Quantum Dots Suited for Computing?
Quantum dots are promising candidates to replace the trapped atoms originally posited as the backbone of quantum computing, but it must be possible to manipulate and measure their quantum states. Now researchers at
Technische Universität München in Garching, Germany, have found a method to do so with an InGaAs dot in the active region of a GaAs photodiode.
They grew the structure by molecular beam epitaxy, using aluminum shadow masks with apertures of 100 to 500 nm to isolate a single dot. A mode-locked Ti:sapphire laser excited the dot through the apertures with 1-ps pulses, inducing Rabi oscillations between two exitonic energy levels that the researchers detected as deterministic photocurrent. For optical excitation with π pulses, each laser pulse triggers the flow of a single electron through the circuit, which is the key to single-electron optoelectronics and quantum gate readout. The work was reported in the Aug. 8 issue of
Nature.
LATEST NEWS
- Exail Signs LLNL Contract, Partners with Eelume
Apr 26, 2024
- Menlo Moves U.S. HQ: Week in Brief: 4/26/2024
Apr 26, 2024
- Optofluidics Platform Keys Label-, Amplification-Free Rapid Diagnostic Tool
Apr 25, 2024
- DUV Lasers Made with Nonlinear Crystals Enhance Lithography Performance
Apr 25, 2024
- Teledyne e2v, Airy3D Collaborate on 3D Vision Solutions
Apr 24, 2024
- One-Step Hologram Generation Speeds 3D Display Creation
Apr 24, 2024
- Innovation Award Winners for Laser Technology Honored in Aachen
Apr 23, 2024
- Intech 2024: AI Arrives on the Shop Floor
Apr 22, 2024