Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 45: Transport: Quantum Coherence and Quantum Information Systems - Experiment (jointly with MA, HL)
HL 45.11: Talk
Wednesday, March 22, 2017, 12:15–12:30, HSZ 03
Engineering the parity of light-matter interaction in superconducting circuits — •J. Goetz1, C. Besson1,2, P. Eder1,2,3, M. Fischer1,2,3, S. Pogorzalek1,2,3, E. Xie1,2,3, K.G. Fedorov1,2, F. Deppe1,2,3, A. Marx1, and R. Gross1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik-Department, TU München, 85748 Garching, Germany — 3Nanosystems Initiative Munich (NIM), 80799 München, Germany
In physics, parity describes the symmetry properties of quantum states and operators under spatial inversion. It has manifold applications in the standard model, quantum information and field theory. We present a novel technique for the in-situ control of the interaction operator parity in superconducting quantum circuits. Using a tunable-gap gradiometric flux qubit, which exhibits both a dipole and a quadrupole moment, we can precisely engineer the interaction parity with spatially shaped microwave fields. Our highly symmetric sample architecture enables a complete parity inversion and the observation of transparency induced by longitudinal coupling. In a second step, we couple the qubit to a resonator and, in this way, activate quadrupolar transitions similar to those in multi-electron atoms. Our work paves the way towards parity based quantum simulation and physical applications based on longitudinal light-matter interaction.
The authors acknowledge support from DFG through FE 1564/1-1, the doctorate program ExQM of the Elite Network of Bavaria, and the IMPRS ‘Quantum Science and Technology’.