Description:

To unlock the potential of quantum computers, one of the key challenges that the field has to overcome is to preserve the coherence of a quantum superposition over extended times. Besides implementing quantum error correction schemes, a complementary approach to prolong the coherence of quantum processors is to develop qubits that are intrinsically protected against decoherence. In this talk, first, we introduce the requirement for intrinsic error protection [1] while highlighting the importance of novel nonlinear elements, including high-transmission Josephson junctions [2] and quantum phase slip elements. In the second part of the talk, we present recent experimental results on using disordered superconductors to build superconducting qubits with unconventional nonlinear and linear elements. In particular, we focus on elements built from disordered WSi high-kinetic inductance material which has shown excellent properties in single photon detectors.

[1] PRX Quantum 2, 030101 (2021)
[2] PRX Quantum 3, 030303 (2022)

Andras Gyenis, Assistant Professor, University of Colorado, Boulder

Host: Jens Koch