Entropic uncertainty under indefinite causal order and input-output direction

• URL: http://arxiv.org/abs/2511.14192v1
• Date: Tue, 18 Nov 2025 06:57:50 GMT
• Title: Entropic uncertainty under indefinite causal order and input-output direction
• Authors: Göktuğ Karpat,
• Abstract summary: We show that feeding Pauli channels into the quantum switch and the quantum time-flip can significantly reduce the total entropic uncertainty.<n>Our results reveal that indefinite causal order and input-output direction can serve as resources to mitigate the effects of noise.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Entropic uncertainty relations quantify the limits on the predictability of quantum measurements. When the measured system is correlated with a quantum memory, these limits are described by the memory-assisted entropic uncertainty relation (MA-EUR). We examine the behavior of MA-EUR when the memory qubit undergoes noisy dynamics implemented via high-order controlled processes, namely, the quantum switch and the quantum time-flip. We consider a setting in which the control qubit is the very system on which the measurements are performed, while the target qubit serves as a noisy quantum memory. Focusing on Pauli channels, we show that feeding them into the quantum switch and the quantum time-flip can significantly reduce the total entropic uncertainty as compared to their direct application. Our results reveal that indefinite causal order and input-output direction can serve as resources to mitigate the effects of noise in the context of MA-EUR and its applications.

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