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GENERATING MIXED STATES AND FINITE-TEMPERATURE EQUILIBRIUM STATES OF QUANTUM SYSTEMS
GENERATING MIXED STATES AND FINITE-TEMPERATURE EQUILIBRIUM STATES OF QUANTUM SYSTEMS
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机译：产生混合状态和量子系统的有限温度平衡状态
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摘要
Methods, systems, and apparatus for preparing a target mixed state of a quantum system. In some aspects a method includes preparing a parameterized ansatz quantum state as an initial approximation to the target mixed state, wherein the parameterized ansatz quantum state comprises a first set of variational parameters and a second set of variational parameters; determining, by classical and quantum computation, values of the first set of variational parameters and second set of variational parameters that minimize a quantum relative entropy of the target mixed state with respect to the parameterized ansatz quantum state; and preparing the parameterized ansatz quantum state with the determined values of the first set of variational parameters and second set of variational parameters as a final approximation to the target mixed state.
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