Characterization of Tunnel Diode Oscillator for Qubit Readout Applications
Ivan Grytsenko (RIKEN Center for Quantum Computing)
Sander van Haagen (RIKEN Center for Quantum Computing, TU Delft - Electrical Engineering, Mathematics and Computer Science)
Oleksiy Rybalko (RIKEN Center for Quantum Computing, National Academy of Sciences of Ukraine )
Asher Jennings (RIKEN Center for Quantum Computing)
Rajesh Mohan (RIKEN Center for Quantum Computing)
Yiran Tian (Kazan Federal University, Kazan)
Erika Kawakami (RIKEN Center for Quantum Computing, RIKEN)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
We developed a tunnel diode oscillator and characterized its performance, demonstrating its potential applications in the quantum state readout of electrons in semiconductors and electrons on liquid helium. This cryogenic microwave source demonstrates significant scalability potential for large-scale qubit readout systems due to its compact design and low-power consumption of only 1 µW, making it suitable for integration on the 10 mK stage of a dilution refrigerator. The tunnel diode oscillator exhibits superior amplitude stability compared to commercial microwave sources. The output frequency is centered around 140 MHz, commonly used for qubit readout of electrons in semiconductors, with a frequency tunability of 10 MHz achieved using a varactor diode. Furthermore, the phase noise was significantly improved by replacing the commercially available voltage source with a lead-acid battery, achieving a measured phase noise of -115 dBc/Hz at a 1 MHz offset.