Quantum control of individual spins in quantum dots coupled with a resonator

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H02015
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Applied materials
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: ISHIBASHI Koji 国立研究開発法人理化学研究所, 石橋極微デバイス工学研究室, 主任研究員 (30211048)
• Co-Investigator(Renkei-kenkyūsha): DEACON S. Russell 国立研究開発法人理化学研究所, 石橋極微デバイス工学研究室, 専任研究員 (40552443) ; WANG Rui 国立研究開発法人理化学研究所, 石橋極微デバイス工学研究室, 客員研究員 (20700967)
• Research Collaborator: Lieber Charles M. Harvard University ; Bakkers Erik P. A. M. TU Eindhoven
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: スピン共振器相互作用 / スピン軌道相互作用 / 半導体ナノワイア

Outline of Final Research Achievements

The spin-orbit interaction (SOI) was used to try to realize a strong interaction between individual spins in a quantum dots and a photon in a circuit resonator.The characteristic features of the SOI in the Ge/Si nanowires, such as the coherence length, spin relaxation time and their electric field dependence were studied by analyzing the magnetoresistance due to the anti-weak localization.
We have developed a technique to locate the quantum dots in a microwave coplanar waveguide superconducting resonator, and the resonator responses were measured in a mili-Kelvin temepratures, depending on the charge states and the coupling strength between the double dots. Unfortunately, the strong coherent coupling was not observed. It was found that it was because the decoherence in the quantum dots were very large compared with the coupling between the dots and the resonator.

Free Research Field

ナノデバイス工学