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Seminar
FIELD Computational Sciences
DATE October 07 (Thu), 2021
TIME 15:00-18:00
PLACE 1503
SPEAKER Moon, Eun Gook
HOST Son, Young-Woo
INSTITUTE KAIST
TITLE Advancing Hybrid Quantum-Classical Algorithms via Mean-Operators
ABSTRACT

Entanglement in quantum many-body systems is the key concept for future technology and science, opening up a possibility to explore uncharted realms in an enormously large Hilbert space. The hybrid quantum-classical algorithms have been suggested to control quantum entanglement of many-body systems, and yet their applicability is intrinsically limited by the numbers of qubits and quantum operations. Here we propose a theory which overcomes the limitations by combining advantages of the hybrid algorithms and the standard mean-field-theory in condensed matter physics, named as mean-operator-theory. We demonstrate that the number of quantum operations to prepare an entangled target many-body state such as symmetry-protected-topological states is significantly reduced by introducing a mean-operator. We also show that a class of mean-operators is expressed as time-evolution operators and our theory is directly applicable to quantum simulations with 87Rb neutral atoms or trapped 40Ca+ ions.

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