Coherent Optical Control of the Quantum State of a Single Quantum Dot

Bonadeo, N. H.; Erland, J.; Gammon, D.; Park, D.; Katzer, D. S.; Steel, Duncan G.

doi:10.1126/science.282.5393.1473

Cited by 608 publications

(365 citation statements)

References 37 publications

Supporting

Mentioning

353

Contrasting

Order By: Relevance

“…Generation of superposition states So far we have mostly discussed the influence of phonons on the occupation of the QD states. For applications of optically controlled QDs in quantum information processing it is also necessary to prepare a given superposition state, e.g., a superposition of ground and exciton state [19]. One way to create a superposition state is to use a Rabi rotation with a pulse area, which is not equal to a multiple of π.…”

Section: Rabi Rotationsmentioning

confidence: 99%

“…This compatibility with existing technologies makes QDs attractive candidates for a wide range of applications ranging from optoelectronic devices like QD lasers [1,2,3,4], where the target is an improved performance compared to other laser structures, up to new applications in the fields of quantum cryptography or quantum information processing, where the presence of discrete energy levels is mandatory. Examples of such quantum applications are single-photon sources [5,6,7,8,9,10], sources of entangled photon pairs [11,12,13,14,15,16,17,18], and qubit devices or quantum gates [19,20,21,22,23,24]. The functionality of all these latter applications relies on the preparation of a well-defined quantum state.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The role of phonons for exciton and biexciton generation in an optically driven quantum dot

Reiter

Kuhn

Glässl

et al. 2014

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Abstract. For many applications of semiconductor quantum dots in quantum technology a well controlled state preparation of the quantum dot states is mandatory. Since quantum dots are embedded in the semiconductor matrix, the interaction with phonons plays often a major role in the preparation process. In this review, we discuss the influence of phonons on three basically different optical excitation schemes which can be used for the preparation of exciton, biexciton, and superposition states: a resonant excitation leading to Rabi rotations in the excitonic system, an excitation with chirped pulses exploiting the effect of adiabatic rapid passage, and an off-resonant excitation giving rise to a phononassisted state preparation. We give an overview over experimental and theoretical results showing the role of the phonons and compare the performance of the schemes for state preparation.

show abstract

Section: Rabi Rotationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The role of phonons for exciton and biexciton generation in an optically driven quantum dot

Reiter

Kuhn

Glässl

et al. 2014

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…At low temperature, the artificial atom picture is strengthened by the long coherence times of an exciton in a quantum dot [3][4][5], motivating the application of quantum dots in quantum optics and quantum information processing. Excitons in quantum dots have already been manipulated coherently [6][7][8]. Whereas interactions of discrete quantum dot states and continuum states from the wetting layer are usually regarded as a source of incoherence [9], they can also give rise to a new type of coherent interaction [10].…”

Section: Introductionmentioning

confidence: 99%

Spin-Dependent Coupling of Charged Quantum Dot Excitons with Continuum States

et al. 2004

View full text Add to dashboard Cite

Magnetic field and temperature dependent photoluminescence studies on neutral and charged excitons in individual InAs quantum dots allow us to uncover different mechanisms by which the discrete quantum dot states are coupled to delocalized continuum states in a quantum well (the wetting layer). The behaviour of the neutral and singly charged excitons can be explained taking only discrete quantum dot states into account. For doubly and triply charged excitons we have to consider spin dependent coherent and incoherent interactions between discrete quantum dot states and delocalized wetting layer states.

show abstract

“…In the literature, we often find (A) theoretical proposals for future experiments [5,6] and (B) preliminary experiments [7,8,9] on simple coherent systems such as quantum point contacts, quantum dots, and Josephson junctions to examine issues of decoherence and their control. It should be pointed out that in contrast to [4], these do not involve control via the reservoir.…”

mentioning

confidence: 99%

Control of decoherence and correlation in single quantum dissipative oscillator systems

Rendell

Rajagopal

2001

Physics Letters A

View full text Add to dashboard Cite

A single quantum dissipative oscillator described by the Lindblad equation serves as a model for a nanosystem. This model is solved exactly by using the ambiguity function. The solution shows the features of decoherence (spatial extent of quantum behavior), correlation (spatial scale over which the system localizes to its physical dimensions), and mixing (mixedstate spatial correlation). A new relation between these length scales is obtained here. By varying the parameters contained in the Lindblad equation, it is shown that decoherence and correlation can be controlled. We indicate possible interpretation of the Lindblad parameters in the context of experiments using engineered reservoirs.A prototypical model of many physical systems is often the quantum dissipative oscillator. This model contains the physical ideas of decoherence, correlation, diffusion, etc. associated with quantum systems. This is especially pertinent in discussing quantum nanodevice systems, which are usually imbedded in other systems so that a suitable description of the environmental effects may be described in terms of the parameters of such a model. The equation governing the density matrix of this system is the Lindblad equation, which describes dissipative quantum systems in a consistent way; namely, its solution does not violate basic requirements of positive semi-definiteness, probability conservation, and hermiticity of the density matrix [1]. The purpose of this paper is to exhibit this model in general terms of a Gaussian density matrix, which contains all the above elements. The "ambiguity function" [2] introduced ori ginally in radar theory, defined as the Fourier transform in the center-of-mass coordinate of the density matrix is found to lead to solutions of the Lindblad's quantum dissipative oscillator. We use the solution so obtained in estimating the various physical features mentioned above. Other formal methods of analyzing these types of problem have been recently discussed in [3]. Finally, we draw some conclusions about the nanodevice characteristics and possibility of the control of decoherence and correlation in realistic situations. An example of this is an atom in a Paul trap coupled to engineered controllable reservoirs [4].In the literature, we often find (A) theoretical proposals for future experiments [5,6] and (B) preliminary experiments [7,8,9] on simple coherent systems such as quantum point contacts, quantum dots, and Josephson junctions to examine issues of decoherence and their control. It should be pointed out that in contrast to [4], these do not involve control via the reservoir. In this paper we discuss some of these in the same exploratory spirit.For simplicity of presentation, we focus our attention on a single, one-dimensional system. We define the time-dependent density matrix in the usual way:

show abstract

Coherent Optical Control of the Quantum State of a Single Quantum Dot

Cited by 608 publications

References 37 publications

The role of phonons for exciton and biexciton generation in an optically driven quantum dot

The role of phonons for exciton and biexciton generation in an optically driven quantum dot

Spin-Dependent Coupling of Charged Quantum Dot Excitons with Continuum States

Control of decoherence and correlation in single quantum dissipative oscillator systems

Contact Info

Product

Resources

About