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Sujet de stage / Master 2 Internship

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Realization of quantum limited amplifiers

Contact: VION Denis, , denis.vion@cea.fr, +33 1 69 08 74 44/55 29
The goal of the internship is to design broadband quantum limited parametric amplifiers, to fabricate and measure existing designs, and if time allows to participate to a quantum information experiment using those parametric amplifiers.
Possibility of continuation in PhD: Oui
Deadline for application:09/04/2018

Full description:
The Quantronics group at CEA Saclay is performing research in fundamental solid state physics at very low temperature, and in particular in quantum electronics. Most of our experiments require advanced microwave instrumentation whose key component is a quantum limited amplifier.

A quantum limited amplifier is a device that adds a limited amount of noise to the measured signal, i.e. half a photon at the frequency of the signal, defined by the uncertainty principle. It is widely developed in many leading groups in the domain of quantum information processing, as it enables for instance quantum states squeezing, single-shot measurement of Qubit states or following quantum trajectories. It is also an essential tool in fundamental solid state physics at high frequency, and has a high potential for applications to astronomy experiments.

There exists nowadays various propositions to implement such device. In the group, we have developed a Josephson parametric amplifier [1] taking advantage of the Josephson inductance non-linearity. Our project now is to implement a larger bandwidth version of JoPA, and by turning to completely new working principles to improve both bandwidth and saturation power.

During the internship, the candidate will get familiar with quantum limited amplification by fabricating existing designs, and measuring them. He/she will also participate to the development of new types of designs to enhance their performances. Depending on the internship duration, the student could participate to experiments using his/her paramps. The student will be supervised by 2 permanent researchers and a post-doc working on the subject.

The candidate should have solid grounds in quantum and solid state physics and should be able from the start to lead the modelization of a quantum circuit, using softwares such as mathematica and spice. A certain degree of independence and of experimental skills are a plus.

[1] X. Zhou, V. Schmitt, P. Bertet, D. Vion, W. Wustmann, V. Shumeiko, and D. Esteve Phys. Rev. B 89, 214517 (2014).

contact: Helene le Sueur and Denis Vion
Technics/methods used during the internship:
Numerical simulation, nanofabrication, cryogenics, microwave measurements

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