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Measurement Back-Action and Photon Detection in Microwave Quantum Optics

Anton Frisk Kockum (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik)
Göteborg : Chalmers University of Technology, 2012. - 68 s.
[Licentiatavhandling]

In quantum optics, the interaction between atoms and photons is studied. In recent years, microwave quantum optics with superconducting circuits has emerged as an important tool for fundamental quantum optics experiments, and also as a promising way for implementing quantum computation. The main reason for this development is the ease with which strong coupling and other properties of artificial atoms and microwave photons can be engineered in such a setup. This thesis is comprised of two papers dealing with measurements in microwave quantum optics. In Paper I, we show how unwanted measurement back-action can be undone for certain measurements on one and two qubits dispersively coupled to a microwave resonator. An important application of this result is to improve parity measurements, which are integral to error-correction codes needed to implement large-scale quantum computing. In Paper II, we investigate the possibility of using a three-level artificial atom, a transmon, to mediate a cross-Kerr type interaction between photons. The idea is to use it as a single-photon detector in the microwave regime, a component currently missing in the experimentalist's toolbox. We show that there are fundamental limitations to this setup, resulting in an unsatisfactory signal-to-noise ratio.

Nyckelord: Quantum Optics, Quantum Stochastic Calculus, Quantum Measurement, Transmon, Circuit QED, Photodetection, Parity Measurement, Dephasing



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Denna post skapades 2012-11-23. Senast ändrad 2014-09-02.
CPL Pubid: 166561

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik

Ämnesområden

Nanovetenskap och nanoteknik
Atom- och molekylfysik och optik
Den kondenserade materiens fysik

Chalmers infrastruktur

Relaterade publikationer

Inkluderade delarbeten:


Undoing measurement-induced dephasing in circuit QED


Examination

Datum: 2012-12-14
Tid: 10:00
Lokal: Luftbryggan (A810), Kemivägen 9, MC2, Chalmers, Göteborg
Opponent: Doktor Robert Johansson, Advanced Science Institute, RIKEN, Japan

Ingår i serie

Technical report MC2 - Department of Microtechnology and Nanoscience, Chalmers University of Technology 240