Navigation Links
Pitt discoveries in quantum physics could change face of technology

PITTSBURGHResearchers at the University of Pittsburgh have made advances in better understanding correlated quantum matter that could change technology as we know it, according to a study published in the Nov. 20 edition of Nature.

W. Vincent Liu, associate professor of physics in Pitt's Department of Physics and Astronomy, in collaboration with researchers from the University of Maryland and the University of Hamburg in England, has been studying topological states in order to advance quantum computing, a method that harnesses the power of atoms and molecules for computational tasks. Through his research, with more than $1 million in funding from two consecutive four-year grants from the U.S. Army Research Office and a five-year shared grant from the DARPA Optical Lattice Emulator Program, Liu and his team have been studying orbital degrees of freedom and nano-Kelvin cold atoms in optical lattices (a set of standing wave lasers) to better understand new quantum states of matter.

From that research, a surprising topological semimetal has emerged.

"We never expected a result like this based on previous studies," said Liu. "We were surprised to find that such a simple system could reveal itself as a new type of topological statean insulator that shares the same properties as a quantum Hall state in solid materials."

Since the discovery of the quantum Hall effect by Klaus Van Klitzing in 1985, researchers like Liu have been particularly interested in studying topological states of matter, that is, properties of space unchanged under continuous deformations or distortions such as bending and stretching. The quantum Hall effect proved that when a magnetic field is applied perpendicular to the direction a current is flowing through a metal, a voltage is developed in the third perpendicular direction. Liu's work has yielded similar yet remarkably different results.

"This new quantum state is very reminiscent of quantum Hall edge states," said Liu. "It shares the same surface appearance, but the mechanism is entirely different: This Hall-like state is driven by interaction, not by an applied magnetic field."

Liu and his collaborators have come up with a specific experimental design of optical lattices and tested the topological semimetal state by loading very cold atoms onto this "checkerboard" lattice. Generally, these tests result in two or more domains with opposite orbital currents; therefore the angular momentum remains at zero. However, in Liu's study, the atoms formed global rotations, which broke time-reversal symmetry: The momentum was higher, and the currents were not opposite.

"By studying these orbital degrees of freedom, we were able to discover liquid matter that had no origins within solid-state electronic materials," said Liu.

Liu says this liquid matter could potentially lead toward topological quantum computers and new quantum devices for topological quantum telecommunication. Next, he and his team plan to measure quantities for a cold-atom system to check these predicted quantum-like properties.


Contact: B. Rose Huber
University of Pittsburgh

Related biology technology :

1. SynapDx Corporation Licenses Autism Diagnostic Discoveries From Childrens Hospital Boston
2. Plant BioTech World Congress to Highlight Scientific Discoveries and Technologies Bringing New Hope to Feeding the World and Improving Lives
3. Stemedica Selected By World Stem Cell Summit To Present Scientific Discoveries
4. New Discoveries on a Fingertip Test for Screening Silent Heart Disease Promising Results of Recent Clinical Studies to be Presented during the 2009 American College of Cardiology Conference, March 29th - April 1st in Orlando
5. Bionovo Publishes Discoveries in Predictable Tissue Selectivity for Selective Estrogen Receptor Modulators Platform
6. In new quantum-dot LED design, researchers turn troublesome molecules to their advantage
7. UCSB physicists identify room temperature quantum bits in widely used semiconductor
8. New hybrid technology could bring quantum information systems
9. Three for the price of one - mobile electrons multiplied in quantum dot films
10. Progress in quantum computing, qubit by qubit
11. The quantum tunneling effect leads electron transport in porphyrins
Post Your Comments:
(Date:11/24/2015)... Inc., a worldwide provider of clinical research services headquartered in ... has set a new quarterly earnings record in Q3 of 2015.  ... Q3 of 2014 to Q3 of 2015.   ... the establishment of an Asia-Pacific office to ... and Mexico , with the establishment ...
(Date:11/24/2015)... Massachusetts , November 24, 2015 SHPG ... will participate in the Piper Jaffray 27 th Annual Healthcare ... Tuesday, December 1, 2015, at 8:30 a.m. EST (1:30 p.m. GMT). ... , Chief Financial Officer, will participate in the Piper Jaffray 27 ... , NY on Tuesday, December 1, 2015, at 8:30 a.m. ...
(Date:11/24/2015)... , Nov. 24, 2015  Twist Bioscience, ... that Emily Leproust, Ph.D., Twist Bioscience chief executive ... Healthcare Conference on December 1, 2015 at 3:10 ... in New York City. --> ... . Twist Bioscience is on Twitter. Sign ...
(Date:11/24/2015)... , Nov. 24, 2015 /CNW Telbec/ - ProMetic Life Sciences ... today that Mr. Pierre Laurin , President and Chief ... at the upcoming Piper Jaffray 27 th Annual Healthcare ... on December 1-2, 2015. st , at ... one-on-one meetings throughout the day. The presentation will be available ...
Breaking Biology Technology:
(Date:11/12/2015)... 11, 2015   Growing need for low-cost, ... has been paving the way for use of ... discrete analytes in clinical, agricultural, environmental, food and ... used in medical applications, however, their adoption is ... to continuous emphasis on improving product quality and ...
(Date:11/10/2015)... Nov. 10, 2015 About ... that helps to identify and verify the identity ... considered as the secure and accurate method of ... a particular individual because each individual,s signature is ... especially when dynamic signature of an individual is ...
(Date:11/4/2015)... --> --> ... Transparency Market Research "Home Security Solutions Market - Global Industry ... 2022", the global home security solutions market is expected to reach ... market is estimated to expand at a CAGR of ... Rising security needs among customers at homes, the emergence ...
Breaking Biology News(10 mins):