Real-Time Decoherence Telemetry and Dynamic Gate Scheduling in Shared Quantum Execution Environments

Abstract: Cryogenic fluctuations, two-level system (TLS) defects, and flux noise cause stochastic drifts in qubit coherence lifetimes. This paper presents an autonomous telemetry loop integrated into the quantum hypervisor that dynamically remaps active circuits to higher-fidelity physical qubits without job restart.

1. Two-Level System (TLS) Resonance Tracking

Dielectric defects in Josephson junctions fluctuate in frequency over hours, periodically intersecting qubit operational frequencies and collapsing T1 relaxation times from 150 µs down to 20 µs. The hypervisor continuously monitors continuous Ramsey fringe decay to detect TLS intersections and dynamically recalibrates microwave drive frequencies.

2. Live Virtual Qubit Migration Across the QPU Plane

When a physical qubit exhibits degraded fidelity, the hypervisor injects a sequence of fault-tolerant SWAP gates or lattice surgery boundary extensions to migrate the active logical state to a calibrated adjacent sector, maintaining continuous algorithmic execution without losing entangled state memory.

3. Telemetry Results and Quantum Volume Preservation

Benchmarking across continuous 72-hour stress runs demonstrates that decoherence-aware telemetry preserves quantum volume metrics above 2^10, whereas unmanaged static schedules experience random fidelity drops averaging a 42% degradation across identical workloads.

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