Joint Annual Meeting of ÖPG and SPS 2021

【501】Coherent control of a symmetry-engineered multi-qubit dark state in waveguide quantum electrodynamics

31 Aug 2021, 16:30

15m

Room F

Talk Quantum Information and Quantum Computing Quantum Information and Quantum Computing

Speaker

Mr Maximilian Zanner (University of Innsbruck)

Description

The coherence properties of an atom or superconducting qubit strongly depend on the electromagnetic environment. In waveguide QED the qubit is strongly coupled to a continuous mode spectrum, thus it decays rapidly. Collective effects between multiple qubits can be utilized to generate subradiant states that decouple from the dissipative waveguide environment.
In our experiment we strongly couple two pairs of transmon qubits to the fundamental mode of a rectangular waveguide. We show that the decay of the dark state is strongly suppressed, exceeding the waveguide-limited lifetimes of individual qubits by two orders of magnitude. Our experiment presents a step towards implementations of quantum many-body simulations in open quantum systems.