Lancaster University is offering a PhD project to study superconducting quantum devices, with a focus on Josephson parametric amplifiers operating at millikelvin temperatures. The start date is 1 October 2019.
Quantum technologies require the preparation, manipulation and readout of quantum states that are sensitive to noise and prone to decoherence. One of the most promising approaches is based on using superconducting circuits that benefit from extremely low dissipation and well established fabrication process. The challenge in the field is handling quantum states with utmost care and amplifying extremely weak signals using advanced instrumentation. Recent developments depend on the availability of cryogenic amplifiers with sufficient gain and bandwidth, and with an added noise level that is only limited by intrinsic quantum fluctuations. Existing semiconductor and superconducting amplifiers all suffer from compromises in one or more of these critical specifications.
The Josephson Travelling Wave Parametric Amplifier (JTWPA) (A.B. Zorin, Phys. Rev. Applied 6, 034006 (2016)) is predicted to outperform the existing versions of parametric amplifiers in gain, bandwidth and simplicity of construction. The JTWPA will be integrated with the single-Cooper-pair transistor to facilitate early uptake by the user community.
The project will be undertaken in the Lancaster Quantum Technology Centre. The work is experimental and an essential part of the project will be device fabrication using state-of-the-art nanofabrication facilities available in the LQTC cleanroom. The student will gain experience of working in a cleanroom environment and acquire practical skills in electron-beam and photolithography, thin-film deposition and plasma processing. They will be assisted by the experienced dedicated cleanroom technicians and academic staff who have expertise and hands-on experience in nanofabrication. Device characterisation will be performed in a cryogenfree dilution refrigerator equipped with microwave measurement lines and cold amplifiers.
The Physics Department is holder of Athena SWAN Silver award and JUNO Championship status and is strongly committed to fostering diversity within its community as a source of excellence, cultural enrichment, and social strength. We welcome those who would contribute to the further diversification of our department.
Closing Date Applications will be accepted until the post is filled
Funding for these projects is available to citizens of the European Union including the UK. Applications from non-EU citizens will be considered, provided the applicant has access to an alternative source of funding.