Approaching the Limit of Quantum Clock Precision

• URL: http://arxiv.org/abs/2604.22704v1
• Date: Fri, 24 Apr 2026 16:35:52 GMT
• Title: Approaching the Limit of Quantum Clock Precision
• Abstract summary: We build a blueprint for a quantum clock governed by time-independent interactions.<n>We introduce a sudden-quench protocol that enables repeated operation.<n>Remarkably, the protocol is robust to imprecise detachment timing.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Precise and autonomous clocks are of fundamental interest and central importance to both foundational studies and practical applications. Here, we construct a blueprint for a quantum clock governed by time-independent interactions. By carefully-engineered coherent transport in dissipative spin chains, we achieve a scaling exponent at the precision-resolution trade-off fundamental bound, bringing this within reach of physically realistic and experimentally accessible systems. We further introduce a sudden-quench protocol that enables repeated operation through a simple initialization and detachment mechanism. Remarkably, the protocol is robust to imprecise detachment timing, implying that high-precision timekeeping can be achieved even when driven by a clock with much lower precision.

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