title: Quantum interference between transverse spatial waveguide modes.
abstract: Integrated quantum optics has the potential to markedly reduce the footprint and resource requirements of quantum information processing systems, but its practical implementation demands broader utilization of the available degrees of freedom within the optical field. To date, integrated photonic quantum systems have primarily relied on path encoding. However, in the classical regime, the transverse spatial modes of a multi-mode waveguide have been easily manipulated using the waveguide geometry to densely encode information. Here, we demonstrate quantum interference between the transverse spatial modes within a single multi-mode waveguide using quantum circuit-building blocks. This work shows that spatial modes can be controlled to an unprecedented level and have the potential to enable practical and robust quantum information processing.
authors.affiliation: School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14853, USA.|Department of Electrical Engineering, Columbia University, New York, New York 10027, USA.
authors.forename: Aseema
authors.initials: A
authors.lastname: Mohanty
authors.affiliation: School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14853, USA.|School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Mian
authors.initials: M
authors.lastname: Zhang
authors.affiliation: School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14853, USA.|Department of Electrical Engineering, Columbia University, New York, New York 10027, USA.
authors.forename: Avik
authors.identifier: 0000-0002-6064-4356
authors.initials: A
authors.lastname: Dutt
authors.affiliation: School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA.|Institute for Physics, Humboldt-University Berlin, 12489 Berlin, Germany.
authors.forename: Sven
authors.initials: S
authors.lastname: Ramelow
authors.affiliation: Instituto de Fisica, Universidade de São Paulo, P.O. Box 66318, São Paulo 05315-970, Brazil.
authors.forename: Paulo
authors.initials: P
authors.lastname: Nussenzveig
authors.affiliation: School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14853, USA.|Department of Electrical Engineering, Columbia University, New York, New York 10027, USA.|Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, USA.
authors.forename: Michal
authors.initials: M
authors.lastname: Lipson