Theory of single-photon induced deterministic quantum-state operation in one-dimensional optical systems

2015 Fiscal Year Final Research Report

• Project/Area Number: 25400417
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Tokyo Medical and Dental University
• Principal Investigator: Koshino Kazuki 東京医科歯科大学, 教養部, 准教授 (90332311)
• Co-Investigator(Renkei-kenkyūsha): NAKAMURA Yasunobu 東京大学, 先端科学技術研究センター, 教授 (90524083) ; TAKEUCHI Shigeki 京都大学, 大学院工学研究科, 教授 (80321959)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 量子状態操作 / マイクロ波量子光学 / 量子情報 / 超伝導回路ＱＥＤ / 着衣状態 / 量子ダイナミクス

Outline of Final Research Achievements

When a Lambda-type three-level system having identical radiative decay rates reflects a single photon propagating in one-dimensional waveguide, it is known that a resonant single photon deterministically switches the quantum state of the Lambda system (impedance-matched Lambda system). In this project, we theoretically showed that such a Lambda system can be implemented by driving a superconducting artificial atom coupled dispersively to a microwave resonator, and clarified the drive conditions. We also showed that such a Lambda system is applicable for a microwave single-photon detector. These predictions are confirmed experimentally: we realized a microwave single-photon detector whose quantum efficiency reaches 66%.

Free Research Field

量子光学(理論)