title: Deterministic reshaping of single-photon spectra using cross-phase modulation.
abstract: 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.
authors.affiliation: NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan. E-mail: m.nobuyuki@lab.ntt.co.jp.
authors.forename: Nobuyuki
authors.identifier: 0000-0001-6014-3570
authors.initials: N
authors.lastname: Matsuda
mesh_terms: D008962:Models, Theoretical; D055095:Optics and Photonics; D017785:Photons
keywords: Quantum information processing; Single photons; cross phase modulation; nonlinear optics; optical fibers; quantum entanglement.; quantum optics