Robust Preparation of Wigner-Negative States with Optimized SNAP-Displacement Sequences
Journal article, 2022

Hosting nonclassical states of light in three-dimensional microwave cavities has emerged as a promising paradigm for continuous-variable quantum information processing. Here we experimentally demonstrate high-fidelity generation of a range of Wigner-negative states useful for quantum computation, such as Schrodinger-cat states, binomial states, Gottesman-Kitaev-Preskill states, as well as cubic phase states. The latter states have been long sought after in quantum optics and have never been achieved experimentally before. We use a sequence of interleaved selective number-dependent arbitrary phase (SNAP) gates and displacements. We optimize the state preparation in two steps. First we use a gradient-descent algorithm to optimize the parameters of the SNAP and displacement gates. Then we optimize the envelope of the pulses implementing the SNAP gates. Our results show that this way of creating highly nonclassical states in a harmonic oscillator is robust to fluctuations of the system parameters such as the qubit frequency and the dispersive shift.

Author

Marina Kudra

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Mikael Kervinen

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Ingrid Strandberg

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Shahnawaz Ahmed

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Marco Scigliuzzo

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Amr Osman

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Daniel Perez Lozano

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Mats O. Tholen

Royal Institute of Technology (KTH)

Riccardo Borgani

Royal Institute of Technology (KTH)

David B. Haviland

Royal Institute of Technology (KTH)

Giulia Ferrini

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Jonas Bylander

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Anton Frisk Kockum

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Isaac Fernando Quijandria Diaz

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Per Delsing

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Simone Gasparinetti

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

PRX Quantum

26913399 (eISSN)

Vol. 3 3 030301

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Condensed Matter Physics

DOI

10.1103/PRXQuantum.3.030301

More information

Latest update

4/21/2023