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quant-ph2026
Beyond Light Cones: State Preparation Complexity in Quantum Spin Glasses
Omar Al-Ghattas, David Gamarnik, Bobak T Kiani
We introduce a method for studying state preparation complexity in dense quantum -spin Hamiltonians on qubits, going beyond bounds based only on circuit lightcones. The key…
quant-ph2026
Sharp universal death of entanglement threshold for Pauli Hamiltonians
Bobak T. Kiani
We determine the exact universal high-temperature separability threshold for Pauli Hamiltonians of bounded degree . If every coefficient in the Hamiltonian has magnitude at…
quant-ph2026
SYK thermal expectations are classically easy at any temperature
Alexander Zlokapa, Bobak T. Kiani
Estimating thermal expectations of local observables is a natural target for quantum advantage. We give a simple classical algorithm that approximates thermal expectations for Gibb…