Quantum

Coherence-assisted quantum state preparation and thermal control through repeated interactions

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 09/10/2026, 04:13:25 UTC.

Briefings

A 2026 arXiv preprint investigates how environmental coherence enables quantum systems to prepare states with lower effective temperatures than the bath, using an energy-conserving flip-flop interaction. The study derives an exact analytical solution showing that coherent ancillas can increase ground-state population beyond the bath temperature and enhance steady-state purity, with heat transfer direction controlled by relative phases rather than magnitudes. Key findings include the establishment of coherence as a resource for dissipative state preparation and anomalous heat flow reversal, though the authors note that purity cannot exceed ancilla purity.

Key points

• The study derives an exact analytical solution for the steady state of a qubit interacting with a coherent environment via an energy-conserving flip-flop interaction.
• Environmental coherence can increase the system's ground-state population beyond the bath temperature, effectively lowering the system's effective temperature.

Context and limitations

The analysis is limited to the Markovian repeated-interaction framework and assumes nonperturbative dependence on environmental coherence. Results are based on a single preprint snapshot from October 2026, and the authors explicitly state that the purity of the system can never exceed the ancilla purity.

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