Manipulation of a Single Charge in a Double Quantum Dot

Petta, J. R.; Johnson, A. C.; Marcus, C. M.; Hanson, M.; Gossard, A. C.

doi:10.1103/physrevlett.93.186802

Cited by 407 publications

(457 citation statements)

References 23 publications

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“…We use the material parameters of GaAs, i.e., the effective mass m * = 0.067 m e and the dielectric constant ε = 12.4. Inspired by the realistic experimental setup of coupled quantum dots [10], we propose a model potential composed by a double well…”

Section: A Modelmentioning

confidence: 99%

“…Since the seminal Letter of Grossmann et al [8] a number of theoretical and experimental works have addressed the issue of controlling the localization of an electron state in a double well potential [9][10][11][12][13][14][15][16][17][18][19][20][21][22]. These various control strategies include the use of analytically wellestablished phenomena like the paradigmatic LandauZener (LZ) transition [12][13][14], Landau-Zener-Stückelberg interferometry [15,16], the composite pulse (CP) protocol and several other two-level control strategies [12,[24][25][26][27], and OCT [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…These various control strategies include the use of analytically wellestablished phenomena like the paradigmatic LandauZener (LZ) transition [12][13][14], Landau-Zener-Stückelberg interferometry [15,16], the composite pulse (CP) protocol and several other two-level control strategies [12,[24][25][26][27], and OCT [18][19][20][21][22][23]. For the experimental control strategies, as can be seen in [10,[15][16][17], the first stage is the measurement of the charge stability diagram (CSD). This diagram characterizes the electron localization as functions of the gate voltages [7] and therefore initializes the scenario for the control strategy.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Controlled high-fidelity navigation in the charge stability diagram of a double quantum dot

Coden¹,

Romero²,

Räsänen³

2015

J. Phys.: Condens. Matter

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We propose an efficient control protocol for charge transfer in a double quantum dot. We consider numerically a two-dimensional model system, where the quantum dots are subjected to timedependent electric fields corresponding to experimental gate voltages. Our protocol enables navigation in the charge stability diagram from a state to another through controllable variation of the fields. We show that the well-known adiabatic Landau-Zener transition -when supplemented with a time-dependent field tailored with optimal control theory -can remarkably improve the transition speed. The results also lead to a simple control scheme that requires only a single parameter obtained from the experimental charge stability diagram. Eventually, we can control the system at the fastest speed allowed by the quantum dynamics and with a high fidelity.

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Section: A Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Controlled high-fidelity navigation in the charge stability diagram of a double quantum dot

Coden¹,

Romero²,

Räsänen³

2015

J. Phys.: Condens. Matter

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“…Coherent quantum control of electrons in quantum dots exposed to electromagnetic radiation is of great interest in many technological applications from charge transport devices to quantum information [16,17,18]. Several studies in quantum control of double quantum dots (DQDs) has been performed using gate voltages and optimized laser pulses [19,20,21].…”

Section: Introductionmentioning

confidence: 99%

Optimal control of a charge qubit in a double quantum dot with a Coulomb impurity

Coden

Romero

Ferrón

et al. 2017

Physica E: Low-dimensional Systems and Nanostructures

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Abstract. We study the efficiency of modulated laser pulses to produce efficient and fast charge localization transitions in a two-electron double quantum dot. We use a configuration interaction method to calculate the electronic structure of a quantum dot model within the effective mass approximation. The interaction with the electric field of the laser is considered within the dipole approximation and optimal control theory is applied to design high-fidelity ultrafast pulses in pristine samples. We assessed the influence of the presence of Coulomb charged impurities on the efficiency and speed of the pulses. A protocol based on a two-step optimization is proposed for preserving both advantages of the original pulse. The processes affecting the charge localization is explained from the dipole transitions of the lowest lying two-electron states, as described by a discrete model with an effective electron-electron interaction.

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“…2,3 For spin states in quantum dots, however, all single-shot readout schemes used so far are destructive. Either the spin is always left in the ground state, 4 or the number of electrons in the dot is changed as a result of the measurement.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive measurement of electron spins in a quantum dot

et al. 2006

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We propose and implement a nondestructive measurement that distinguishes between two-electron spin states in a quantum dot. In contrast to earlier experiments with quantum dots, the spins are left behind in the state corresponding to the measurement outcome. By measuring the spin states twice within a time shorter than the relaxation time T 1 , correlations between the outcomes of consecutive measurements are observed. They disappear as the wait time between measurements becomes comparable to T 1 . The correlation between the postmeasurement state and the measurement outcome is measured to be ϳ90% on average.

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Manipulation of a Single Charge in a Double Quantum Dot

Cited by 407 publications

References 23 publications

Controlled high-fidelity navigation in the charge stability diagram of a double quantum dot

Controlled high-fidelity navigation in the charge stability diagram of a double quantum dot

Optimal control of a charge qubit in a double quantum dot with a Coulomb impurity

Nondestructive measurement of electron spins in a quantum dot

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