Working Group 1

The members of working group 1 (WG1) are focusing on the generation, detection and storage of quantum states of light at the nanoscale. We wish to combine the latest advances in nano-photonics with quantum-inspired applications. Important themes include:

  • Single quantum emitters (quantum dots, colour centers and organic molecules) embedded in nanoscale structures for enhanced collection efficiencies, integration in optical circuits or single-photon nonlinearities.
  • Efficient single-photon detectors based on superconducting nanostructures, with an emphasis on integrating them in optical circuits.
  • Study of new nanomaterials, metamaterials and quantum plasmonics for generating and manipulating nonclassical light.
  • Quantum memories based on nanoscale structures.

Christophe Couteau

WG1 Leader

Our goal is to connect WG1 researchers through events (meetings, training school) to stimulate collaborations and produce concrete outcomes such as short-term scientific missions, joint publications, review papers, patents, workshops and project proposals.

WG1 is also the most-application oriented working group of this Action, and an emphasis is put on involving industries in our events.

Matrix WG 1
TOPICSSUPERCONDUCTING
DETECTORS PHYSICS
AND PERFORMANCE
SOURCESProcessing/memories/
interfaces/applications
MATERIALS &
SYSTEMS
– Superconducting nanowire single-photo detectors (meanders, nanodetectors)
– NbN, NbTiN, WSi, MoSi, YBCO
– Alternative substrates
– Nano-fabrication
– Waveguide detectors
– Semiconductor quantum dots
– Organic molecules
– SPDC/SFWM
– Color centres in diamond
– Rare earth ion doped crystals
– Trapped atoms
– Electrical pumping of quantum dots
– Tapered optical fibers with a nanofiber waist and >99% transmission
– Tunable Whispering-Gallery-Mode (WGM) resonators with Q > 10e8
– Nonlinear waveguides (PPLN, PPKTP)
THEORY &
MODELS
– Superconductivity in nanostructures
– Finite difference time-domain simulation
– Numerical simulations of the detection mechanism
– Conventional and non-conventional superconductors
– Finite difference time-domain simulation
– Optical Bloch equations
– Jaynes-Cummings models
– Density functional theory
– Fermi’s Golden Rule calculations
– Density matrix approach for coupling with reservoir
– Semi-classical description of (arrays of) multi-level atoms with optical nearfields
– Full quantum description of the interaction of multi-level atoms with WGM resonator modes
EXPERIMENTS– Multi-photon excitations
– Optical, electrical, temperature & magnetic field studies at < 1 K
– High-temperature operation
– Multilayers and novel geometries
Confocal microscopy
– Correlation function measurements
– Quantum interference
– Low-temperature experiments
– Spectral and spatial modes control
– Electrical pumping
– Coupling of sources to waveguide devices, open microcavities and nano-cavities
– Cold cesium atoms trapped and interfaced
via nanofiber-guided light
– CQED with single Rubidium atoms coupled
to WGM resonators
– Frequency conversion
– Interfacing rare-earth-ion doped quantum
memories with single-photon sources
– Quantum random number generation with
nanoscale devices
– Feasibility of free-space/satellite QKD with
nanoscale sources and detectors