Research ArticleQUANTUM OPTICS

Deterministic reshaping of single-photon spectra using cross-phase modulation

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Science Advances  25 Mar 2016:
Vol. 2, no. 3, e1501223
DOI: 10.1126/sciadv.1501223

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The frequency conversion of light has proved to be a crucial technology for communication, spectroscopy, imaging, and signal processing. In the quantum regime, it also offers great potential for realizing quantum networks incorporating disparate physical systems and quantum-enhanced information processing over a large computational space. The frequency conversion of quantum light, such as single photons, has been extensively investigated for the last two decades using all-optical frequency mixing, with the ultimate goal of realizing lossless and noiseless conversion. I demonstrate another route to this target using frequency conversion induced by cross-phase modulation in a dispersion-managed photonic crystal fiber. Owing to the deterministic and all-optical nature of the process, the lossless and low-noise spectral reshaping of a single-photon wave packet in the telecommunication band has been readily achieved with a modulation bandwidth as large as 0.4 THz. I further demonstrate that the scheme is applicable to manipulations of a nonclassical frequency correlation, wave packet interference, and entanglement between two photons. This approach presents a new coherent frequency interface for photons for quantum information processing.

  • nonlinear optics
  • quantum optics
  • optical fibers
  • cross phase modulation
  • Single photons
  • Quantum information processing
  • quantum entanglement.

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