For d-local n-qubit Hamiltonians the operator norm is bounded by a d-dependent constant times the max expectation over an A-independent set of (1+ε)^n product states.
Anschuetz, David Gamarnik, Bobak T
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Approximating the operator norm of local Hamiltonians via few quantum states
For d-local n-qubit Hamiltonians the operator norm is bounded by a d-dependent constant times the max expectation over an A-independent set of (1+ε)^n product states.