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Shedding Light on The Unconventional Photon Blockade Effect
Observation of unconventional photon blockade
Discovering the mechanism behind strong photon antibunching in
coupled cavities brings us a step closer to ideal single
photon sources in quantum technologies
Solving equations of motion of photons in two coupled cavities
Scanning laser
Cryostat (5k)
λ/2 λ/2
Pol
Avalanche
photo diode
Microscope
objective
Polarizer
( )
This creates a stream of "antibunched" photons
that are more regularly spaced out than in a
classical light source
Single photons
How does this unconventional
photon blockade work?
Quantum technologies like
cryptography and imaging need
"single photon" light sources that can
emit photons one by one
2 coupled
optical cavities
Light source
Population of the
cavity by 2 photons
is blocked
In 2010 a new system of 2 coupled optical cavities
with weak optical nonlinearity was found to create
an "unconventional photon blockade"
Coupled superconducting resonators with bottom
resonator slightly nonlinear due to presence of SQUID
(Superconducting Quantum Interference Device)
Used to observe blockade in the microwave domain
Setup of quantum dot cavity quantum electrodynamics
device operating in a weak coupling regime
Origin of strong photon antibunching in weakly nonlinear photonic molecules
Bamba et al. (2011) | Physical Review A | DOI: 10.1103/PhysRevA.83.021802
Motoaki Bamba
bamba.motoaki.y13@kyoto-u.jp
Strong photon antibunching caused by
destructive quantum interference between
the direct excitation path
(|00> |10> |20>)
and indirect excitation path taken by photons
(|00> |10> |01> |11> |20>)
Revealed mechanism
Destructive
interference leading to
antibunching
Vaneph et al. (2018)
Snijders et al. (2018)

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Shedding Light on The Unconventional Photon Blockade Effect

  • 1. Shedding Light on The Unconventional Photon Blockade Effect Observation of unconventional photon blockade Discovering the mechanism behind strong photon antibunching in coupled cavities brings us a step closer to ideal single photon sources in quantum technologies Solving equations of motion of photons in two coupled cavities Scanning laser Cryostat (5k) λ/2 λ/2 Pol Avalanche photo diode Microscope objective Polarizer ( ) This creates a stream of "antibunched" photons that are more regularly spaced out than in a classical light source Single photons How does this unconventional photon blockade work? Quantum technologies like cryptography and imaging need "single photon" light sources that can emit photons one by one 2 coupled optical cavities Light source Population of the cavity by 2 photons is blocked In 2010 a new system of 2 coupled optical cavities with weak optical nonlinearity was found to create an "unconventional photon blockade" Coupled superconducting resonators with bottom resonator slightly nonlinear due to presence of SQUID (Superconducting Quantum Interference Device) Used to observe blockade in the microwave domain Setup of quantum dot cavity quantum electrodynamics device operating in a weak coupling regime Origin of strong photon antibunching in weakly nonlinear photonic molecules Bamba et al. (2011) | Physical Review A | DOI: 10.1103/PhysRevA.83.021802 Motoaki Bamba bamba.motoaki.y13@kyoto-u.jp Strong photon antibunching caused by destructive quantum interference between the direct excitation path (|00> |10> |20>) and indirect excitation path taken by photons (|00> |10> |01> |11> |20>) Revealed mechanism Destructive interference leading to antibunching Vaneph et al. (2018) Snijders et al. (2018)