Quantum computing is seen as a disruptive technology that could pave the way to the design of new computers able to solve problems out of reach of classical architectures. One of the challenges of quantum computing is to provide solutions of electronics able to control and read the Qubits at cryogenic temperature.
Oscillators is a key function of cryogenic temperature that can be found in the readout electronics or in the various reference frequency generators needed for high data-rate transmissions for example.
The postdoc will consist in designing low phase, low power and low volume oscillator using an innovative optomechanical resonator under study in LETI and to study its performances at cryogenic temperature. The post doc will take advantage of already existing devices at LICA laboratory and on the experience of LGECA laboratory on the design of optomechanical conditioning circuits and on the characterization of cryogenic circuits.
1 year contract renewable 1 year.
The post doctoral position will take place in LGECA (Design of analog electronics) and LICA (design of innovative transducers) of CEA-Leti.
The main objective of the post-doc will be to provide a prototype of a cryogenic oscillator fully compliant with the requirements of quantum applications in terms of power consumption, phase noise and volume. The oscillator will bring into play an innovative optomechanical resonator, yet existing, that has been designed by LICA laboratory. The scientific path to this goal should be the same as used for the design of heterogeneous systems: architecture study, design of a discrete electronics, fabrication and finally testing of the circuit at cryogenic temperature.
The architecture study goal will be to identify the oscillator topologies from the classical ones (Colpitts, Hartley, negative resistance etc.) that will be the more adequate to optomechanical resonators. For this work, the post doc should acquire a good knowledge of optomechanical resonators in order to write an accurate electrical model that will be used in electrical simulators during oscillator optimization. For this task, the post doc will beneficiate from the experience of the LICA laboratory.
The oscillator design phase will consist in optimizing the chosen oscillator architecture in order to fulfil the targeted specifications of quantum applications. Components of the shelf (COTS) will be used to design the discrete component based oscillator. The PCB design will necessitate a particular care to ensure good signal integrity to optimize phase noise. The design will be optimized at room temperature for which component models are available. An extrapolation of the oscillator performances at cryogenic temperature should be proposed. For the oscillator design phase, the post-doc will beneficiate of the experience of LGECA in the conditioning of optomechanical transducers.
Last, test and validation should be performed in a two times process. First, the optomechanical oscillator will be fully tested at room temperature. This test should validate the resonator modelling, and should validate the electronics of the oscillator and its design methodology. This first test will permit to detect non-idealities that have not been taken into account during the design of this first prototype. This will permit to optimize a second version before its test at cryogenic temperature. The second phase will evaluate the oscillator performances at cryogenic temperature (77K and 4K) using the cryogenic facilities of CEA. The performances of the oscillator will be assessed respect to quantum application specifications and should provide insights of the solution adequateness.
At the end of the post doc, a demonstrator of a first cryogenic optomechanical oscillator is expected as well as a design methodology of such devices.
The post doc applicant should provide a particular attention to patenting and publishing of the main results of this research.
#Quantum
The applicant should have a PhD in electronics with a specialization in analog electronics. Ideally, the candidate should have good knowledge of transducer physics and good knowledge of the design of oscillators. Mastering modelling language as VerilogA or VerilogAMS as well as PCB design software will be appreciated. Curiosity, problem solving spirit, autonomy and good communication skills are required.
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