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
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 2512Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Control Engineering
Condensed Matter Physics
DOI
10.1038/s41467-024-46507-1
PubMed
38509084