Frequency-tunable Kerr-free three-wave mixing with a gradiometric SNAIL

Miano, Alessandro; Liu, G.; Sivak, Volodymyr; Frattini, Nicholas; Joshi, Vidul; Dai, Wei; Frunzio, Luigi; Devoret, Michel

doi:10.1063/5.0083350

Cited by 11 publications

(2 citation statements)

References 9 publications

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“…The other type is based on Josephson junctions. [9][10][11][12] Due to their high nonlinearity, this type of amplifier requires less pump power and the chip size is smaller. JTWPAs meet the needs of multi-qubit measurement and control systems and can also be applied in astronomical detection.…”

Section: Introductionmentioning

confidence: 99%

Harmonic balance simulation of the influence of component uniformity and reliability on the performance of a Josephson traveling wave parametric amplifier

Zheng 郑,

Xiong 熊,

Feng 冯

et al. 2024

Chinese Phys. B

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The Josephson Traveling Wave Parametric Amplifier (JTWPA), which is a quantum-limited amplifier with high gain and large bandwidth, is the core device of large-scale measurement and control systems for quantum computing. A typical JTWPA consists of thousands of Josephson junctions (JJs) connected in series to form a transmission line, and hundreds of shunt LC resonators periodically loaded along the line for phase matching. Because the variation of these capacitors and inductors can be detrimental to its high frequency characteristics, the fabrication of a JTWPA typically necessitates precise processing equipment. To guide the fabrication process and further improve the design for manufacturability, it is necessary to understand how each electronic component affects the amplifier. In this letter, by using the harmonic balance method, we conduct a comprehensive study on the impact of nonuniformity and fabrication yield of the electronic components on the performance of JTWPA. The results provide insightful and scientific guidance for device design and fabrication processes.

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Section: Introductionmentioning

confidence: 99%

Harmonic balance simulation of the influence of component uniformity and reliability on the performance of a Josephson traveling wave parametric amplifier

Zheng 郑,

Xiong 熊,

Feng 冯

et al. 2024

Chinese Phys. B

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“…The proposed device is similar to a parametric amplifier where the Josephson junction or SQUID loop is replaced by an asymmetric Josephson device known as the SNAIL (Superconducting Nonlinear Asymmetric Inductive eLement) 31,32 , is applied. Using a SNAIL or an asymmetrically threaded SQUID loop 33,34 , it is possible to realize three-wave mixing free of residual Kerr interactions by biasing the element at a certain external magnetic flux. In this work, we refer to this flux spot as the Kerr-free point.…”

Section: Introductionmentioning

confidence: 99%

Resolving Fock states near the Kerr-free point of a superconducting resonator

Lu,

Kudra,

Hillmann

et al. 2023

npj Quantum Inf

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We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Nonlinear Asymmetric Inductive eLement). Such a device possesses a Kerr-free point in which the external magnetic flux allows to suppress the Kerr interaction. We have excited photons near this Kerr-free point and characterized the device using a transmon qubit. The excitation spectrum of the qubit allows to observe photon-number-dependent frequency shifts about nine times larger than the qubit linewidth. Our study demonstrates a compact integrated platform for continuous-variable quantum processing that combines large couplings, considerable relaxation times and excellent control over the photon mode structure in the microwave domain.

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Universal control of a bosonic mode via drive-activated native cubic interactions

Eriksson,

Sépulcre,

Kervinen

et al. 2024

Nat Commun

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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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Frequency-tunable Kerr-free three-wave mixing with a gradiometric SNAIL

Cited by 11 publications

References 9 publications

Harmonic balance simulation of the influence of component uniformity and reliability on the performance of a Josephson traveling wave parametric amplifier

Harmonic balance simulation of the influence of component uniformity and reliability on the performance of a Josephson traveling wave parametric amplifier

Resolving Fock states near the Kerr-free point of a superconducting resonator

Universal control of a bosonic mode via drive-activated native cubic interactions

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