laboratory for integrated nano-quantum systems

Stanford University, Department of Applied Physics, Ginzton Lab

Posted on October 17, 2017

Rishi’s paper gets published in Phys Rev Applied

Engineering Phonon Leakage in Nanomechanical Resonators Rishi N. Patel, Christopher J. Sarabalis, Wentao Jiang, Jeff T. Hill, and Amir H. Safavi-Naeini, Phys. Rev. Applied 8, 041001

Optomechanical crystals, which confine light and sound, have recently enabled the generation of quantum states of mechanical motion. To build a phonon network with these devices, one requires a means to transfer phonons from confined modes to an external channel. In this work, we solve the problem of “opening up” an optomechanical crystal to phonons, so that the acoustic waves can be made to leak out onto the surface of a chip. Crucially, our technique preserves the optical properties of the system.

Marek’s in PRA!

Millimeter-wave interconnects for microwave-frequency quantum machines Marek Pechal, Amir H. Safavi-Naeini, Phys. Rev. A 96, 042305

In this paper, we propose and study a method to realize quantum interconnects between microwave-frequency superconducting circuit by converting the transmitted signal from microwave to millimeter-wave frequencies (hundreds of gigahertz). A millimeter wave link can be operated at temperatures above 4 Kelvin which is a significant improvement over direct microwave connections using waveguides which need to be cooled to tens of millikelvin. Compared with optical interconnects which can work at room temperature, conversion between microwaves and millimeter waves requires about 9 orders of magnitude less energy per converted qubit than conversion to optical frequencies, which makes this scheme more suitable for operation inside a dilution cryostat. This leads us to believe that millimeter wave links may be a suitable compromise between optical and direct microwave connections.