Cool Nano Loudspeakers Could Make for Better MRIs, Quantum Computers

Researchers from Joint Quantum Institute (National Institute of Standards and Technology (NIST) and the University of Maryland, College Park), the Neils Bohr Institute in Copenhagen, Denmark, and Harvard University have described a theoretical system that may allow the detection of very small electrical signals by utilizing laser light.nanoloudspeakers

The technology framework uses a nano scale mechanical membrane that vibrates in response to an electrical signal, with the frequency proportional to the signal strength. Shining a laser onto the membrane will let you measure the vibration frequency, identifying the nature of the original signal. Because these sensors can be very small and remain cool, it may be possible to reduce the size, energy requirements, and improve all sorts of characteristics of MRI machines when their superconducting magnets are no longer necessary.

From the study abstract:

We explore a method for laser cooling and optical detection of excitations in a room temperature LC electrical circuit. Our approach uses a nanomechanical oscillator as a transducer between optical and electronic excitations. An experimentally feasible system with the oscillator capacitively coupled to the LC and at the same time interacting with light via an optomechanical force is shown to provide strong electromechanical coupling. Conditions for improved sensitivity and quantum limited readout of electrical signals with such an “optical loud speaker” are outlined.

A team of physicists from the Joint Quantum Institute (JQI), the Neils Bohr Institute in Copenhagen, Denmark, and Harvard University has developed a theory describing how to both detect weak electrical signals and cool electrical circuits using light and something very like a nanosized loudspeaker.* If demonstrated through experiment, the work could have a tremendous impact on detection of low-power radio signals, magnetic resonance imaging (MRI), and the developing field of quantum information science.

The JQI is a collaborative venture of the National Institute of Standards and Technology (NIST) and the University of Maryland, College Park.

“We envision coupling a nanomechanical membrane to an electrical circuit so that an electrical signal, even if exceedingly faint, will cause the membrane to quiver slightly as a function of the strength of that signal,” says JQI physicist Jake Taylor. “We can then bounce photons from a laser off that membrane and read the signal by measuring the modulation of the reflected light as it is shifted by the motion of the membrane. This leads to a change in the wavelength of the light.”

Present technology for measuring the wavelength of light is highly sensitive, which makes it ideal for detecting the nanoscopic motions of the loudspeaker caused by extremely faint electrical signals.

And the ability to detect extremely faint electrical signals may someday make MRI medical procedures much easier.

“MRI machines are so big because they are stuffed with really powerful superconducting magnets, but if we can reduce the strength of the signals we need for a reading, we can reduce the strength, and the size, of the magnets,” Taylor says. “This may mean that one could get an MRI while sitting quietly in a room and forgo the tube.”

The same setup could be used to generate information-carrying photons from one qubit to another, according to Taylor.

One popular quantum information system design uses light to transfer information among qubits, entangled particles that will exploit the inherent weirdness of quantum phenomena to perform certain calculations impossible for current computers. The ‘nanospeaker’ could be used to translate low-energy signals from a quantum processor to optical photons, where they can be detected and transmitted from one qubit to another.


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