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:

Sylvester Cancer Tip Sheet for October 2025

Three science and technology leaders elected to Hertz Foundation Board of Directors

Jump Trading CSO Kevin Bowers elected to Hertz Foundation Board of Directors

Former Inscripta CEO Sri Kosaraju elected to Hertz Foundation Board of Directors

Citadel’s Jordan Chetty elected to Hertz Foundation Board of Directors

McGill research flags Montreal snow dump, inactive landfills as major methane polluters

A lightweight and rapid bidirectional search algorithm

Eighty-five years of big tree history available in one place for the first time

MIT invents human brain model with six major cell types to enable personalized disease research, drug discovery

Health and economic air quality co-benefits of stringent climate policies

How immune cells deliver their deadly cargo

How the brain becomes a better listener: How focus enhances sound processing

Processed fats found in margarines unlikely to affect heart health

Scientists discover how leukemia cells evade treatment

Sandra Shi MD, MPH, named 2025 STAT Wunderkind

Treating liver disease with microscopic nanoparticles

Chemicals might be hitching a ride on nanoplastics to enter your skin

Pregnant patients with preexisting high cholesterol may have elevated CV risk

UC stroke experts discuss current and future use of AI tools in research and treatment

The Southern Ocean’s low-salinity water locked away CO2 for decades, but...

OHSU researchers develop functional eggs from human skin cells

Most users cannot identify AI bias, even in training data

Hurricane outages: Analysis details the where, and who, of increased future power cuts

Craters on surface of melanoma cells found to serve as sites for tumor killing

Research Spotlight: Mapping overlooked challenges in stroke recovery

Geographic and temporal patterns of screening for breast, cervical, and colorectal cancer in the US

Cannabis laws and opioid use among commercially insured patients with cancer diagnoses

Research Spotlight: Surprising gene mutation in brain’s immune cells linked to increased Alzheimer’s risk

Missing molecule may explain Down syndrome

Donor diabetes and 1-year Descemet membrane endothelial keratoplasty success rate

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