Many-body quantum optics in a cascaded chiral network

• URL: http://arxiv.org/abs/2607.05760v1
• Date: Tue, 07 Jul 2026 02:38:26 GMT
• Title: Many-body quantum optics in a cascaded chiral network
• Abstract summary: Chiral quantum emitters interact with light only in one propagation direction, allowing them to be linked into cascaded systems.<n>Here we realize a cascaded network of superconducting qubits using an architecture that overcomes these bottlenecks.<n>We observe photons sorted in time by photon number, a signature of the strong photon-photon interactions mediated by the emitters.
• Score: 0.7205546587515871
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Chiral quantum emitters interact with light only in one propagation direction, allowing them to be linked into cascaded systems in which photons mediate ordered, long-range interactions. Such systems are predicted to host novel regimes of many-body physics of light and matter. Exploring these regimes requires arrays of identical quantum emitters with directional, low-loss coupling to guided photons, a combination that has thus far remained experimentally out of reach. Here we realize a cascaded network of superconducting qubits using an architecture that overcomes these bottlenecks. We implement a four-qubit chain spanning two modules, with separations ranging from millimeters to half a meter, and exploit the shared waveguide as a dissipative resource to stabilize reconfigurable entanglement, reaching a genuinely multipartite regime unavailable in reciprocal baths. By scattering weak pulses off the chain, we observe photons sorted in time by photon number, a signature of the strong photon-photon interactions mediated by the emitters. Together, these results provide experimental access to many-body light-matter regimes that are beyond the reach of reciprocal systems.

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