Quantum Optics with Propagating Microwaves in Superconducting Circuits
Doktorsavhandling, 2013

We address recent advances in quantum optics with propagating microwaves in superconducting circuits. This research field exploits on the fact that the coupling between a superconducting artificial atom and propagating microwave photons in a one-dimensional (1D) open transmission line can be made strong enough to observe quantum effects, without using any cavity to confine the microwave photons. We embed an artificial atom, a superconducting transmon qubit, in a 1D open transmission line and investigate the scattering properties of coherent microwaves. When an input coherent state, with an average photon number much less than 1, is on resonance with the artificial atom, we observe extinction of up to 99% in the forward propagating field. We observe the strong nonlinearity of the artificial atom and under strong driving we observe the Mollow triplet. We also study the statistics of the reflected and transmitted beams, which are predicted to be nonclassical states. In particular, we demonstrate photon antibunching in the reflected beam by measuring the second-order correlation function. By applying a second control tone, we observe the Autler-Townes splitting and a giant cross-Kerr effect. Furthermore, we demonstrate fast operation of a single-photon router using the Autler-Townes splitting. This device provides important steps towards the realization of a quantum network. This thesis describes the motivation, theoretical background, design, implementation and measurement results.


second-order correlation function


microwave photons

photon router

superconducting artificial atom

Autler-Townes splitting

quantum network


superconducting circuits

cross-Kerr effect


Mollow triplet

Josephson junction

quantum optics

Kollektorn, MC2
Opponent: Professor Andreas Wallraff, ETH Zurich


Io Chun Hoi

Chalmers, Mikroteknologi och nanovetenskap (MC2)


Nanovetenskap och nanoteknik


Atom- och molekylfysik och optik

Den kondenserade materiens fysik





Kollektorn, MC2

Opponent: Professor Andreas Wallraff, ETH Zurich