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