Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Tunable diamond string may hold key to quantum memory: A process similar to guitar tuning improves storage time of quantum memory

Electrodes stretch diamond strings to increase the frequency of atomic vibrations to which an electron is sensitive, just like tightening a guitar string increases the frequency or pitch of the string. The tension quiets a qubit's environment and improves memory from tens to several hundred nanoseconds, enough time to do many operations on a quantum chip.
CREDIT
Second Bay Studios/Harvard SEAS
Electrodes stretch diamond strings to increase the frequency of atomic vibrations to which an electron is sensitive, just like tightening a guitar string increases the frequency or pitch of the string. The tension quiets a qubit's environment and improves memory from tens to several hundred nanoseconds, enough time to do many operations on a quantum chip. CREDIT Second Bay Studios/Harvard SEAS

Abstract:
A quantum internet promises completely secure communication. But using quantum bits or qubits to carry information requires a radically new piece of hardware - a quantum memory. This atomic-scale device needs to store quantum information and convert it into light to transmit across the network.

Tunable diamond string may hold key to quantum memory: A process similar to guitar tuning improves storage time of quantum memory

Cambridge, MA | Posted on May 24th, 2018

A major challenge to this vision is that qubits are extremely sensitive to their environment, even the vibrations of nearby atoms can disrupt their ability to remember information. So far, researchers have relied on extremely low temperatures to quiet vibrations but, achieving those temperatures for large-scale quantum networks is prohibitively expensive.

Now, researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) and the University of Cambridge have developed a quantum memory solution that is as simple as tuning a guitar.

The researchers engineered diamond strings that can be tuned to quiet a qubit's environment and improve memory from tens to several hundred nanoseconds, enough time to do many operations on a quantum chip.

"Impurities in diamond have emerged as promising nodes for quantum networks," said Marko Loncar, the Tiantsai Lin Professor of Electrical Engineering at SEAS and senior author of the research. "However, they are not perfect. Some kinds of impurities are really good at retaining information but have a hard time communicating, while others are really good communicators but suffer from memory loss. In this work, we took the latter kind and improved the memory by ten times."

The research is published in Nature Communications.

Impurities in diamond, known as silicon-vacancy color centers, are powerful qubits. An electron trapped in the center acts as a memory bit and can emit single photons of red light, which would in turn act as long-distance information carriers of a quantum internet. But with the nearby atoms in the diamond crystal vibrating randomly, the electron in the center quickly forgets any quantum information it is asked to remember.

"Being an electron in a color center is like trying to study at a loud marketplace," said Srujan Meesala, a graduate student at SEAS and co-first author of the paper. "There is all this noise around you. If you want to remember anything, you need to either ask the crowds to stay quiet or find a way to focus over the noise. We did the latter."

To improve memory in a noisy environment, the researchers carved the diamond crystal housing the color center into a thin string, about one micron wide -- a hundred times thinner than a strand of hair -- and attached electrodes to either side. By applying a voltage, the diamond string stretches and increases the frequency of vibrations the electron is sensitive to, just like tightening a guitar string increases the frequency or pitch of the string.

"By creating tension in the string, we increase the energy scale of vibrations that the electron is sensitive to, meaning it can now only feel very high energy vibrations," said Meesala. "This process effectively turns the surrounding vibrations in the crystal to an irrelevant background hum, allowing the electron inside the vacancy to comfortably hold information for hundreds of nanoseconds, which can be a really long time on the quantum scale. A symphony of these tunable diamond strings could serve as the backbone of a future quantum internet."

Next, the researchers hope to extend the memory of the qubits to the millisecond, which would enable hundreds of thousands of operations and long-distance quantum communication.

The Harvard Office of Technology Development has protected the intellectual property relating to this project and is exploring commercialization opportunities.

###

The research was co-first authored by Young-Ik Sohn and Srujan Meesala from Marko Loncar's group at Harvard, and Benjamin Pingault from Mete Atature's group at the University of Cambridge. Researchers from Harvard SEAS, Harvard Physics, Sandia National Laboratories also contributed to the manuscript.

The research was supported by the National Science Foundation-sponsored Center for Integrated Quantum Materials, Office of Naval Research Multidisciplinary University Research Initiative on Quantum Optomechanics, NSF Emerging Frontiers in Research and Innovation ACQUIRE, the University of Cambridge, the ERC Consolidator Grant PHOENICS, and the EPSRC Quantum Technology Hub NQIT.

####

For more information, please click here

Contacts:
Leah Burrows

617-496-1351

Copyright © Harvard John A. Paulson School of Engineering and Applied Sciences

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Shape-shifting sensors could catch early signs of cancer October 19th, 2018

Study provides insight into how nanoparticles interact with biological systems: Findings can help scientists engineer nanoparticles that are ‘benign by design’ October 18th, 2018

Iran Produces Cooling Fabrics Using Nanotechnology October 17th, 2018

Iran World’s Second Largest Producer of Nano-Catalysts October 17th, 2018

Quantum communication

Tiny camera lens may help link quantum computers to network September 14th, 2018

'Spooky action at a distance': Researchers develop module for quantum repeater May 23rd, 2018

Error-free into the quantum computer age December 15th, 2017

Quantum communications bend to our needs: By changing the wavelengths of entangled photons to those used in telecommunications, researchers see quantum technology take a major leap forward September 28th, 2017

Govt.-Legislation/Regulation/Funding/Policy

Shape-shifting sensors could catch early signs of cancer October 19th, 2018

Arrowhead Pharmaceuticals Files for Regulatory Clearance to Begin Phase 1 Study of ARO-ANG3 October 15th, 2018

Graphene shows unique potential to exceed bandwidth demands of future telecommunications October 12th, 2018

High-performance self-assembled catalyst for SOFC October 12th, 2018

Possible Futures

Shape-shifting sensors could catch early signs of cancer October 19th, 2018

Study provides insight into how nanoparticles interact with biological systems: Findings can help scientists engineer nanoparticles that are ‘benign by design’ October 18th, 2018

Iran Unveils Its First Homegrown 3D Nano Printer October 17th, 2018

Rice U. announces $82 million in strategic research initiatives: Faculty, programs will expand in neuroengineering, synthetic biology, physical biology October 16th, 2018

Memory Technology

Energy-efficient spin current can be controlled by magnetic field and temperature: SCMR effect simplifies the design of fundamental spintronic components August 20th, 2018

Leti & CMP Announce World’s First Multi-Project-Wafer Service with Integrated Silicon OxRAM: Oxide-Based Resistive Ram Memory Platform Development for Backend Memories To Offer Non-Volatility Associated with Embedded Designs August 2nd, 2018

A molecular switch at the edge of graphene July 27th, 2018

Magnetic skyrmions: Not the only ones of their class: Jülich researchers discover a new type of magnetic particle-like object for data storage devices of the future June 28th, 2018

Quantum Computing

Researchers managed to prevent the disappearing of quantum information September 14th, 2018

Tiny camera lens may help link quantum computers to network September 14th, 2018

New photonic chip promises more robust quantum computers September 14th, 2018

Could a demon help to create a quantum computer? Physicists implement a version of Maxwell's famous thought experiment for reducing entropy September 5th, 2018

Optical computing/Photonic computing

Graphene shows unique potential to exceed bandwidth demands of future telecommunications October 12th, 2018

Columbia Engineers Build Smallest Integrated Kerr Frequency Comb Generator October 9th, 2018

Machine learning helps improving photonic applications September 28th, 2018

Halas wins American Chemical Society Award in Colloid Chemistry: Rice University nanophotonics pioneer honored for colloid research September 18th, 2018

Discoveries

Shape-shifting sensors could catch early signs of cancer October 19th, 2018

Study provides insight into how nanoparticles interact with biological systems: Findings can help scientists engineer nanoparticles that are ‘benign by design’ October 18th, 2018

Researchers quickly harvest 2-D materials, bringing them closer to commercialization: Efficient method for making single-atom-thick, wafer-scale materials opens up opportunities in flexible electronics October 12th, 2018

Graphene shows unique potential to exceed bandwidth demands of future telecommunications October 12th, 2018

Announcements

Shape-shifting sensors could catch early signs of cancer October 19th, 2018

Study provides insight into how nanoparticles interact with biological systems: Findings can help scientists engineer nanoparticles that are ‘benign by design’ October 18th, 2018

Iran Unveils Its First Homegrown 3D Nano Printer October 17th, 2018

Fat-Repellent Nanolayers Can Make Oven Cleaning Easier October 17th, 2018

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Study provides insight into how nanoparticles interact with biological systems: Findings can help scientists engineer nanoparticles that are ‘benign by design’ October 18th, 2018

Big award enables study of small surfaces: Rice U.'s Matt Jones wins Packard Fellowship to view nanoscale chemical reactions October 15th, 2018

Graphene shows unique potential to exceed bandwidth demands of future telecommunications October 12th, 2018

High-performance self-assembled catalyst for SOFC October 12th, 2018

Patents/IP/Tech Transfer/Licensing

180 Degree Capital Corp. Announces New Portfolio Holdings – Airgain, Inc., EMCORE Corporation, Lantronix, Inc. and PDL BioPharma, Inc. October 12th, 2018

Arrowhead Enters $3.7 Billion License and Collaboration Agreements with Janssen October 4th, 2018

Silvaco, Purdue team up to bring scalable atomistic TCAD solutions for next generation semiconductor devices and materials August 24th, 2018

CTI Materials drives nano commercialization with it's patented surfactant free nanoparticle dispersions August 15th, 2018

Military

Columbia Engineers Build Smallest Integrated Kerr Frequency Comb Generator October 9th, 2018

Light makes Rice U. catalyst more effective: Halas lab details plasmonic effect that allows catalyst to work at lower energy October 5th, 2018

Unmasking corrosion to design better protective thin films for metals: Researchers from three universities team up to analyze oxide films at atomic level October 3rd, 2018

Ultracold atoms used to verify 1963 prediction about 1D electrons: Rice University, University of Geneva study focuses on theory that's increasingly relevant to chipmakers September 5th, 2018

Grants/Sponsored Research/Awards/Scholarships/Gifts/Contests/Honors/Records

Iran World’s Second Largest Producer of Nano-Catalysts October 17th, 2018

Big award enables study of small surfaces: Rice U.'s Matt Jones wins Packard Fellowship to view nanoscale chemical reactions October 15th, 2018

Tracking a Killer: UCSB, UCSD and SBP researchers trace the complex and variable pathways to the deadly condition known as sepsis October 12th, 2018

Columbia Engineers Build Smallest Integrated Kerr Frequency Comb Generator October 9th, 2018

Research partnerships

Tracking a Killer: UCSB, UCSD and SBP researchers trace the complex and variable pathways to the deadly condition known as sepsis October 12th, 2018

Columbia Engineers Build Smallest Integrated Kerr Frequency Comb Generator October 9th, 2018

Leti Announces EU Project to Develop Powerful, Inexpensive Sensors with Photonic Integrated Circuits: REDFINCH Members Initially Targeting Applications for Gas Detection and Analysis For Refineries & Petrochemical Industry and Protein Analysis for Dairy Industry September 19th, 2018

Researchers develop microbubble scrubber to destroy dangerous biofilms September 19th, 2018

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project