Atoms in separated resonators can jointly absorb a single photon

TL;DR

This paper demonstrates that a single photon can coherently excite multiple qubits located in separate resonators within an array, revealing new possibilities for quantum information processing.

Contribution

It extends the understanding of photon-induced qubit excitation to multi-resonator systems, showing near-unity probability under certain conditions.

Findings

Single photon can excite multiple qubits in separate resonators

High excitation probability approaches one under specific setups

Provides insights into causality in distributed quantum systems

Abstract

The coherent nonlinear process where a single photon simultaneously excites two or more two-level systems (qubits) in a single-mode resonator has recently been theoretically predicted. Here we explore the case where the two qubits are placed in different resonators in an array of two or three weakly coupled resonators. Investigating different setups and excitation schemes, we show that this process can still occur with a probability approaching one under specific conditions. The obtained results provide interesting insights into subtle causality issues underlying the simultaneous excitation processes of qubits placed in different resonators.