title: Quantum interference in heterogeneous superconducting-photonic circuits on a silicon chip.
abstract: Quantum information processing holds great promise for communicating and computing data efficiently. However, scaling current photonic implementation approaches to larger system size remains an outstanding challenge for realizing disruptive quantum technology. Two main ingredients of quantum information processors are quantum interference and single-photon detectors. Here we develop a hybrid superconducting-photonic circuit system to show how these elements can be combined in a scalable fashion on a silicon chip. We demonstrate the suitability of this approach for integrated quantum optics by interfering and detecting photon pairs directly on the chip with waveguide-coupled single-photon detectors. Using a directional coupler implemented with silicon nitride nanophotonic waveguides, we observe 97% interference visibility when measuring photon statistics with two monolithically integrated superconducting single-photon detectors. The photonic circuit and detector fabrication processes are compatible with standard semiconductor thin-film technology, making it possible to implement more complex and larger scale quantum photonic circuits on silicon chips.
authors.affiliation: Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.
authors.forename: C
authors.identifier: http://orcid.org/0000-0002-9220-4021
authors.initials: C
authors.lastname: Schuck
authors.affiliation: Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.
authors.forename: X
authors.initials: X
authors.lastname: Guo
authors.affiliation: Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.
authors.forename: L
authors.initials: L
authors.lastname: Fan
authors.affiliation: Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.|Institute for Quantum Optics and Quantum Information, Austrian Academy of Science, A-1090 Vienna, Austria.
authors.forename: X
authors.initials: X
authors.lastname: Ma
authors.affiliation: Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.
authors.forename: M
authors.identifier: http://orcid.org/0000-0002-5047-8497
authors.initials: M
authors.lastname: Poot
authors.affiliation: Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.
authors.forename: H X
authors.initials: HX
authors.lastname: Tang