Wigner distribution for the cubic phase state
Wigner distribution for the cubic phase state |γ,r. (a) Obtained from a master equation simulation with the Hamiltonian and single-photon loss rate κ/2π=50kHz by sequentially applying the squeezing and cubic phase gate to an initial vacuum state |0. (b) Ideal cubic phase state with matched cubicity γ0.1 and squeezing r0.70(6dB).

Universal Gate Set for Continuous-Variable Quantum Computation with Microwave Circuits

Researchers from WACQT, Chalmers has toghether with researchers from RWTH and Queen’s University presented a novel proposal for harnessing properties of a recently developed superconducting circuit element in order to realize long-standing goals in continuous-variable quantum computing. For almost two decades this has primarily been pursued in the context of optical systems. 

The work heralds further research in an area that could be referred to as “continuous-variable – noisy intermediate-scale quantum” (CV-NISQ) algorithms. 

Authors and affiliations:

Timo Hillmann1,2, Fernando Quijandría1, Göran Johansson1, Alessandro Ferraro3, Simon​e Gasparinetti1, and Giulia Ferrini1

Phys. Rev. Lett. 125, 160501 – Published 12 October 2020

Read the article in Physical Review Letters

1/ Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
2/ Institut für Theorie der Statistischen Physik, RWTH Aachen, 52056 Aachen, Germany
3/ Centre for Theoretical Atomic, Molecular and Optical Physics, Queen’s University Belfast, Belfast BT7 1NN, United Kingdom​

Published: Fri 06 Nov 2020.