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- Abdufarrukh A. Abdumalikov, Johannes M. Fink, +4 authors Stefan Filipp
- Nature
- 2013

The geometric aspects of quantum mechanics are emphasized most prominently by the concept of geometric phases, which are acquired whenever a quantum system evolves along a path in Hilbert space, that is, the space of quantum states of the system. The geometric phase is determined only by the shape of this path and is, in its simplest form, a real number.… (More)

- Marek Pechal, Simon Berger, +5 authors Stefan Filipp
- Physical review letters
- 2012

Steering a quantum harmonic oscillator state along cyclic trajectories leads to a path-dependent geometric phase. Here we describe its experimental observation in an electronic harmonic oscillator. We use a superconducting qubit as a nonlinear probe of the phase, which is otherwise unobservable due to the linearity of the oscillator. We show that the… (More)

- Simone Gasparinetti, Marek Pechal, Jean-Claude Besse, Mintu Mondal, Christopher Eichler, Andreas Wallraff
- Physical review letters
- 2017

We use a three-level artificial atom in the ladder configuration as a source of correlated, single microwave photons of different frequency. The artificial atom, a transmon-type superconducting circuit, is driven at the two-photon transition between ground and second-excited state, and embedded into an on-chip switch that selectively routes… (More)

- Simone Gasparinetti, Simon Berger, Abdufarrukh A. Abdumalikov, Marek Pechal, Stefan Filipp, Andreas Wallraff
- Science advances
- 2016

Berry's geometric phase naturally appears when a quantum system is driven by an external field whose parameters are slowly and cyclically changed. A variation in the coupling between the system and the external field can also give rise to a geometric phase, even when the field is in the vacuum state or any other Fock state. We demonstrate the appearance of… (More)

- Simon Berger, Marek Pechal, +7 authors Stefan Filipp
- Nature communications
- 2015

A quantum system interacting with its environment is subject to dephasing, which ultimately destroys the information it holds. Here we use a superconducting qubit to experimentally show that this dephasing has both dynamic and geometric origins. It is found that geometric dephasing, which is present even in the adiabatic limit and when no geometric phase is… (More)

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