TQT Transformative Quantum Technologies logo
Login
  • En
  • Fr
Get Connected
TQT Transformative Quantum Technologies logo
Login
Get Connected

"Find People, Projects, etc."

Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors
job
publications
equipment
media
research
projects
people
events
labs
Filter by Categories
Committee
Leadership
Science
Staff
  • Home
  • Research
  • Opportunities
  • Events
  • About
  • Get Connected
  • Institute for Quantum Computing

    Hybrid Quantum Repeater based on Atomic Quantum Memories and Telecom Wavelength Entangled Photon-Pairs Generated from Semiconductor Nanowires

    Go Back Back

    More Topics

    communication electrical & computer engineering entangled photons grand challenge memory nanowire nodes quantum dots quantum repeater silicon

    Summary

     

    Losses in physical channels, such as optical fibres, limit existing quantum communication systems to modest distance ranges. Since amplification of quantum signals is fundamentally not possible,  we look to extend the range and functionality of these quantum channels by adding quantum memory nodes that can daisy-chain multiple lengths of quantum channels through entanglement and thus extend the communication distance — an approach known as ‘quantum repeater’. Quantum repeaters are by necessity hybrid devices, as they connect flying qubits (photons) to small processors for error correction and privacy amplification. In this project we develop a two-node proof-of-principle hybrid quantum repeater system. We generate entangled photon pairs from quantum dots embedded in semiconductor nanowire and store them in atomic quantum memories following a frequency up-conversion. We expect this will enable quantum key distribution over long distances at rates exceeding those possible through a direct link. The photon-pair sources, the frequency converters, as well as the quantum memories will be implemented in compact on-chip platforms. This novel approach combines the advantages available from a deterministic and tunable solid-state source of bright entangled photon pairs with the potential for high-efficiency long-lived quantum memory that is achievable with laser cooled atoms. The ultimate goal is to achieve a working pair of quantum repeater nodes at practically relevant wavelengths that would lead to useful rates for long-distance quantum key distribution.

     

    Figure 1. The two quantum dots (red triangles embedded in semiconductor nanowires) produce pairs of entangled photons. One photon from each pair is stored in an atomic ensemble memory, while the other photon is sent into a coincidence measurement setup, which generates entanglement between the two atomic ensembles.

    Principal Investigator (PI) or Team Coordinator

    Michal Bajcsy & Michael Reimer

    sidebar icon sidebar icon
    Group communication icon

    Share

    • Share on Twitter
    • Share on Facebook
    • Share on LinkedIn

    Related Content

    Developing Tools for Quantum Characterization and Validation
    TQT Computation

    Developing Tools for Quantum Characterization and Validation

    Summary   Coherence is essential for quantum computation; yet it introduces a unique sensitivity to any imperfections in hardware design, control systems, and the operating environment. Overcoming these sensitivities requires a hierarchy of strategies, ranging from optimization of the hardware architecture to software solutions including quantum error correction. Randomized Benchmarking Protocols are an important family of […]

    October 3, 2017

    PI: Joseph Emerson

    Skip Tags applied math computation + 3 Additional

    • Share on Twitter
    • Share on Facebook
    • Share on LinkedIn
    • Go to Developing Tools for Quantum Characterization and Validation
    Entangled States of Beams and their Applications
    TQT Sensing

    Entangled States of Beams and their Applications

    Summary   With David Cory and collaborators at the National Institute of Standards and Technology (NIST) we explore how to engineer beams of neutron or photons that carry entanglement. The degrees of freedom that can be entangled include spin (polarization), momentum, displacement, and angular momentum. These have potential applications ranging from studies of helical internal magnetic fields […]

    September 7, 2016

    PI: Dmitry Pushin

    Skip Tags chemistry grand challenge + 3 Additional

    • Share on Twitter
    • Share on Facebook
    • Share on LinkedIn
    • Go to Entangled States of Beams and their Applications

    Folk Understanding of Quantum Physics

    Summary  It is often said that quantum concepts are counterintuitive. However, quantum concepts may not be equally counterintuitive to people from all cultural backgrounds. As cultural psychologists have discovered, culture fundamentally shapes the way people make sense of the world. In particular, the last few decades of research have documented cultural differences in appreciation of […]

    March 24, 2021

    PI: Igor Grossmann

    Skip Tags culture dialecticism + 5 Additional

    • Share on Twitter
    • Share on Facebook
    • Share on LinkedIn
    • Go to Folk Understanding of Quantum Physics
    Quantum Information Processing with Molecular Lattices
    TQT Computation

    Quantum Information Processing with Molecular Lattices

    The aim of the work is to develop theoretical tools to simulate and predict the behaviour of a one-dimensional chain of trapped dipolar molecules and to study the nature of entanglement as a design resource.

    June 1, 2017

    PI: Pierre-Nicholas Roy

    Skip Tags chemistry computation + 2 Additional

    • Share on Twitter
    • Share on Facebook
    • Share on LinkedIn
    • Go to Quantum Information Processing with Molecular Lattices

    Connect with Us

    Join us at the frontier of quantum technology development. Request a visit, explore opportunities, and stay informed.

    Get Connected
    TQT Logo
    First Canada Logo
    • twitter icon
    • facebook icon
    • youtube icon
    • Home
    • Research
    • Opportunities
    • Events
    • About
    • Get Connected
    • Institute for Quantum Computing
    TQT Logo
    • Home
    • Research
    • Opportunities
    • Events
    • About
    • Get Connected
    • Institute for Quantum Computing
    • twitter icon
    • facebook icon
    • youtube icon
    First Canada Logo
    TQT Logo
    • twitter icon
    • facebook icon
    • youtube icon
    • Research
    • Overview
    • Updates
    • Projects
    • Publications
    • Labs
    • Quantum Innovation Cycle
    • Opportunities
    • Overview
    • Quantum for Health Design Challenge
    • Quantum for Environment Design Challenge
    • Quantum Seed
    • Technology Development
    • Open Positions
    • Events
    • All Events
    • About
    • Overview
    • People
    • Media
    • Contact
    First Canada Logo