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This theoretical paper addresses how to reset open fermionic quantum systems while keeping their coherence, a step relevant to quantum memory and reset operations. Its key result is that coherence and bath populations cannot be tuned independently, so any protocol must modify both to yield physically valid states. The findings are analytical and based on finite open chains, so they still need experimental validation before practical impact on quantum hardware can be judged.
Researchers Link Coherence Retention to Faster Quantum Transfer
Quantum reset protocols routinely fail because they overlook a fundamental link between information retention and environmental adjustments. This work demonstrates that preserving quantum coherences, essential for memory and transfer rates, requires simultaneously modifying bath populations and correlations to avoid generating physically unrealistic states. A new two-reservoir protocol overcomes this limitation by ensuring complete positivity within quadratic dynamics, revealing previously hidden constraints on energy flow and control.
The study investigates memory and transport processes in open quantum systems. A straightforward replacement of bath occupations while maintaining arbitrary system, bath coherences does not guarantee a physically realizable fermionic state. Instead, researchers construct a two-reservoir protocol utilising independent, number-conserving thermal attenuators which ensures complete positivity and fermionic admissibility by design. Physical attenuation inherently alters both bath populations and cross…
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