사이트 토토/BK21 SEMINAR[09.08.05]
관련링크
본문
"
Readout of single electron 사이트 토토s in a micro-magnet
Double-quantum-dot using charge sensing techniques
ØSpeaker : Dr. Yun-Sok Shin [Tokyo University]
ØPlace : 사이트 토토 Seminar Room (Science Bldg, 3-201)
ØDate & Time : Aug, 5 (Wed), 16:00 ~ 17:00 pm
Abstract
Electron 사이트 토토s in semiconductors has been attracted in recent research of quantum information
processing by their long coherence and scalability [1,2]. An individual electron 사이트 토토 provides two
quantum states implementing a quantumbit (qubit), fundamental unit of quantum computers.
Realization of qubits requires to manipulate and readout 사이트 토토s. Magnetic resonance was recently
demonstrated to coherently manipulate individual electron 사이트 토토s in semiconductor quantum dots.
As for 사이트 토토 readout, single-shot readout has been experimentally realized in a QD by 사이트 토토-to-charge
conversion scheme [3,4] and the readout of 사이트 토토s in a double quantum dot (DQD) has been
theoretically proposed in various ways.
Photon assisted tunneling (PAT) is a powerful technique to readout the 사이트 토토. PAT allows selective
resonance tunneling of the 사이트 토토 when plunged in a slanting Zeeman field. In order to realize 사이트 토토 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 사이트 토토 degeneracy of PAT between the
two dots. Matching the frequency of PAT enables either 사이트 토토-up or 사이트 토토-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 사이트 토토 readout in a micro-magnet DQD. We observed the PAT transitions
between two states with the same 사이트 토토 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 사이트 토토 addressable as a
function of external magnetic fields.
Contact Person : Prof. Hu-Jong Lee(054-279-2072, hjlee@postech.ac.kr)"
Readout of single electron 사이트 토토s in a micro-magnet
Double-quantum-dot using charge sensing techniques
ØSpeaker : Dr. Yun-Sok Shin [Tokyo University]
ØPlace : 사이트 토토 Seminar Room (Science Bldg, 3-201)
ØDate & Time : Aug, 5 (Wed), 16:00 ~ 17:00 pm
Abstract
Electron 사이트 토토s in semiconductors has been attracted in recent research of quantum information
processing by their long coherence and scalability [1,2]. An individual electron 사이트 토토 provides two
quantum states implementing a quantumbit (qubit), fundamental unit of quantum computers.
Realization of qubits requires to manipulate and readout 사이트 토토s. Magnetic resonance was recently
demonstrated to coherently manipulate individual electron 사이트 토토s in semiconductor quantum dots.
As for 사이트 토토 readout, single-shot readout has been experimentally realized in a QD by 사이트 토토-to-charge
conversion scheme [3,4] and the readout of 사이트 토토s in a double quantum dot (DQD) has been
theoretically proposed in various ways.
Photon assisted tunneling (PAT) is a powerful technique to readout the 사이트 토토. PAT allows selective
resonance tunneling of the 사이트 토토 when plunged in a slanting Zeeman field. In order to realize 사이트 토토 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 사이트 토토 degeneracy of PAT between the
two dots. Matching the frequency of PAT enables either 사이트 토토-up or 사이트 토토-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 사이트 토토 readout in a micro-magnet DQD. We observed the PAT transitions
between two states with the same 사이트 토토 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 사이트 토토 addressable as a
function of external magnetic fields.
Contact Person : Prof. Hu-Jong Lee(054-279-2072, hjlee@postech.ac.kr)"
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