Dynamical qubit cooling via quasi-particle transport

Kyle Monkman; Jasmin Bedow

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arXiv · 2609.12289

Dynamical qubit cooling via quasi-particle transport

Kyle Monkman·Jasmin Bedow

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Abstract

Cooling a quantum state presents a challenge as the external control in active protocols can induce detrimental heating in the system. Passive cooling processes offer a valuable alternative: Here, we present a simple quench protocol to cool a set of qubits with access to an ancillary spin chain. We show that excitations can be transported out of the qubits as quasi-particles, taking the form of magnons in a ferromagnetic ancilla and triplons in a dimerized antiferromagnetic ancilla. This quasi-particle transport mechanism enables cooling towards both individual and highly entangled two-qubit target states. We demonstrate that this cooling mechanism remains robust starting from thermal states and with finite quench ramp times.

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Kyle Monkman, Jasmin Bedow. 2026-09-10. Dynamical qubit cooling via quasi-particle transport. https://arxiv.org/abs/2609.12289

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