Passive Superconducting Circulator on a Chip

Navarathna, Rohit; Le, Dat Thanh; Hamann, Andrés Rosario; Nguyen, Hien D.; Stace, Thomas M.; Fedorov, Arkady

doi:10.1103/physrevlett.130.037001

Cited by 11 publications

(6 citation statements)

References 33 publications

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“…4 g suggests up to −10 dB of squeezing could be reached with the existing setup if the insertion loss were the only factor degrading squeezing. Whilst already low, the − 0.34 dB of insertion loss could be reduced further by integrating the squeezing devices within the same enclosure as the circulator, circumventing the need for connectors along the squeezed state path, or fully integrating the two KIPAs using on-chip circulators 29 , 30 .…”

Section: Discussionmentioning

confidence: 99%

Strong microwave squeezing above 1 Tesla and 1 Kelvin

Vaartjes,

Kringhøj,

Vine

et al. 2024

Nat Commun

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Squeezed states of light have been used extensively to increase the precision of measurements, from the detection of gravitational waves to the search for dark matter. In the optical domain, high levels of vacuum noise squeezing are possible due to the availability of low loss optical components and high-performance squeezers. At microwave frequencies, however, limitations of the squeezing devices and the high insertion loss of microwave components make squeezing vacuum noise an exceptionally difficult task. Here we demonstrate direct measurements of high levels of microwave squeezing. We use an ultra-low loss setup and weakly-nonlinear kinetic inductance parametric amplifiers to squeeze microwave noise 7.8(2) dB below the vacuum level. The amplifiers exhibit a resilience to magnetic fields and permit the demonstration of large squeezing levels inside fields of up to 2 T. Finally, we exploit the high critical temperature of our amplifiers to squeeze a warm thermal environment, achieving vacuum level noise at a temperature of 1.8 K. These results enable experiments that combine squeezing with magnetic fields and permit quantum-limited microwave measurements at elevated temperatures, significantly reducing the complexity and cost of the cryogenic systems required for such experiments.

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Section: Discussionmentioning

confidence: 99%

Strong microwave squeezing above 1 Tesla and 1 Kelvin

Vaartjes,

Kringhøj,

Vine

et al. 2024

Nat Commun

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“…One scheme for an alternative circulator is, on the face of it, very appealing. It involves a simple circuit, a ring of three Josephson junctions, with a non-zero external flux through the ring [123,124]. The three nodes define the three ports of the device, with the other terminal of the ports in each case being ground.…”

Section: Nonreciprocity In Actionmentioning

confidence: 99%

Lecture Notes on Quantum Electrical Circuits

Ciani,

DiVincenzo,

Terhal

2024

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During the last 30 years, stimulated by the quest to build superconducting quantum processors, a theory of quantum electrical circuits has emerged, and this theory goes under the name of circuit quantum electrodynamics or circuit-QED. The theory aims to provide a quantum description of the most relevant degrees of freedom. The central objects to be derived and studied are the Lagrangian and the Hamiltonian governing these degrees of freedom. Central concepts in classical network theory such as impedance and scattering matrices can be used to obtain the Hamiltonian and Lagrangian description for the lossless (linear) part of the circuits. Methods of analysis, both classical and quantum, can also be developed for nonreciprocal circuits. These lecture notes aim at giving a pedagogical, theoretically oriented overview of this subject for Master or PhD students in physics and electrical engineering.

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“…Moreover, these available components are based on ferrites, detrimental for quantum circuits [90,[93][94][95]. Recently, researchers have found several alternatives that are both on-chip and ferrite free, progressing toward the commercialization in the near future [96][97][98][99][100][101][102][103][104]. Within quantum thermodynamics, heat rectification by an artificial atom is a hot topic useful for management of heat dissipated from superconducting quantum circuits.…”

Section: Thermal Diodementioning

confidence: 99%

Applications of Superconductor–Normal Metal Interfaces

Lemziakov,

Karimi,

Nakamura

et al. 2024

J Low Temp Phys

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The importance and non-trivial properties of superconductor normal metal interfaces were discovered by Alexander Fyodorovich Andreev more than 60 years ago. Only much later, these hybrids have found wide interest in applications such as thermometry and refrigeration, electrical metrology, and quantum circuit engineering. Here we discuss the central properties of such interfaces and describe some of the most prominent and recent applications of them.

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Passive Superconducting Circulator on a Chip

Cited by 11 publications

References 33 publications

Strong microwave squeezing above 1 Tesla and 1 Kelvin

Strong microwave squeezing above 1 Tesla and 1 Kelvin

Lecture Notes on Quantum Electrical Circuits

Applications of Superconductor–Normal Metal Interfaces

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