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Positioning Quantum Dots in Devices by Electroosmotic Feedback Control (ISR IP)

ISR intellectual property available to license

Inventors: Benjamin Shapiro, Edo Waks

Semiconductor quantum dots (QDs) are ideal candidates for storing and manipulating quantum information. To perform scalable quantum computation and long distance quantum networking requires the ability to deterministically position and fix many QDs into a single device, an ability that is currently not available. Such integration would enable one to engineer ultra compact computers that would fit on a small semiconductor chip. Quantum dot structures are usually formed by a bottom-up self assembly approach, which results in random spatial and spectral distribution. This randomness makes it extremely difficult to position a resonant QD inside an optical micro-cavity, a necessary step for implementing quantum devices.

Researchers at the University of Maryland, College Park have proposed a method for deterministically positioning single colloidal QDs with the desired spectral properties inside micro-cavity resonators using micro-fluidics coupled with a technique called electroosmotic flow control. This unique approach allows nanometer scale positioning accuracy, which cannot be achieved by any other known method.

Deterministically coupling quantum dots to photonic crystal cavity waveguide networks would enable a wide range of novel applications in quantum computing and quantum networking. In the area of quantum computing the methods that have been explored by the researchers could form the basis for implementing scalable universal quantum computation via two promising approaches, Linear optical Quantum Computation (LOQC) and quantum computation based on Dipole Induced Transparency (DIT).

For more information
If you would like to license this intellectual property, have questions, would like to contact the inventors, or need more information, contact ISR External Relations Director Jeff Coriale at or 301.405.6604.

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You can go to our main IP search page to search by research category or faculty name. Or view the entire list of available IP on our complete IP listing page.

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Feedback Control of Protein Crystal Growth (ISR IP)
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June 23, 2007

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For more information, contact ISR External Relations Director
Jeff Coriale at or 301.405.6604.

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