Learning the Hamiltonian of a many-body system from its dynamics is a central task in quantum science, yet the algorithms with the strongest provable guarantees assume some level of quantum control--fast, arbitrary single-qubit gates interleaved with time evolution, and measurements in arbitrary bases--that is beyond t...
W. Gong, Mu-Zhou Ma, Si-Tan Chen et al.· 0 citations
Quantum technology has the potential to transform scientific discovery, but quantum advantages often require processing capabilities well beyond the reach of experimental platforms. We show that coupling a single controllable qubit to an otherwise conventional sensor can exponentially reduce the number of measurements...
Ishaan Kannan, Sridhar Prabhu, Saeed A. Khan et al.· 5 citations
At high temperature, quantum Gibbs states retain several classical features of the maximally mixed state: the absence of entanglement, the absence of magic, analyticity of the partition function, correlation decay, and algorithmic tractability. We prove new and sharp bounds showing that these features persist down to f...
Harald Putterman, Alexander Zlokapa, Jordan Cotler· 3 citations· ⚡1
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