Influence of the stark effect on the resonance excitation transfer between quantum dots

Головинский, П. А.

doi:10.1134/s1063782614060104

Cited by 17 publications

(4 citation statements)

References 18 publications

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“…As we are going to show, logic gates could be performed by laser pulses with the same photon energy E L , detuned from individual dot resonances ( E L < E 1 , E 2 ), which significantly simplifies the experimental setup and reduces photobleaching (since detuned photons are not absorbed by nanocrystals). These laser pulses are designed to manipulate the Förster interaction ( V F ) between proximal dots through a Stark shift, Δ E Stark , resulting from the electric field of laser radiation. − The idea is to bring the system, initially prepared in the state |10⟩ into to a resonance with the neighboring dot, E 2 – E 1 = V F + Δ E Stark . This will induce Rabi oscillations between dots 1 and 2 and shift its eigenfunctions toward the state superposition: c 1 |10⟩ + c 2 |01⟩, c 1 |01⟩ – c 2 |10⟩.…”

Section: Resultsmentioning

confidence: 99%

Quantum Computing with Exciton Qubits in Colloidal Semiconductor Nanocrystals

et al. 2021

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The present work evaluates the feasibility of quantum computing with exciton qubits in coupled colloidal semiconductor nanocrystals (NCs). A strategy for manipulating twoqubit states of colloidal NC hetero-dimers is described. We show that a sequence of laser pulses with the same photon energy can bring excitonic states of a nanocrystal hetero-dimer into entanglement and perform arbitrary qubit rotations (quantum gates). Our simulations of a realistic two-particle assembly of CdSe/CdS core/shell NCs demonstrate that such two-qubit gate operations can be driven by optical parametric oscillators with a theoretical error of 0.1%. A strategy for upscaling two-qubit hetero-dimers to N-qubit exciton gates in semiconductor NC assemblies is discussed.

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Section: Resultsmentioning

confidence: 99%

Quantum Computing with Exciton Qubits in Colloidal Semiconductor Nanocrystals

et al. 2021

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“…(2) Недиагональные кулоновские матричные элементы описывают резонансный обмен квантом возбуждения между КТ 1 и КТ 2 без перемещения электрона (эффект Ферстера [18]):…”

Section: модель оптоэлектронной структуры и основные уравненияunclassified

Спектральный Отклик Микрорезонатора С Двумя Квантовыми Точками, Обусловленный Взаимодействием Между Локализованными Электронами

Цуканов¹

2022

Оптика И Спектроскопия

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A theoretical model of a semiconductor nanostructure consisting of a single-mode microresonator containing two quantum dots is considered. It is shown that the Coulomb interaction between electrons localized in the quantum dots modifies a spectral response of the system to an external laser field. The possibility of its use for detecting an elementary charge in the third (optically inactive) quantum dot is discussed. The influence of both diagonal (Stark effect) and non-diagonal (Förster effect) Coulomb matrix elements of the Hamiltonian on the detection accuracy is studied. The dependences of a measuring contrast on the parameters of the resonator and the quantum dots are calculated. The existence of such structural configurations for which the contrast retains an optimal value even at large distances to the measured dot is established.

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“…The first group is associated with energy shifts of the QD states caused by the interaction of electrons. The second group describes (a) resonant processes that cause energy transfer between two QDs without charge transfer (Förster effect) [21], and (b) virtual processes that lead to dynamic shifts of the QD states. The general expression for the Coulomb matrix elements in effective atomic units is given by the formula [22]:…”

Section: Spectroscopic Response Of An Array Of Single-electron Qds Co...mentioning

confidence: 99%

Optical measurement of a quantum dot state in a microdisk by a Stark transducer

Tsukanov¹,

Kateev²

2022

Laser Phys. Lett.

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A spectroscopic method for determining the number of electrons in a quantum dot (QD) located inside a microdisk resonator is proposed. A transducer with the form of a ring structure composed of single-electron QDs is an auxiliary element used to enhance the interaction of laser photons with the QD and with the microdisk. The microdisk parameters are calculated to ensure an efficient energy exchange between the disk modes and the transducer QDs. The influence of the Stark and Förster effects on the measurement accuracy is studied. The optimal measurement regime is shown to be achieved provided that both effects are compensated.

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Influence of the stark effect on the resonance excitation transfer between quantum dots

Cited by 17 publications

References 18 publications

Quantum Computing with Exciton Qubits in Colloidal Semiconductor Nanocrystals

Quantum Computing with Exciton Qubits in Colloidal Semiconductor Nanocrystals

Спектральный Отклик Микрорезонатора С Двумя Квантовыми Точками, Обусловленный Взаимодействием Между Локализованными Электронами

Optical measurement of a quantum dot state in a microdisk by a Stark transducer

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