New discovery takes scientists a step closer to quantum computers

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London, July 3 (ANI): Taking a step nearer to quantum computers, University of Maryland researchers have used a unique hybrid nanostructure to show a new type of light-matter interaction.

They also demonstrated the first full quantum control of qubit spin within very tiny colloidal nanostructures (a few nanometers)- a feat that brings them closer in efforts to create a quantum computer.

According to the authors and outside experts, the new findings further advance the promise these new nanostructures hold for quantum computing and for new, more efficient, energy generation technologies (such as photovoltaic cells), as well as for other technologies that are based on light-matter interactions like biomarkers.

"The real breakthrough is that we use a new technology from materials science to 'shed light' on light-matter interactions and related quantum science in ways that we believe will have important applications in many areas, particularly energy conversion and storage and quantum computing," Nature quoted lead researcher Min Ouyang, an assistant professor in the department of physics and in the university's Maryland NanoCenter, as saying.

"In fact, our team already is applying our new understanding of nanoscale light-matter interactions and advancement of precise control of nanostructures to the development of a new type of photovoltaic cell that we expect to be significantly more efficient at converting light to electricity than are current cells," he added.

The researchers have created a patent-pending process that uses chemical thermodynamics to produce, in solution, a broad range of different combination materials, each with a shell of structurally perfect mono-crystal semiconductor around a metal core.

In the current study, the researchers used hybrid metal/semiconductor nanostructures developed through this process to experimentally demonstrate "tunable resonant coupling" between a plasmon (from metal core) and an exciton (from semiconductor shell), with a resulting enhancement of the Optical Stark Effect.

This effect was discovered some 60 years ago in studies of the interaction between light and atoms that showed light can be applied to modify atomic quantum states.

"Metal-semiconductor heteronanostructures have been investigated intensely in the last few years with the metallic components used as nanoscale antennas to couple light much more effectively into and out of semiconductor nanoscale, light-emitters," said Garnett W. Bryant, leader of the Quantum Processes and Metrology Group in the Atomic Physics Division of the National Institute of Standards and Technology (NIST).

"The research led Min Ouyang shows that a novel heteronanostructure with the semiconductor surrounding the metallic nanoantenna can achieve the same goals. Such structures are very simple and much easier to make than previously attempted, greatly opening up possibilities for application. Most importantly, they have demonstrated that the light/matter coupling can be manipulated to achieve coherent quantum control of the semiconductor nanoemitters, a key requirement for quantum information processing," he added.

The researchers agree that their new findings were made possible by their crystal-metal hybrid nanostructures, which offer a number of benefits over the epitaxial structures used for previous work.

Epitaxy has been the principle way to create single crystal semiconductors and related devices.

The new research highlights the new capabilities of these UM nanostructures, made with a process that avoids two key constraints of epitaxy-a limit on deposition semiconductor layer thickness and a rigid requirement for "lattice matching."

The study has been published in the latest issue of Nature. (ANI)

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