Two-photon quantum interference and entanglement at 2.1 μm.
Shashi PrabhakarTaylor ShieldsAdetunmise C DadaMehdi EbrahimGregor G TaylorDmitry MorozovKleanthis ErotokritouShigehito MikiMasahiro YabunoHirotaka TeraiCorin B E GawithMichael KuesLucia CaspaniRobert H HadfieldMatteo ClericiPublished in: Science advances (2020)
Quantum-enhanced optical systems operating within the 2- to 2.5-μm spectral region have the potential to revolutionize emerging applications in communications, sensing, and metrology. However, to date, sources of entangled photons have been realized mainly in the near-infrared 700- to 1550-nm spectral window. Here, using custom-designed lithium niobate crystals for spontaneous parametric down-conversion and tailored superconducting nanowire single-photon detectors, we demonstrate two-photon interference and polarization-entangled photon pairs at 2090 nm. These results open the 2- to 2.5-μm mid-infrared window for the development of optical quantum technologies such as quantum key distribution in next-generation mid-infrared fiber communication systems and future Earth-to-satellite communications.
Keyphrases
- monte carlo
- molecular dynamics
- living cells
- energy transfer
- optical coherence tomography
- high resolution
- photodynamic therapy
- room temperature
- high speed
- minimally invasive
- drinking water
- magnetic resonance
- magnetic resonance imaging
- mass spectrometry
- fluorescent probe
- computed tomography
- current status
- risk assessment
- single molecule