Navigation Links
Connecting the (quantum) dots
Date:2/26/2013

PITTSBURGHRecent research offers a new spin on using nanoscale semiconductor structures to build faster computers and electronics. Literally.

University of Pittsburgh and Delft University of Technology researchers reveal in the Feb. 17 online issue of Nature Nanotechnology a new method that better preserves the units necessary to power lightning-fast electronics, known as qubits (pronounced CUE-bits). Hole spins, rather than electron spins, can keep quantum bits in the same physical state up to 10 times longer than before, the report finds.

"Previously, our group and others have used electron spins, but the problem was that they interacted with spins of nuclei, and therefore it was difficult to preserve the alignment and control of electron spins," said Sergey Frolov, assistant professor in the Department of Physics and Astronomy within Pitt's Kenneth P. Dietrich School of Arts and Sciences, who did the work as a postdoctoral fellow at Delft University of Technology in the Netherlands.

Whereas normal computing bits hold mathematical values of zero or one, quantum bits live in a hazy superposition of both states. It is this quality, said Frolov, which allows them to perform multiple calculations at once, offering exponential speed over classical computers. However, maintaining the qubit's state long enough to perform computation remains a long-standing challenge for physicists.

"To create a viable quantum computer, the demonstration of long-lived quantum bits, or qubits, is necessary," said Frolov. "With our work, we have gotten one step closer."

The holes within hole spins, Frolov explained, are literally empty spaces left when electrons are taken out. Using extremely thin filaments called InSb (indium antimonide) nanowires, the researchers created a transistor-like device that could transform the electrons into holes. They then precisely placed one hole in a nanoscale box called "a quantum dot" and controlled the spin of that hole using electric fields. This approach featuring nanoscale size and a higher density of devices on an electronic chipis far more advantageous than magnetic control, which has been typically employed until now, said Frolov.

"Our research shows that holes, or empty spaces, can make better spin qubits than electrons for future quantum computers."

"Spins are the smallest magnets in our universe. Our vision for a quantum computer is to connect thousands of spins, and now we know how to control a single spin," said Frolov. "In the future, we'd like to scale up this concept to include multiple qubits."


'/>"/>

Contact: B. Rose Huber
rhuber@pitt.edu
412-624-4356
University of Pittsburgh
Source:Eurekalert

Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/29/2017)... , Mar. 29, 2017 Research ... Biotechnology: Emerging Technologies and Global Markets" report to their ... ... next generation DNA sequencing, biochips, RNA interference, synthetic biology tools ... seeds; and biologicals. These technologies and products are ...
(Date:3/28/2017)... ... March 28, 2017 , ... Mass spectrometry is becoming more widely for ... is driven by its potential to perform challenging analyses in complex matrices and sample ... must be addressed for it to be routinely used for medical testing. ...
(Date:3/28/2017)... ... March 28, 2017 , ... ... of the Modular Building Institute (MBI), an international modular trade organization, were awarded ... modular category for the Pagliuca Life Lab at Harvard University. The awards were ...
(Date:3/28/2017)... WASHINGTON , March 28, 2017  The National ... has joined the health policy research organization as its ... Medical and Regulatory Affairs ( North America ... Board of Directors. "We,re pleased to have ... NPC President Dan Leonard . "We welcome their ...
Breaking Biology Technology:
(Date:3/6/2017)... Calif. , March 6, 2017 ... and sales technology, today announced Predictive Sales Coach ... for infusing actionable sales intelligence into Salesforce. This ... automatically enable their sales organizations with deep knowledge ... that allow for intelligent engagement. Predictive Sales Coach ...
(Date:3/2/2017)... , March 2, 2017 Who risk to ... Download the full report: https://www.reportbuyer.com/product/4313699/ ... FINGERPRINT SENSOR FIELD? Fingerprint sensors using capacitive technology ... fingerprint sensor vendor Idex forecasts an increase of 360% ... devices and of the fingerprint sensor market between 2014 ...
(Date:2/28/2017)... --  Acuant , a leading provider of data capture ... new and core technologies building upon the acquisition of ... desktop Acuant FRM TM facial recognition and match ... manual review of identity documents by accredited professionals. ... most accurate capture software to streamline workflows by securely ...
Breaking Biology News(10 mins):