Quantum

Memory--Transport Competition in Physical Two-Bath Quantum Reset Dynamics

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Briefings

A new quantum protocol replaces bath occupations while preserving system-bath coherences, but this protocol fails to produce a physical fermionic state. The study constructs a two-reservoir model with independent, number-conserving thermal attenuators that satisfy complete positivity and fermionic admissibility. Quadratic dynamics reduce the stroboscopic problem to an exact matrix fixed-point equation, showing coherence retention enhances short-cycle transfer rates. An exact stationary continuity theorem forces the through-current to vanish if either reservoir is unrefreshed, though no such theorem exists at complete erasure.

Key points

• A two-reservoir protocol with independent, number-conserving thermal attenuators preserves arbitrary system-bath coherences while maintaining complete positivity and fermionic admissibility.
• Quadratic dynamics reduce the stroboscopic problem to an exact matrix fixed-point equation, showing coherence retention enhances the leading short-cycle transfer rate.

Context

This research addresses the trade-off between coherence preservation and environmental renewal in quantum memory and transport, providing a microscopic benchmark for particle transport and energetic exchange.

Limitations

The model relies on exact finite-chain calculations for biased structured reservoirs, and no general endpoint-vanishing theorem exists for the through-current at complete erasure.

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