Manipulation Of Individual Quantum Systems Research Articles

Quantum dot behavior in transition metal dichalcogenides nanostructures

Recently, transition metal dichalcogenides (TMDCs) semiconductors have been utilized for investigating quantum phenomena because of their unique band structures and novel electronic properties. In a quantum dot (QD), electrons are confined in all lateral dimensions, offering the possibility for detailed investigation and controlled manipulation of individual quantum systems. Beyond the definition of graphene QDs by opening an energy gap in nanoconstrictions, with the presence of a bandgap, gate-defined QDs can be achieved on TMDCs semiconductors. In this paper, we review the confinement and transport of QDs in TMDCs nanostructures. The fabrication techniques for demonstrating two-dimensional (2D) materials nanostructures such as field-effect transistors and QDs, mainly based on e-beam lithography and transfer assembly techniques are discussed. Subsequently, we focus on transport through TMDCs nanostructures and QDs. With steady improvement in nanoscale materials characterization and using graphene as a springboard, 2D materials offer a platform that allows creation of heterostructure QDs integrated with a variety of crystals, each of which has entirely unique physical properties.

"Seeking the Light in a Cavity" in Conversation with Nobel Laureate Serge Haroche

Serge Haroche, Chair in Quantum Physics at the College de France. Professor Haroche was awarded the 2012 Nobel Prize for Physics for "groundbreaking experimental methods that enable measuring and manipulation of individual quantum systems". On 22 April 2013, the first day of the Berge Fest Conference, Professor Haroche delivered a talk on "Controlling photons in cavities". He reviewed recent experiments in Cavity QED in which his group count trapped microwave photons non-destructively and used quantum feedback methods to stabilize the photon number to a preset value. Further developments of these experiments were also discussed in his talk. The editorial team of Asia Pacific Physics Newsletter interviewed Professor Haroche during the Berge Fest Conference on 24 April 2014. For more information of the Berge Fest Conference, please visit http://bergefest.quantumlah.org/

Switchable magnetic bottles and field gradients for particle traps

Versatile methods for the manipulation of individual quantum systems, such as confined particles, have become central elements in current developments in precision spectroscopy, frequency standards, quantum information processing, quantum simulation, and alike. For atomic and some subatomic particles, both neutral and charged, a precise control of magnetic fields is essen- tial. In this paper, we discuss possibilities for the creation of specific magnetic field configurations which find appli- cation in these areas. In particular, we pursue the idea of a magnetic bottle which can be switched on and off by transition between the normal and the superconducting phase of a suitable material in cryogenic environments, for example in trap experiments in moderate magnetic fields. Methods for a fine-tuning of the magnetic field and its linear and quadratic components in a trap are presented together with possible applications.

The 2012 nobel prize in physics

The 2012 Nobel Prize in Physics has been awarded jointly to Serge Haroche and David J Wineland “for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems”. In this article, we discuss how the experiments of the two Laureates have taught us how to study single quantum particles — using photons to study single atoms in the case of Wineland, and using atoms to study single photons in the case of Haroche. Their work may some day lead to a superfast quantum computer.

O Prêmio Nobel de Física de 2012

In this article we will talk about the 2012 Nobel Prize in Physics, awarded to the physicists, the french man Serge Haroche and the north-american David Geffrey Wineland for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems.

Interview with 2012 Nobel Prize Winner Serge Haroche

Serge Haroche, Chair in Quantum Physics at the College de France, won a share of the Nobel Prize in Physics 2012. Before the prize was announced, the Centre for Quantum Technologies (CQT) at the National University of Singapore had invited him to contribute to its 2012 annual report. This was after he delivered his prestigious College de France lecture series in Singapore in 2012. The Q&A was published in full on CQT's website and is reproduced here with permission. Serge Haroche was awarded the Nobel Prize in Physics 2012 "for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems."

2012年度ノーベル物理学賞：S. Haroche氏，D. J. Wineland氏 ―個々の量子系に対する計測と操作を可能にする画期的な実験的手法 (学界ニュース)

2012年度ノーベル物理学賞：S. Haroche氏，D. J. Wineland氏 ―個々の量子系に対する計測と操作を可能にする画期的な実験的手法 (学界ニュース)

Sistemas cuánticos individuales

The Nobel Prize in Physics for 2012 was awarded to Serge Haroche and David J. Wineland “for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems”. The former deals with photons and measures them with atoms and the latter deals with ions and manipulates them with photons. The potential and actual applications of handling quantum systems are on their way to revolutionize not only technology but the way we understand the microscopic world.

Nobel Prize 2012: Haroche & Wineland

The 2012 Nobel Prize in Physics has been awarded to Serge Haroche and David J. Wineland "for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems".

Serge Haroche and David Wineland share this year's Nobel Prize in Physics

The two quantum opticians are honored for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems.

Nobel 2012: trapped ions and photons

18 What are these methods, why are they jointly recognized? The key endeavour in the last century of quantum physics has been the exploration of the coupling between matter and electromagnetic radiation. For a long time, the available experimental techniques were limited to a large number of atoms and a very large number of photons. It was only in thought experiments that one envisioned the manipulation of well-controlled individual quantum systems, dreamed of experimenting with a single atom or a single photon. For instance, Einstein and Bohr once imagined weighing a photon trapped forever in a box, covered by perfect mirrors. These gedankenexperiments and their “ridiculous consequences”, as Schrodinger once stated, played a considerable role in the genesis of quantum physics interpretation. The technical progress made these experiments possible. One can now realize some of the founding fathers' thought experiments. D. Wineland's ion traps and S. Haroche's Cavity Quantum Electrodynamics (CQED) have pioneered this domain, which is now thriving worldwide. The 2012 Nobel prize in physics has been awarded jointly to Serge Haroche (College de France and Ecole Normale Superieure) and David Wineland (National Institute for Standards and Technology, USA) “for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems”. l Michel Brune1, Jean-Michel Raimond1, Claude Cohen-Tannoudji 1,2 DOI: 10.1051/epn/2012601 l 1 Laboratoire Kastler Brossel, ENS, CNRS, UMPC Paris 6, 24 rue Lhomond, 75005 Paris, France l 2 College de France, 11 place Marcelin Berthelot, 75005 Paris, France Nobel 2012: Trapped ions and photons

Optical determination and magnetic manipulation of a single nitrogen-vacancy color center in diamond nanocrystal

The controlled and coherent manipulation of individual quantum systems is fundamental for the development of quantum information processing. The nitrogen-vacancy (NV) color center in diamond is a promising system since its photoluminescence is perfectly stable at room temperature and its electron spin can be optically read out at the individual level. We review here the experiments currently realized in our laboratory concerning the use of a single NV color center as the single photon source and the coherent magnetic manipulation of the electron spin associated with a single NV color center. Furthermore, we demonstrate a nanoscopy experiment based on the saturation absorption effect, which allows to optically pin-point a single NV color center at sub-λ resolution. This offers the possibility to independently address two or multiple magnetically coupled single NV color centers, which is a necessary step towards the realization of a diamond-based quantum computer.

Coherent Quantum Optical Control with Subwavelength Resolution

We suggest a new method for quantum optical control with nanoscale resolution. Our method allows for coherent far-field manipulation of individual quantum systems with spatial selectivity that is not limited by the wavelength of radiation and can, in principle, approach a few nanometers. The selectivity is enabled by the nonlinear atomic response, under the conditions of electromagnetically induced transparency, to a control beam with intensity vanishing at a certain location. Practical performance of this technique and its potential applications to quantum information science with cold atoms, ions, and solid-state qubits are discussed.