Graphene Drumheads Could Lead to New Sensors for Mobile Phones

Researchers envision technique could be used for quantum memory for quantum computing

2 min read
Graphene Drumheads Could Lead to New Sensors for Mobile Phones
Illustration: TU Delft

Just over two years ago, we reported on research out of the National Institute of Standards and Technology (NIST) and the University of Maryland that discovered graphene could be manipulated to act like a drumhead giving it electromechanical properties.

Following along this line of research, a team of scientists at the TU Delft’s Kavli Institute of Nanoscience in the Netherlands has demonstrated that using this drumhead principal for graphene could lead to new types of sensors for mobile phones, or even quantum memory used in quantum computing.

In research published in the journal Nature Nanotechnology, the Dutch research used the graphene as a mirror in optomechanical cavity and shot microwave-frequency light at it to essentially bang the graphene drumhead.

“In optomechanics you use the interference pattern of light to detect tiny changes in the position of an object, explains Dr. Vibhor Singh, one of the researchers, in a news release. “In this experiment, we shot microwave photons at a tiny graphene drum. The drum acts as a mirror: by looking at the interference of the microwave photons bouncing off the drum, we are able to sense minute changes in the position of the graphene sheet of only 17 femtometers, nearly 1/10000th of the diameter of an atom.”

The researchers used the radiation pressure from the photons on the graphene drumhead to create an amplifier in which microwave signals such as those used in mobile phones are amplified by the mechanical motion of the drum.

In the short video below, you can see how the mechanism works. The light comes in and moves the graphene drumhead creating a resonator that produces a signal.

The researchers also think that this technology could be used as memory for future quantum computers

“One of the long-term goals of the project is explore 2D crystal drums to study quantum motion,” said research group leader Dr. Gary Steele in the release. “If you hit a classical drum with a stick, the drumhead will start oscillating, shaking up and down. With a quantum drum, however, you cannot only make the drumhead move up and then down, but also make it into a ‘quantum superposition’, in which the drum head is both moving up and moving down at the same time.” Steele added: “This ‘strange’ quantum motion is not only of scientific relevance, but also could have very practical applications in a quantum computer as a quantum ‘memory chip’.”

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3 Ways 3D Chip Tech Is Upending Computing

AMD, Graphcore, and Intel show why the industry’s leading edge is going vertical

8 min read
Vertical
A stack of 3 images.  One of a chip, another is a group of chips and a single grey chip.
Intel; Graphcore; AMD
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A crop of high-performance processors is showing that the new direction for continuing Moore’s Law is all about up. Each generation of processor needs to perform better than the last, and, at its most basic, that means integrating more logic onto the silicon. But there are two problems: One is that our ability to shrink transistors and the logic and memory blocks they make up is slowing down. The other is that chips have reached their size limits. Photolithography tools can pattern only an area of about 850 square millimeters, which is about the size of a top-of-the-line Nvidia GPU.

For a few years now, developers of systems-on-chips have begun to break up their ever-larger designs into smaller chiplets and link them together inside the same package to effectively increase the silicon area, among other advantages. In CPUs, these links have mostly been so-called 2.5D, where the chiplets are set beside each other and connected using short, dense interconnects. Momentum for this type of integration will likely only grow now that most of the major manufacturers have agreed on a 2.5D chiplet-to-chiplet communications standard.

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