Universal control of a bosonic mode via drive-activated native cubic interactions
Artikel i vetenskaplig tidskrift, 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.
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Publicerad i

Nature Communications

2041-1723 (ISSN) 20411723 (eISSN)

Vol. 15 Nummer/häfte 1 art. nr 2512

Forskningsprojekt

Wallenberg Centre for Quantum Technology (WACQT)

Knut och Alice Wallenbergs Stiftelse (KAW 2017.0449, KAW2021.0009, KAW2022.0006), 2018-01-01 -- 2030-03-31.

Kategorisering

Ämneskategorier (SSIF 2011)

Atom- och molekylfysik och optik

Annan fysik

Reglerteknik

Den kondenserade materiens fysik

Identifikatorer

DOI

10.1038/s41467-024-46507-1

PubMed

38509084

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Senast uppdaterat

2025-01-14