Back to Table of contents

Primeur weekly 2017-01-30

Exascale supercomputing

Co-design centres to help make next-generation exascale computing a reality ...

Quantum computing

Supercool electrons ...

D-Wave announces D-Wave 2000Q quantum computer and first system order ...

Temporal Defense Systems purchases the first D-Wave 2000Q quantum computer ...

Fast track control accelerates switching of quantum bits ...

Focus on Europe

Bright Computing teams up with SGI to co-sponsor UK HPC & Big Data event ...

When life sciences become data sciences ...

PRACE Spring School 2017 - HPC for Life Sciences, registration is open ...

ITER and BSC tighten their collaboration to simulate the process of fusion power generation ...

Netherlands eScience Center to issue annual report ...

Middleware

BSC releases PyCOMPSs version 2.0 as a PIP installable package ...

Hardware

RSC gets the highest Elite status in the Intel Solutions for Lustre Reseller Programme ...

Finding a needle in the ocean ...

GIGABYTE selects Cavium QLogic 10/25GbE FastLinQ technology to power its next generation servers ...

Setting up light paths using the SURFnet Network Dashboard ...

Minerva will calculate gravitational waves faster than the Albert Einstein Institute's previous supercomputer ...

Applications

Big Brother will have some difficulty 'watching you' in future ...

Engineers eat away at Ms. Pac-Man score with artificial player ...

Mummy visualization impresses in computer journal ...

Berkeley launches RISELab, enabling computers to make intelligent real-time decisions ...

Model sheds light on inhibitory neurons' computational role ...

Using Big Data to understand immune system responses ...

Artificial intelligence uncovers new insight into biophysics of cancer ...

PPPL scientist uncovers physics behind plasma-etching process ...

Computer-aided drug design ...

IBM expands choices for PowerAI developers with TensorFlow ...

Hussein Aluie awarded hours on supercomputer at Argonne ...

CWI develops algorithms that shorten response time of ambulance ...

A rising peptide: Supercomputing helps scientists come closer to tailoring drug molecules ...

The Cloud

Oracle expands Startup Accelerator Programme to further promote global Cloud innovation ...

Technical computing hub UberCloud receives funding from Earlybird ...

Fast track control accelerates switching of quantum bits


Intricately shaped pulses of light pave a speedway for the accelerated dynamics of quantum particles, enabling faster switching of a quantum bit. Image by Peter Allen.
12 Jan 2017 Argonne - From laptops to cellphones, today's technology advances through the ever-increasing speed at which electric charges are directed through circuits. Similar advances can happen in the emerging field of quantum technology by speeding up control over quantum states in atomic and nanoscale systems.

An international collaboration among physicists at the University of Chicago, the U.S. Department of Energy's (DOE) Argonne National Laboratory, McGill University and the University of Konstanz recently demonstrated a new framework for faster control of a quantum bit - the basic unit of information in yet-to-be created quantum computers - in findings published online November 28 inNature Physics. Their experiments on a single electron in a diamond chip could create quantum devices less prone to errors when operated at high speeds.

To understand the experiment, one can look to the ultimate setting for speed in classical dynamics: the oval racetracks at the Indianapolis 500 or Daytona 500. To enable the racecars to navigate the turns at awesome speeds, the racetrack's pavement is "banked" by up to 30 degrees. That inward slope of the pavement allows the normal force provided by the road to help cancel the car's centrifugal acceleration, or tendency to slide outward from the turn. The greater the speed of the racecar, the greater the bank angle required.

"The dynamics of quantum particles behave analogously", stated Aashish Clerk, professor of theoretical physics at McGill University. "Although the equations of motion are different, to accurately change the state of a quantum particle at high speeds, you need to design the right track to impart the right forces."

Aashish Clerk, together with McGill postdoctoral fellows Alexandre Baksic and Hugo Ribeiro, formulated a new technique to enable faster quantum dynamics by deftly absorbing detrimental accelerations felt by the quantum particle. These accelerations, unless compensated, would divert the particle from its intended trajectory in the space of quantum states, similar to how the centrifugal acceleration deflects the racecar from its intended racing line on the track.

David Awschalom, professor in spintronics and quantum information at University of Chicago's Institute for Molecular Engineering, realized the new theory could be used to speed up the diamond-based quantum devices in his labs, following discussions with members of his own group and Aashish Clerk's group. However, just as constructing the banked speedways presented challenges in civil engineering, executing the control sequences envisioned by Clerk and co-workers presented experimental challenges in quantum engineering.

Building the quantum fast track required shining intricately-shaped, synchronized laser pulses on single electrons trapped at defects inside their diamond chips. This experimental feat was achieved by lead author Brian Zhou, a member of David Awschalom's group, along with group members Christopher Yale, F. Joseph Heremans and Paul Jerger.

"We demonstrated that these new protocols could flip the state of a quantum bit, from 'off' to 'on', 300 percent faster than conventional methods", stated David Awschalom, also a senior scientist at Argonne. "Shaving every nanosecond from the operation time is essential to reduce the impact of quantum decoherence", he explained, referring to the process by which quantum information is lost to the environment.

University of Konstanz Prof. Guido Burkard and postdoc Adrian Auer joined members from the David Awschalom and Aashish Clerk groups to examine the data from the experiments. "What is promising for translating these techniques beyond the laboratory is that they are effective even when the system is not perfectly isolated", stated Guido Burkard, a leading expert in diamond-based quantum systems.

The researchers anticipate their methods can be further applied for fast and accurate control over the physical motion of atoms or the transfer of quantum states between different systems, and convey benefits to quantum applications, such as secure communications and simulation of complex systems.

The research was funded by DOE's Office of Science, the Air Force Office of Scientific Research, and the National Science Foundation.

An article based on the research, "Accelerated quantum control using superadiabatic dynamics in a solid-state lambda system", appeared in the November 28 edition ofNature Physics.
Source: Argonne National Laboratory

Back to Table of contents

Primeur weekly 2017-01-30

Exascale supercomputing

Co-design centres to help make next-generation exascale computing a reality ...

Quantum computing

Supercool electrons ...

D-Wave announces D-Wave 2000Q quantum computer and first system order ...

Temporal Defense Systems purchases the first D-Wave 2000Q quantum computer ...

Fast track control accelerates switching of quantum bits ...

Focus on Europe

Bright Computing teams up with SGI to co-sponsor UK HPC & Big Data event ...

When life sciences become data sciences ...

PRACE Spring School 2017 - HPC for Life Sciences, registration is open ...

ITER and BSC tighten their collaboration to simulate the process of fusion power generation ...

Netherlands eScience Center to issue annual report ...

Middleware

BSC releases PyCOMPSs version 2.0 as a PIP installable package ...

Hardware

RSC gets the highest Elite status in the Intel Solutions for Lustre Reseller Programme ...

Finding a needle in the ocean ...

GIGABYTE selects Cavium QLogic 10/25GbE FastLinQ technology to power its next generation servers ...

Setting up light paths using the SURFnet Network Dashboard ...

Minerva will calculate gravitational waves faster than the Albert Einstein Institute's previous supercomputer ...

Applications

Big Brother will have some difficulty 'watching you' in future ...

Engineers eat away at Ms. Pac-Man score with artificial player ...

Mummy visualization impresses in computer journal ...

Berkeley launches RISELab, enabling computers to make intelligent real-time decisions ...

Model sheds light on inhibitory neurons' computational role ...

Using Big Data to understand immune system responses ...

Artificial intelligence uncovers new insight into biophysics of cancer ...

PPPL scientist uncovers physics behind plasma-etching process ...

Computer-aided drug design ...

IBM expands choices for PowerAI developers with TensorFlow ...

Hussein Aluie awarded hours on supercomputer at Argonne ...

CWI develops algorithms that shorten response time of ambulance ...

A rising peptide: Supercomputing helps scientists come closer to tailoring drug molecules ...

The Cloud

Oracle expands Startup Accelerator Programme to further promote global Cloud innovation ...

Technical computing hub UberCloud receives funding from Earlybird ...