration and characterization.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 05, 2025
- Source ID
- FA23862414073
Entities
People
- Philip Kim
Organizations
- Air Force Office of Scientific Research
- President and Fellows of Harvard College
- United States Air Force