Back to Table of contents

Primeur weekly 2017-11-06

Quantum computing

Researchers develop data bus for quantum computer ...

Focus on Europe

Luxembourg 25th country to join PRACE ...

European Commission to invest 30 billion euro in new solutions for societal challenges and breakthrough innovation ...

Middleware

3i partners with DDN Storage to deliver demanding microscopy workflow solutions and unmatched performance ...

A third of the Internet is under attack ...

University of Nevada Las Vegas selects winning combination of Bright Cluster Manager and Advanced HPC ...

Hardware

Cray reports third quarter 2017 financial results ...

Asetek announces OEM partnership with E4 Computer Engineering and installation at CINECA in Italy ...

Asetek announces NEC Corporation as new data centre OEM partner ...

NVIDIA announces new AI partners, courses, initiatives to deliver deep learning training worldwide ...

Canadian Minister Qualtrough unveils new supercomputers to help forecast Canada's weather ...

KAUST IT receives iCMG Enterprise Architecture Award ...

Pawsey's Zeus expands to fulfil researchers' needs ...

NCI supercharges Raijin, Australia's fastest supercomputer ...

Supermicro showcases deep learning optimized systems ...

Applications

Sherlock deploys UC's first HIPAA-compliant Hadoop based data management system ...

Yu Liu appointed assistant professor of electrical & computer engineering at Clarkson University ...

Cutting datasets down to size ...

University of Delaware professor wins IEEE award ...

A bit of a 'quantum magic trick' ...

From quantum physicist to quantum CEO ...

High-performance computing methods focus of new text ...

Students explore immigration through a Big Data lens ...

Bright Computing announces reseller agreement with HPE for high performance computing and AI ...

The Cloud

IBM brings Cloud-native environment to private Clouds ...

IBM expands Watson Data Platform to help unleash AI for professionals ...

UberCloud brings parallel MPI to Univa Grid Engine's Docker support ...

Huawei acquires a seat in the Kubernetes Steering Committee ...

Red Hat improves IT flexibility and reduces complexity with Linux containers in latest version of production-ready OpenStack platform ...

A bit of a 'quantum magic trick'

2 Nov 2017 St, Louis - An accurate analog clock tick-tick-ticks with a constant precision and well known frequency: one tick per second. The longer you let it tick, the better to test its accuracy -10 times as long corresponds to a ten-fold improvement in any frequency uncertainty. But is there a faster way to determine a frequency?

It turns out there is, in a new discovery published in Physical Review Letters by a collaboration between a Washington University in St. Louis professor and graduate student along with a University of Rochester researcher.

The speed-up in frequency measurement comes from quantum mechanics. When a quantum bit is used to measure the frequency of a signal, the strange rules of quantum mechanics allow the frequency measurement to be much more accurate. The technique hinges on the ability to put the quantum bit in a superposition of its two quantum states, and then shift these states around in time with the signal.

Kater Murch, assistant professor of physics in Arts & Sciences, along with graduate student Mahdi Naghiloo and theory collaborator Andrew Jordan of Rochester described the technique as a "quantum magic trick".

"It's reminiscent of the magic tricks that involve a ball placed under one of two cups and the cups are shuffled around - except this time, the ball can be under both cups at the same time", Kater Murch stated. "The resulting speedup in frequency measurement is astonishing. Now, by measuring for 10 times as long, the frequency uncertainty can be reduced by a factor of 100 - enabling enhanced resolution of the frequency beyond any other technique of its kind. Earlier theory work published by the Jordan group this year has proven in two separate papers that the technique applied in this paper is the theoretical optimum that quantum mechanics allows."

The experiment was completed by using a superconducting quantum system where an external oscillating signal with unknown frequency caused the quantum system to undergo periodic changes. By applying quantum pulses on top of the oscillating signal, the state of the system could be controlled so that the final readout of the quantum system became highly sensitive to the precise value of the oscillation frequency. The underlying physical source of the advantage is related to the fact that the energy of the quantum system is time-dependent, which causes the quantum states corresponding to different frequencies to accelerate away from each other, giving enhanced distinguishability in a given time.

This method permitted enhanced resolution of the frequency beyond any other technique of its kind, Andrew Jordan said.

This work is just one example of how the new field of quantum technologies uses the laws of quantum physics for technological advantage over classical physics, Andrew Jordan said. Other examples include quantum computing, quantum sensing and quantum simulation. For those fields, the exploitation of quantum physics provides benefits such as a speed up of database search, the factoring of large numbers or the rapid simulation of complex molecules.

Such fine-scale measurement of the frequency of a periodic signal is the fundamental ingredient in diverse applications including MRI medical imaging devices, the analysis of light emitted from stars and, of course, clock precision. Accelerating these measurements in a way that Kater Murch and Andrew Jordan have demonstrated could have profound impacts in many areas.

Kater Murch and Mahdi Naghiloo used timekeeping and GPS, and such constantly advancing technologies, as examples of the importance of their findings.

"Nowadays, most of us carry a phone in our pocket that is capable of telling us almost exactly where we are on Earth using the Global Positioning System", Kater Murch stated. "The way this works is that your phone receives signals from several different satellites, and by timing the relative arrival of these signals it infers your position. The accuracy of the timing directly relates to the accuracy of your position - a relationship between timekeeping and navigation that has persisted for hundreds of years."

"Well before GPS, a sailor who wanted to know his location would navigate by the stars. In the Northern Hemisphere, the height of the north star will tell you your latitude, but to know your longitude, you need to keep track of the time. As the night goes on, the stars circle around the north star - the height of any star above the horizon is related to the local time, and by comparing this time to a clock set to Greenwich Mean Time, the time difference gives your longitude."

Nautical timekeeping underscores the vitality of frequency advances.

"In the 1700s, accurate clocks were the main limitation to ocean navigation", Kater Murch stated. "The Scilly naval disaster of 1707 - one of the worst disasters in British naval history - was widely blamed on poor navigation, prompting the British government to invest heavily in precise clocks. The resulting chronometers transformed marine navigation and greatly accelerated the age of discovery."

"Advances in timekeeping continue to have profound impact on technology and fundamental science. Quantum tools, such as the quantum speedup in frequency measurement that we discovered, are necessary to push these technologies forward. This is an exciting time for quantum physics because these quantum resources are increasingly leading to practical advantages over traditional measurement approaches."

The study was funded by National Science Foundation grants DMR-1506081 and PHY-1607156; Office of Naval Research No. 12114811; and Army Research Office No. W911NF-15-1-0496. This research used facilities at the Institute of Materials Science and Engineering at Washington University. Kater Murch also acknowledged support from the Sloan Foundation.
Source: Washington University in St. Louis

Back to Table of contents

Primeur weekly 2017-11-06

Quantum computing

Researchers develop data bus for quantum computer ...

Focus on Europe

Luxembourg 25th country to join PRACE ...

European Commission to invest 30 billion euro in new solutions for societal challenges and breakthrough innovation ...

Middleware

3i partners with DDN Storage to deliver demanding microscopy workflow solutions and unmatched performance ...

A third of the Internet is under attack ...

University of Nevada Las Vegas selects winning combination of Bright Cluster Manager and Advanced HPC ...

Hardware

Cray reports third quarter 2017 financial results ...

Asetek announces OEM partnership with E4 Computer Engineering and installation at CINECA in Italy ...

Asetek announces NEC Corporation as new data centre OEM partner ...

NVIDIA announces new AI partners, courses, initiatives to deliver deep learning training worldwide ...

Canadian Minister Qualtrough unveils new supercomputers to help forecast Canada's weather ...

KAUST IT receives iCMG Enterprise Architecture Award ...

Pawsey's Zeus expands to fulfil researchers' needs ...

NCI supercharges Raijin, Australia's fastest supercomputer ...

Supermicro showcases deep learning optimized systems ...

Applications

Sherlock deploys UC's first HIPAA-compliant Hadoop based data management system ...

Yu Liu appointed assistant professor of electrical & computer engineering at Clarkson University ...

Cutting datasets down to size ...

University of Delaware professor wins IEEE award ...

A bit of a 'quantum magic trick' ...

From quantum physicist to quantum CEO ...

High-performance computing methods focus of new text ...

Students explore immigration through a Big Data lens ...

Bright Computing announces reseller agreement with HPE for high performance computing and AI ...

The Cloud

IBM brings Cloud-native environment to private Clouds ...

IBM expands Watson Data Platform to help unleash AI for professionals ...

UberCloud brings parallel MPI to Univa Grid Engine's Docker support ...

Huawei acquires a seat in the Kubernetes Steering Committee ...

Red Hat improves IT flexibility and reduces complexity with Linux containers in latest version of production-ready OpenStack platform ...