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  • Letter
  • Open Access

Directional emission and photon bunching from a qubit pair in waveguide

Maria Maffei, Domenico Pomarico*, Paolo Facchi, Giuseppe Magnifico, Saverio Pascazio, and Francesco V. Pepe

  • *Contact author: domenico.pomarico@ba.infn.it
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Phys. Rev. Research 6, L032017 – Published 24 July, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L032017

Abstract

Waveguide quantum electrodynamics represents a powerful platform to generate entanglement and tailor photonic states. We consider a pair of identical qubits coupled to a parity invariant waveguide in the microwave domain. By working in the one- and two-excitation sectors, we provide a unified view of decay processes and show the common origin of directional single-photon emission and two-photon directional bunching. Unveiling the quantum trajectories, we demonstrate that both phenomena are rooted in the selective coupling of orthogonal Bell states of the qubits with photons propagating in opposite directions. We comment on how to use this mechanism to implement optimized post-selection of Bell states, heralded by the detection of a photon on one side of the system.

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Phys. Rev. Research 6, L032017– Published 24 July, 2024
  • Received 8 February 2024
  • Accepted 5 June 2024
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