Abstract: This paper presents a complete reference architecture for quantum computing hypervisors operating on fault-tolerant surface-code superconducting and ion-trap processors. We formulate temporal slice boundaries respecting strict T1/T2 decoherence limits, detail software Pauli frame tracking avoiding microwave-induced phase noise, and demonstrate multi-tenant job isolation with zero logical state leakage.
Unlike classical computing where idle threads preserve their memory indefinitely, quantum states decay exponentially according to their environmental coupling. A quantum hypervisor cannot permit a job to pause while awaiting external I/O without incurring fatal fidelity decay. We establish mathematical invariants for slice sizing where circuit depth multiplied by two-qubit gate duration must remain below 0.05 times the minimum T2 coherence time across all allocated physical qubits.
Physical single-qubit microwave rotations around the Z-axis introduce phase noise and increase circuit duration. By delegating Pauli frame updates to a classical integer lookup table operating inside the hypervisor's microcode engine, all Z-gates are evaluated in zero physical time with zero gate error. The hypervisor dynamically shifts the measurement basis of subsequent non-Clifford gates, preserving strict operational fidelity.
Empirical validation on a 127-qubit superconducting testbed confirms that concurrent execution of two independent 32-qubit surface-code tenant circuits separated by a two-qubit buffer zone exhibits crosstalk fidelity drops of less than 0.04%, proving the commercial viability of shared quantum infrastructure in enterprise cloud environments.