Constantin Cedillo Vayson de Pradenne

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quant-ph2026

Restrictions on non-Clifford fault tolerance and ruling out beyond-SQL quantum metrology

Constantin Cedillo Vayson de Pradenne, Ishaan Kannan, Harald Putterman +1

Quantum metrology promises a quadratic speedup over the standard quantum limit (SQL), but signal-aligned noise is expected to preclude this advantage in realistic settings. A poten…

quant-ph2026

Learning Hamiltonians at Long Times

Constantin Cedillo Vayson de Pradenne, Jordan Cotler, Hsin-Yuan Huang

We study the problem of learning an unknown $n$ -qubit Hamiltonian $H$ from $U = e^{- i H t}$ for a single time $t$ , where $t$ may be arbitrarily large. For broad families of local Ham…