近期活动

Colloquium

Quantum information experiments using few electrons in semiconductor quantum dots

Dohun Kim, Assistant Professor, Seoul National University
Wed, 2018-06-06 15:00 - 16:00
物理楼111报告厅

The charge and spin degrees of freedom of an electron constitute natural bases for constructing quantum two level systems, or qubits, in semiconductor quantum dots. The quantum dot charge qubit offers a simple architecture and high-speed operation, but generally suffers from fast dephasing due to strong coupling of the environment to the electron’s charge. On the other hand, quantum dot spin qubits have demonstrated long coherence times, but their manipulation is often slower than desired for important future applications. This talk will review experimental progress of fast semiconductor based quantum qubits, including single dot spin qubits, charge qubits and recently developed ‘hybrid’ qubits formed by three electrons in Si/SiGe double quantum dots or GaAs. Starting from discussing general introduction to quantum transport measurements in quantum dots, circuit design, and material issues for developing highly coherent qubits, the talk will focus on discussing implementations of advanced quantum measurement and validation protocols, largely adopting techniques developed in superconducting qubits and nuclear magnetic resonance research fields.

Dohun Kim graduated from University of Maryland in 2013 with the PhD degree, and spent two years working as a postdoc in University of Wisconsin. He is currently the assistant professor of Seoul National University. His research interests include Experimental quantum computing, Quantum transport, Quantum information science, Spin qubits, Spin transports and spin dynamics.

Host: Canhua Liu