PRESS-NEWS.org - Press Release Distribution
PRESS RELEASES DISTRIBUTION

Highly stable quantum light source for applications in quantum information developped

2013-11-04
(Press-News.org) Contact information: Richard Warburton
richard.warburton@unibas.ch
41-612-673-560
University of Basel
Highly stable quantum light source for applications in quantum information developped Physicists at the University of Basel have been successful in generating photons - the quantum particles of light – with only one color. This is useful for quantum information. The scientists have actively stabilized the wavelength of the photons emitted by a semiconductor thereby neutralizing the charge noise in the semiconductor. The results were developed in close collaboration with the Universities of Bochum, Paderborn and Lyon and have been published in the magazine «Physical Review X».

Light consists of quantum particles, so-called photons. With a single photon it is possible to transfer quantum information. The information can be encoded in the polarization or in the phase of the photons' wave packets and can be used in quantum communication and computation. In such applications, a single-photon source, a device that emits photons one by one, is a prerequisite. One of the most promising platforms for single-photon sources is based on semiconductor quantum dots. One major unsolved problem is, however, that the "color" (or wavelength) of the photons emitted by a quantum dot is not locked to a precise value; rather, it wanders around randomly.

The fluctuations in the wavelength of the photons originate from imperfections in the vicinity of the quantum dot. These imperfections can trap electric charge in the semiconductor resulting in noise. To remove this «charge noise», Prof. Warburton of the Department of Physics at the University of Basel and his team have developed a quantum-classical hybrid system that connects a single quantum dot to a constant-wavelength laser. This stabilizing mechanism monitors continuously the fluctuations via the highly sensitive optical absorption of the quantum dot. By applying the exact opposite effect, the electrical field experienced by the quantum dot can be actively regulated.

Stream of single-color photons With this system, the scientists succeeded in generating a nearly perfect stream of single-color photons. A notable point is that a quantum system could be made technically useful by using a classical feedback scheme, a general feature which has not been demonstrated up until now.

This new scheme - through its highly effective removal of the charge noise - potentially enables a stable single-photon source and may lead, for example, to improvement in semiconductor-based spin quibts. The study was supported by the National Center of Competence in Research «QSIT – Quantum Science and Technology», for which the University of Basel acts as Co-Leading-House.

### Original Citation Jonathan H. Prechtel, Andreas V. Kuhlmann, Julien Houel, Lukas Greuter, Arne Ludwig, Dirk Reuter, Andreas D. Wieck, and Richard J. Warburton Frequency-Stabilized Source of Single Photons from a Solid-State Qubit Phys. Rev. X 3, 041006 (2013) | DOI: 10.1103/PhysRevX.3.041006


ELSE PRESS RELEASES FROM THIS DATE:

Riboswitches in action

2013-11-04
Riboswitches in action Scientists at SISSA investigate a mechanism that switches genes on and off A cell is a complex environment in which substances (metabolites) must maintain a correct state of equilibrium, which may vary depending ...

As world sets new development goals, Malaysia calls for poverty relief within green agenda

2013-11-04
PUBLIC RELEASE DATE: 4-Nov-2013 [ | E-mail ] var addthis_pub="eurekalert"; var addthis_options = "favorites, delicious, digg, facebook, twitter, google, newsvine, reddit, slashdot, stumbleupon, buzz, more" Share Contact: Terry Collins tc@tca.tc 416-878-8712 Mastura Ishak mastura@might.org.my 60-14-665-1303 Intergovernmental Platform on Biodiversity and Ecosystem Services As world sets new development goals, Malaysia calls for poverty relief within green agenda Prime Minister Najib addresses new UN biodiversity organization KUALA LUMPUR - The ...

Is clinicians' decision making affected by 'precious baby' phenomenon?

2013-11-04
Is clinicians' decision making affected by 'precious baby' phenomenon? Study suggests clinicians' decision making could be affected by method of conception Parents who conceive through assisted reproductive technologies (ART) are likely to receive different ...

Quantum 'sealed envelope' system enables 'perfectly secure' information storage

2013-11-04
Quantum 'sealed envelope' system enables 'perfectly secure' information storage A breakthrough in quantum cryptography demonstrates that information can be encrypted and then decrypted with complete security using the combined power of quantum theory and relativity ...

Why tumor cells go on dangerous tours

2013-11-04
Why tumor cells go on dangerous tours Tumors become highly malignant when they acquire the ability to colonize other tissues and form metastases. Researchers at Ludwig-Maximilians-Universitaet (LMU) in Munich have identified a factor that promotes ...

Gravity and the robot satellite attitude problem

2013-11-04
Gravity and the robot satellite attitude problem Using an in-orbit robot to capturing a malfunctioning satellite that is tumbling out of control is currently just a theoretical idea. However, research inspired by nature to be published in the forthcoming issue of International ...

Leicester scientists map structure of key complex in the immune system

2013-11-04
Leicester scientists map structure of key complex in the immune system New study reveals the structure of complement component C1 &#8211 a target for complement-mediated diseases including strokes and heart attacks Leicester scientists have mapped the "bouquet-like" ...

Transmitting stress response patterns across generations

2013-11-04
Transmitting stress response patterns across generations From a new study in Biological Psychiatry Philadelphia, PA, November 4, 2013 – Children of survivors of extremely stressful life events face adjustment challenges of their own, as has been most carefully studied ...

Researchers warn of the 'myths' of global medical tourism

2013-11-04
Researchers warn of the 'myths' of global medical tourism A team of British researchers, led by the University of York, is warning governments and healthcare decision makers across the globe to be wary of the myths and hype surrounding medical tourism. In an article, ...

New chemistry: Drawing and writing in liquid with light

2013-11-04
New chemistry: Drawing and writing in liquid with light University of Helsinki researchers have manufactured photochemically active polymers which can be dissolved in water or certain alcohols. The new soluble, photosensitive polymer was created by doctoral ...

LAST 30 PRESS RELEASES:

Signs identified that precede sudden arrhythmic death syndrome in young people

Discovery of bacteria's defence against viruses becomes a piece of the puzzle against resistance

Pre-eclampsia is associated with earlier onset and higher incidence of cardiovascular risk factors

Warwick astronomers discover doomed pair of spiralling stars on our cosmic doorstep

Soil conditions significantly increase rainfall in world’s megastorm hotspots

NK cells complexed with bispecific antibody yield high response rates in patients with lymphoma

Planetary health diet and mediterranean diet associated with similar survival and sustainability benefits

Singapore launches national standard to validate antimicrobial disinfectant products

Molecular stool test could improve detection of tuberculosis in adults with HIV

Suspected fibrocartilaginous embolus in Asian small-clawed otter (Aonyx cinereus)

Enhancing heat transfer using the turbulent flow of viscoelastic fluids

Exercise as an anti-ageing intervention to avoid detrimental impact of mental fatigue

UMass Amherst Nursing Professor Emerita honored as ‘Living Legend’

New guidelines aim to improve cystic fibrosis screening

Picky eaters by day, buffet by night: Butterfly, moth diets sync to plant aromas

Pennington Biomedical’s Dr. Leanne Redman honored with the E. V. McCollum Award from the American Society for Nutrition

CCNY physicists uncover electronic interactions mediated via spin waves

Researchers’ 3D-printing formula may transform future of foam

Nurture more important than nature for robotic hand

Drug-delivering aptamers target leukemia stem cells for one-two knockout punch

New study finds that over 95% of sponsored influencer posts on Twitter were not disclosed

New sea grant report helps great lakes fish farmers navigate aquaculture regulations

Strain “trick” improves perovskite solar cells’ efficiency

How GPS helps older drivers stay on the roads

Estrogen and progesterone stimulate the body to make opioids

Dancing with the cells – how acoustically levitating a diamond led to a breakthrough in biotech automation

Machine learning helps construct an evolutionary timeline of bacteria

Cellular regulator of mRNA vaccine revealed... offering new therapeutic options

Animal behavioral diversity at risk in the face of declining biodiversity

Finding their way: GPS ignites independence in older adult drivers

[Press-News.org] Highly stable quantum light source for applications in quantum information developped