Universal control of a bosonic mode via drive-activated native cubic interactions
Journal article, 2024

Linear bosonic modes offer a hardware-efficient alternative for quantum information processing but require access to some nonlinearity for universal control. The lack of nonlinearity in photonics has led to encoded measurement-based quantum computing, which relies on linear operations but requires access to resourceful (’nonlinear’) quantum states, such as cubic phase states. In contrast, superconducting microwave circuits offer engineerable nonlinearities but suffer from static Kerr nonlinearity. Here, we demonstrate universal control of a bosonic mode composed of a superconducting nonlinear asymmetric inductive element (SNAIL) resonator, enabled by native nonlinearities in the SNAIL element. We suppress static nonlinearities by operating the SNAIL in the vicinity of its Kerr-free point and dynamically activate nonlinearities up to third order by fast flux pulses. We experimentally realize a universal set of generalized squeezing operations, as well as the cubic phase gate, and exploit them to deterministically prepare a cubic phase state in 60 ns. Our results initiate the experimental field of polynomial quantum computing, in the continuous-variables notion originally introduced by Lloyd and Braunstein.

Author

Axel Eriksson

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Théo Sépulcre

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

Mikael Kervinen

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Timo Hillmann

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

Marina Kudra

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Simon Dupouy

Student at Chalmers

Yong Lu

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

University of Stuttgart

Maryam Khanahmadi

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

Jiaying Yang

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Claudia Castillo-Moreno

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Per Delsing

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Simone Gasparinetti

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Nature Communications

2041-1723 (ISSN) 20411723 (eISSN)

Vol. 15 1 2512

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Control Engineering

Condensed Matter Physics

DOI

10.1038/s41467-024-46507-1

PubMed

38509084

More information

Latest update

9/13/2024