Joel Lindkvist

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We have embedded an artificial atom, a superconducting transmon qubit, in a 1D open space and investigated the scattering properties of an incident microwave coherent state. By studying the statistics of the reflected and transmitted fields, we demonstrate that the scattered states can be nonclassical. In particular, by measuring the second-order(More)
We address recent advances in microwave quantum optics with artificial atoms in one-dimensional (1D) open space. This field relies on the fact that the coupling between a superconducting artificial atom and propagating microwave photons in a 1D open transmission line can be made strong enough to observe quantum coherent effects, without using any cavity to(More)
Joel Lindkvist,1 Carlos Sabı́n,2 Ivette Fuentes,2 Andrzej Dragan,3 Ida-Maria Svensson,1 Per Delsing,1 and Göran Johansson1 1Microtechnology and Nanoscience, MC2, Chalmers University of Technology, S-41296 Göteborg, Sweden 2School of Mathematical Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom 3Institute of Theoretical(More)
We show that motion and gravity affect the precision of quantum clocks. We consider a localised quantum field as a fundamental model of a quantum clock moving in spacetime and show that its state is modified due to changes in acceleration. By computing the quantum Fisher information we determine how relativistic motion modifies the ultimate bound in the(More)
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