title: Biphoton manipulation with a fiber-based pulse shaper.
abstract: We demonstrate spectral shaping of entangled photons in the telecom band with a programmable, fiber-based optical filter. The fine-resolution spectral control permits implementation of length-40 Hadamard codes, through which we are able to verify frequency anticorrelation with a 20-fold increase in total counts over that permitted by the equivalent pair of monochromators at the same input flux. By programming the complex spectral transmission function corresponding to a Mach-Zehnder interferometer, we also construct variations on Franson interferometers that are free from mechanical instabilities, demonstrating spectral phase independence in the slow-detector limit, in which all temporal features are unobservable. Our configuration furnishes a single, compact arrangement for manipulating telecom biphotons and characterizing their quality.
authors: Joseph M
authors: JM
authors: Lukens
authors: Amir
authors: A
authors: Dezfooliyan
authors: Carsten
authors: C
authors: Langrock
authors: Martin M
authors: MM
authors: Fejer
authors: Daniel E
authors: DE
authors: Leaird
authors: Andrew M
authors: AM
authors: Weiner