Abstract: |
A hybrid quantum-classical (HQC) computer prepares a quantum Boltzmann machine (QBM) in a pure state. The state is evolved in time according to a chaotic, tunable quantum Hamiltonian. The pure state locally approximates a (potentially highly correlated) quantum thermal state at a known temperature. With the chaotic quantum Hamiltonian, a quantum quench can be performed to locally sample observables in quantum thermal states. With the samples, an inverse temperature of the QBM can be approximated, as needed for determining the correct sign and magnitude of the gradient of a loss function of the QBM. |
Inventor: |
Anschuetz, Eric R. (Cambridge, MA, US); Cao, Yudong (Cambridge, MA, US) |
Applicant: |
Zapata Computing, Inc. (Boston, MA, US) |
Face Assignee: |
N/A |
Filed: |
2019-10-24 |
Issued: |
2020-04-30 |
Claims: |
22 |
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US20200134502
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1. A hybrid quantum-classical computer, comprising:
(4)
(3)
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12. A method for preparing, by a hybrid quantum-classical computer, a state of a quantum Boltzmann machine that follows a probability distribution which locally approximates a Boltzmann distribution at a known temperature, the hybrid quantum-classical computer comprising:
(5)
(6)
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