Sequential Capacity of Quantum Processes with Finite Memory
How complex can the responses of a quantum device become as it runs longer with a fixed internal memory? We quantify this complexity through sequential response capacity: how many adaptive testing stages, each using a fresh run, can continue to separate possible processes by a prescribed gap in response probabilities. For fixed system and memory sizes, we establish a tight law relating this capacity to run length and probability resolution. At fixed resolution, the capacity grows on the order of $K\log K$, where $K$ is the number of time steps in each run. Our construction attains this growth using time-dependent phase rotations on a single visible qubit with no additional internal memory...
| Authors | Yibin Wang |
|---|---|
| Primary category | quant-ph |
| Published | 1 October 2026 |
| Last updated at source | 6 October 2026 |
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