QUANTUM INFORMATION PROCESSING METHOD, CLASSIC COMPUTER, QUANTUM COMPUTER, QUANTUM INFORMATION PROCESSING PROGRAM, AND DATA STRUCTURE FOR OBTAINING DIFFERENTIAL OF ENERGY

To obtain a derivative of energy when performing quantum computation of energy of a system by using VQE(Variational-Quantum-Eigensolver).SOLUTION: A quantum computer 120 executes quantum computation using VQE in accordance with a Hamiltonian and initial information which are outputted from a classic...

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Bibliographic Details
Main Authors MITARAI KOSUKE, NAKAGAWA HIRONARI
Format Patent
LanguageEnglish
Japanese
Published 19.11.2020
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Summary:To obtain a derivative of energy when performing quantum computation of energy of a system by using VQE(Variational-Quantum-Eigensolver).SOLUTION: A quantum computer 120 executes quantum computation using VQE in accordance with a Hamiltonian and initial information which are outputted from a classic computer 110, to generate a parameter representing a first quantum circuit. The classic computer 110 generates a parameter representing a second quantum circuit including a rotating gate in accordance with the parameter representing the first quantum circuit. Then, the quantum computer 120 executes quantum computation according to the parameter representing the second quantum circuit to output a measurement result of the quantum computation. The classic computer 110 computes a derivative of energy corresponding to the Hamiltonian in accordance with the measurement result, the Hamiltonian, and a derivative of the Hamiltonian to output the derivative of energy.SELECTED DRAWING: Figure 1 【課題】VQE(Variational-Quantum-Eigensolver)を用いて系のエネルギーを量子計算する際にエネルギーの導関数を得る。【解決手段】量子コンピュータ120が、古典コンピュータから出力された、ハミルトニアンと初期情報とに応じて、VQEを用いた量子計算を実行し、第1の量子回路を表すパラメータを生成する。そして、古典コンピュータ110が、第1の量子回路を表すパラメータに応じて、回転ゲートを含む第2の量子回路を表すパラメータを生成する。そして、量子コンピュータ120が、第2の量子回路を表すパラメータに応じた量子計算を実行し、量子計算の測定結果を出力する。古典コンピュータ110が、測定結果とハミルトニアンとハミルトニアンの導関数とに応じて、ハミルトニアンに対応するエネルギーの導関数を計算し、エネルギーの導関数を出力する。【選択図】図1
Bibliography:Application Number: JP20190090332