title: Measurement and Shaping of Biphoton Spectral Wave Functions.
abstract: In this work we present a simple method to reconstruct the complex spectral wave function of a biphoton, and hence gain complete information about the spectral and temporal properties of a photon pair. The technique, which relies on quantum interference, is applicable to biphoton states produced with a monochromatic pump when a shift of the pump frequency produces a shift in the relative frequencies contributing to the biphoton. We demonstrate an example of such a situation in type-II parametric down conversion allowing arbitrary paraxial spatial pump and detection modes. Moreover, our test cases demonstrate the possibility to shape the spectral wave function. This is achieved by choosing the spatial mode of the pump and of the detection modes, and takes advantage of spatiotemporal correlations.
authors.affiliation: MQ Photonics Research Centre, QSciTech, Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia.|Centre of Excellence for Engineered Quantum Systems, Macquarie University, NSW 2109, Australia.
authors.forename: N
authors.initials: N
authors.lastname: Tischler
authors.affiliation: MQ Photonics Research Centre, QSciTech, Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia.|Centre of Excellence for Engineered Quantum Systems, Macquarie University, NSW 2109, Australia.
authors.forename: A
authors.initials: A
authors.lastname: Büse
authors.affiliation: MQ Photonics Research Centre, QSciTech, Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia.|Centre of Excellence for Ultrahigh bandwidth Devices for Optical Systems, Macquarie University, NSW 2109, Australia.
authors.forename: L G
authors.initials: LG
authors.lastname: Helt
authors.affiliation: MQ Photonics Research Centre, QSciTech, Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia.|Centre of Excellence for Engineered Quantum Systems, Macquarie University, NSW 2109, Australia.
authors.forename: M L
authors.initials: ML
authors.lastname: Juan
authors.affiliation: École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
authors.forename: N
authors.initials: N
authors.lastname: Piro
authors.affiliation: Department of Physics, Indian Institute of Technology Delhi, 110016 New Delhi, India.
authors.forename: J
authors.initials: J
authors.lastname: Ghosh
authors.affiliation: MQ Photonics Research Centre, QSciTech, Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia.|Centre of Excellence for Ultrahigh bandwidth Devices for Optical Systems, Macquarie University, NSW 2109, Australia.
authors.forename: M J
authors.initials: MJ
authors.lastname: Steel
authors.affiliation: MQ Photonics Research Centre, QSciTech, Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia.|Centre of Excellence for Engineered Quantum Systems, Macquarie University, NSW 2109, Australia.
authors.forename: G
authors.initials: G
authors.lastname: Molina-Terriza