Chiral quantum state circulation from photon lattice topology

• URL: http://arxiv.org/abs/2510.01306v2
• Date: Wed, 08 Oct 2025 22:18:03 GMT
• Title: Chiral quantum state circulation from photon lattice topology
• Authors: Souvik Bandyopadhyay, Anushya Chandran, Philip JD Crowley,
• Abstract summary: Chiral quantum state circulation is essential to the working of a quantum computer.<n>We propose a cavity-QED architecture consisting of three cavities coupled to a qubit.<n>We compute the circulation period in the semi-classical limit, demonstrate that circulation persists for time-scales diverging with the total photon number.
• Score: 18.99444800453706
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Chiral quantum state circulation is the unidirectional transfer of a quantum state from one subsystem to the next. It is essential to the working of a quantum computer; for instance, for state preparation and isolation. We propose a cavity-QED architecture consisting of three cavities coupled to a qubit, in which \emph{any} photonic state of cavity 1 with sufficiently many photons circulates to cavity 2 after a fixed time interval, and then to cavity 3 and back to 1. Cavity-state circulation arises from topologically protected chiral boundary states in the associated photon lattice and is thus robust to perturbation. We compute the circulation period in the semi-classical limit, demonstrate that circulation persists for time-scales diverging with the total photon number, and provide a Floquet protocol to engineer the desired Hamiltonian. Superconducting qubits offer an ideal platform to build and test these devices in the near term.

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