토토 승무패PHYSICS/BK21 SEMINAR[09.08.20]
관련링크
본문
"
Readout of single electron 토토 사이트 커뮤니티s in a micro-magnet
Double-quantum-dot using charge sensing techniques
ØSpeaker :토토 사이트 커뮤니티Dr. Yun-Sok Shin [Tokyo University]
ØPlace : 토토 사이트 커뮤니티 Seminar Room (Science Bldg, 3-201)
ØDate & Time :토토 사이트 커뮤니티Aug, 5 (Wed), 16:00 ~ 17:00 pm
Abstract
Electron 토토 사이트 커뮤니티s in semiconductors has been attracted in recent research of quantum information
processing by their long coherence and scalability [1,2]. An individual electron 토토 사이트 커뮤니티 provides two
quantum states implementing a quantumbit (qubit), fundamental unit of quantum computers.
Realization of qubits requires to manipulate and readout 토토 사이트 커뮤니티s. Magnetic resonance was recently
demonstrated to coherently manipulate individual electron 토토 사이트 커뮤니티s in semiconductor quantum dots.
As for 토토 사이트 커뮤니티 readout, single-shot readout has been experimentally realized in a QD by 토토 사이트 커뮤니티-to-charge
conversion scheme [3,4] and the readout of 토토 사이트 커뮤니티s in a double quantum dot (DQD) has been
theoretically proposed in various ways.
Photon assisted tunneling (PAT) is a powerful technique to readout the 토토 사이트 커뮤니티. PAT allows selective
resonance tunneling of the 토토 사이트 커뮤니티 when plunged in a slanting Zeeman field. In order to realize 토토 사이트 커뮤니티 readout,
we adopt a double quantum dot configuration with a quantum point contact (QPC) for non-destructive
charge sensing readout. The stray magnetic field from the micro-magnet integrated with the DQD
provides different Zeeman energies for each dot. This lifts off the 토토 사이트 커뮤니티 degeneracy of PAT between the
two dots. Matching the frequency of PAT enables either 토토 사이트 커뮤니티-up or 토토 사이트 커뮤니티-down electron to transit from
one dot to the other. The PAT-induced charge delocalization within the double-dot is then detected by
the QPC charge sensor.
We demonstrated continuous 토토 사이트 커뮤니티 readout in a micro-magnet DQD. We observed the PAT transitions
between two states with the same 토토 사이트 커뮤니티 of the two-dot with charge sensing techniques. The PAT shows
the two peaks as a function of the microwave frequency, whose difference is consistent with the
estimated Zeeman energy from the micro-magnet. These PAT transitions are 토토 사이트 커뮤니티 addressable as a
function of external magnetic fields.
Contact Person : Prof. Hu-Jong Lee(054-279-2072,토토 사이트 커뮤니티hjlee@postech.ac.kr)"
Readout of single electron 토토 사이트 커뮤니티s in a micro-magnet
Double-quantum-dot using charge sensing techniques
ØSpeaker :토토 사이트 커뮤니티Dr. Yun-Sok Shin [Tokyo University]
ØPlace : 토토 사이트 커뮤니티 Seminar Room (Science Bldg, 3-201)
ØDate & Time :토토 사이트 커뮤니티Aug, 5 (Wed), 16:00 ~ 17:00 pm
Abstract
Electron 토토 사이트 커뮤니티s in semiconductors has been attracted in recent research of quantum information
processing by their long coherence and scalability [1,2]. An individual electron 토토 사이트 커뮤니티 provides two
quantum states implementing a quantumbit (qubit), fundamental unit of quantum computers.
Realization of qubits requires to manipulate and readout 토토 사이트 커뮤니티s. Magnetic resonance was recently
demonstrated to coherently manipulate individual electron 토토 사이트 커뮤니티s in semiconductor quantum dots.
As for 토토 사이트 커뮤니티 readout, single-shot readout has been experimentally realized in a QD by 토토 사이트 커뮤니티-to-charge
conversion scheme [3,4] and the readout of 토토 사이트 커뮤니티s in a double quantum dot (DQD) has been
theoretically proposed in various ways.
Photon assisted tunneling (PAT) is a powerful technique to readout the 토토 사이트 커뮤니티. PAT allows selective
resonance tunneling of the 토토 사이트 커뮤니티 when plunged in a slanting Zeeman field. In order to realize 토토 사이트 커뮤니티 readout,
we adopt a double quantum dot configuration with a quantum point contact (QPC) for non-destructive
charge sensing readout. The stray magnetic field from the micro-magnet integrated with the DQD
provides different Zeeman energies for each dot. This lifts off the 토토 사이트 커뮤니티 degeneracy of PAT between the
two dots. Matching the frequency of PAT enables either 토토 사이트 커뮤니티-up or 토토 사이트 커뮤니티-down electron to transit from
one dot to the other. The PAT-induced charge delocalization within the double-dot is then detected by
the QPC charge sensor.
We demonstrated continuous 토토 사이트 커뮤니티 readout in a micro-magnet DQD. We observed the PAT transitions
between two states with the same 토토 사이트 커뮤니티 of the two-dot with charge sensing techniques. The PAT shows
the two peaks as a function of the microwave frequency, whose difference is consistent with the
estimated Zeeman energy from the micro-magnet. These PAT transitions are 토토 사이트 커뮤니티 addressable as a
function of external magnetic fields.
Contact Person : Prof. Hu-Jong Lee(054-279-2072,토토 사이트 커뮤니티hjlee@postech.ac.kr)"
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