Physics Staff Awards

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Category: Department News

Published: Thursday, April 27 2017 12:54

The Lorraine DeSalvo Chair's Endowed Award for Outstanding Service recognizes employees who provide benefit beyond their regular duties, promote positive professional and personal exchanges among colleagues, and work effectively within the Department of Physics and/or with outside contacts. Nominees must have been employed within the Department of Physics for a minimum of one year.

The Sibylle Sampson Award was established by Sibylle Sampson, a long-time Physics employee and valued assistant to former Chair John S. Toll. It spotlights an employee whose one-time accomplishment otherwise might go unrecognized. The employee’s undertaking will have benefited the entire Department or a specific unit, and shown creativity, initiative or self-motivation.  Nominees must have been employed within the Department of Physics for a minimum of one year. Two nominators are needed for the Sibylle Sampson Award.

The Staff Excellence Award recognizes employees who excel in job performance, provide a friendly and supportive atmosphere, and display a personal commitment to the Department and to positive workplace morale. Up to three awards may be given.  Nominees must have been employed within the Department of Physics for a minimum of one year.

Christopher Monroe Enters National Academy of Sciences

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Category: Department News

Published: Thursday, April 20 2017 13:28

Christopher Monroe, Distinguished University Professor & Bice Seci-Zorn Professor was elected to the U.S. National Academy of Sciences 2016. See recorded video http://www.nasonline.org/NAS154presentation.

Membership of the National Academy of Sciences is one the greatest and highest honors that a scientist can receive.  "The NAS membership totals approximately 2,290 members and 490 foreign associates, of whom approximately 200 have received Nobel prizes."  - NAS

Read more about Monroe's accomplishments.

Trapped ions and superconductors face off in quantum benchmark

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Category: Research News

Published: Thursday, April 13 2017 10:34

An artist's rendering of many linked trapped-ion modules. Researchers at JQI put one of their modules to the test against an IBM superconducting device. (Credit: E. Edwards/JQI)

The race to build larger and larger quantum computers is heating up, with several technologies competing for a role in future devices. Each potential platform has strengths and weaknesses, but little has been done to directly compare the performance of early prototypes. Now, researchers at the JQI have performed a first-of-its-kind benchmark test of two small quantum computers built from different technologies.

The team, working with JQI Fellow Christopher Monroe and led by postdoctoral researcher Norbert Linke, sized up their own small-scale quantum computer against a device built by IBM. Both machines use five qubits—the fundamental units of information in a quantum computer—and both machines have similar error rates. But while the JQI device relies on chains of trapped atomic ions, IBM Q uses coupled regions of superconducting material.

To make their comparison, the JQI team ran several quantum programs on the devices, each of which solved a simple problem using a series of logic gates to manipulate one or two qubits at a time. Researchers accessed the IBM device using an online interface, which allows anyone to try their hand at programming IBM Q.

Both computers have strengths and weaknesses. For example, the superconducting platform has quicker gates and may be easier to mass produce, but its man-made qubits are all slightly different and have shorter lifetimes. Monroe says that the slower gates of ions might not be a major hurdle, though. "Because there is time," Monroe says. "Trapped ion qubit lifetimes are way longer than any other type of qubit. Moreover, the ion qubits are identical, and they can be better replicated without error."

When put to the test, researchers found that the trapped-ion module was more accurate for programs that involved many pairs of qubits. Linke and Monroe attribute this to the simple fact that every qubit in their device is connected to every other—meaning that a logic gate can connect any pair of qubits. IBM Q has fewer than half the connections of its JQI counterpart, and in order to run some programs it had to shuffle information between qubits—a step that introduced errors into the calculation. When this shuffling wasn't necessary, the two computers had similar performance. "As we build larger systems, connectivity between qubits will become even more important," Monroe says.

The new study, which was recently published in Proceedings of the National Academy of Sciences, provides an important benchmark for researchers studying quantum computing. And such head-to-head comparisons will become increasingly important in the future. "If you want to buy a quantum computer, you'll need to know which one is best for your application," Linke says. "You'll need to test them in some way, and this is the first of this kind of comparison."

By Erin Marshall

REFERENCE PUBLICATION
"Experimental comparison of two quantum computing architectures," N.M. Linke, D. Maslov, M. Roetteler, S. Debnath, C. Figgatt, K.A. Landsman, K. Wright, C. Monroe, Proceedings of the National Academy of Sciences, 114, 3305-3310 (2017)
RESEARCH CONTACT
Norbert Linke|linke@umd.edu

Christopher Monroe|monroe@umd.edu

RELATED JQI ARTICLES
Programmable ions set the stage for general-purpose quantum computers

Three UMD Students Named 2017 Goldwater Scholars

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Category: Department News

Published: Tuesday, April 11 2017 10:04

Three University of Maryland students have been awarded scholarships by the Barry M. Goldwater Scholarship and Excellence in Education Foundation, which encourages students to pursue advanced study and careers in the sciences, engineering and mathematics. The Goldwater Foundation also recognized a fourth UMD student with an Honorable Mention.

UMD juniors Christopher Bambic, Eliot Fenton and Prayaag Venkat were among the 240 Barry Goldwater Scholars selected from 1,286 students nominated nationally this year. UMD junior Natalie Livingston was recognized with an Honorable Mention. The four students all plan to pursue doctoral degrees in their areas of study and to become university professors or researchers at government laboratories.

Read more.