Deterministic Photon Sorting in Waveguide QED Systems

Fan Yang, Mads M. Lund, Thomas Pohl, Peter Lodahl, and Klaus Mølmer
Phys. Rev. Lett. 128, 213603 – Published 24 May 2022
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Abstract

Sorting quantum fields into different modes according to their Fock-space quantum numbers is a highly desirable quantum operation. In this Letter, we show that a pair of two-level emitters, chirally coupled to a waveguide, may scatter single- and two-photon components of an input pulse into orthogonal temporal modes with a fidelity 0.9997. We develop a general theory to characterize and optimize this process and reveal that such a high fidelity is enabled by an interesting two-photon scattering dynamics: while the first emitter gives rise to a complex multimode field, the second emitter recombines the field amplitudes, and the net two-photon scattering induces a self-time reversal of the input pulse mode. The presented scheme can be employed to construct logic elements for propagating photons, such as a deterministic nonlinear-sign gate with a fidelity 0.9995.

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  • Received 17 February 2022
  • Accepted 19 April 2022

DOI:https://doi.org/10.1103/PhysRevLett.128.213603

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Fan Yang1, Mads M. Lund1, Thomas Pohl1, Peter Lodahl2, and Klaus Mølmer1,3,*

  • 1Center for Complex Quantum Systems, Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
  • 2Center for Hybrid Quantum Networks (Hy-Q), Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
  • 3Aarhus Institute of Advanced Studies, Aarhus University, DK-8000 Aarhus C, Denmark

  • *moelmer@phys.au.dk

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Issue

Vol. 128, Iss. 21 — 27 May 2022

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