Quantum Key Distribution Using Polarized Single Photons
Abstract
Exhaustive research, development, and testing studies were performed on novel superconducting single-photon detectors (SSPDs), based on NbN, meander-type, nano-stripe structures. The fiber-coupled SSPD receivers, designed for quantum key distribution telecommunication networks, were successfully operated without interruption for over a 2-month period inside a liquid-helium Dewar. The developed SSPD receivers possessed both the photon-energy and photon-number resolving capabilities. The phenomenon of dark/unwanted counts in our SSPDs was extensively studied and it was demonstrated that the transient resistive state was due to depairing of vortex-antivortex pairs. An efficient source for generation of entangled-photon pairs for ultrafast quantum cryptography, using a spontaneous down conversion effect and femtosecond optical pulses was designed and experimentally tested. A significant research progress was achieved in the area of novel photon-detector concepts based on MgB2 and Hg-Ba-Ca-Cu-O high-temperature superconducting materials, and ferromagnet/superconductor nano-bilayer structures.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2009
- Accession Number
- ADA502752
Entities
People
- Roman Sobolewski
Organizations
- University of Rochester