Initial Design of a W-Band Superconducting Kinetic Inductance Qubit

Faramarzi, Farzad; Day, Peter; Glasby, Jacob; Sypkens, Sasha; Colangelo, Marco; Chamberlin, Ralph V.; Mirhosseini, Mohammad; Schmidt, Kevin; Berggren, Karl K.; Mauskopf, Philip

doi:10.1109/tasc.2021.3065304

Cited by 15 publications

(5 citation statements)

References 28 publications

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“…Currently the strongest coupler between transmons is able to generate a 100 MHz iSWAP gate [21,42], with the rate being limited by the qubit frequency and anharmonicity. Meanwhile, there is progress in pushing the transmon frequency to the millimeter-wave regime [43], which can be theoretically improved by an order of magnitude. This could allow in the future a magnitude faster iSWAP gate in the millimeter-wave regime using a similar coupler design.…”

Section: Hardware Implementationsmentioning

confidence: 99%

Error-Divisible Two-Qubit Gates

Perez

Varosy

et al. 2023

Phys. Rev. Applied

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We introduce a simple, widely applicable formalism for designing "error-divisible" two qubit gates: a quantum gate set where fractional rotations have proportionally reduced error compared to the full entangling gate. In current noisy intermediate-scale quantum (NISQ) algorithms, performance is largely constrained by error proliferation at high circuit depths, of which two-qubit gate error is generally the dominant contribution. Further, in many hardware implementations, arbitrary two-qubit rotations must be composed from multiple two-qubit stock gates, further increasing error. This work introduces a set of criteria, and example waveforms and protocols to satisfy them, using superconducting qubits with tunable couplers for constructing continuous gate sets with significantly reduced leakage and dynamic ZZ errors for small-angle rotations. If implemented at scale, NISQ algorithm performance would be significantly improved by our error-divisible gate protocols.

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Section: Hardware Implementationsmentioning

confidence: 99%

Error-Divisible Two-Qubit Gates

Perez

Varosy

et al. 2023

Phys. Rev. Applied

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“…W-band SOFTS housing with waveguide coupling has been designed and fabricated and coupling is done using a radial probe [9]. The STLs were formed from a 40 nm thick deposited niobium nitride film etched using a reactive ion etching (RIE) process.…”

Section: Optical Coupling and Device Hardwarementioning

confidence: 99%

Development of Superconducting On-chip Fourier Transform Spectrometers

et al. 2022

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Superconducting On-chip Fourier Transform Spectrometers (SOFTS) are broadband, ultra-compact and electronic interferometers. SOFTS will enable kilo-pixel spectro-imaging focal planes, enhancing sub-millimeter astrophysics and cosmology. Particular applications include cluster astrophysics, cosmic microwave background (CMB) science, and line intensity mapping. This article details the development, design and bench-marking of radio frequency (RF) on-chip architecture of SOFTS for Ka and W-bands.

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“…W-band SOFTS housing with wave-guide coupling has also been designed and fabricated. Waveguide coupling is done using a radial probe 4 . STLs were deposited with a thin film (40 nm) of Niobium Nitride (NbN) and etched using a reactive ion etching (RIE) process.…”

Section: W-bandmentioning

confidence: 99%

Superconducting On-chip Fourier Transform Spectrometer

et al. 2020

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Kinetic inductance in thin film superconductors has been used as the basis for low-temperature, low-noise photon detectors. In particular thin films such as NbTiN, TiN, NbN, the kinetic inductance effect is strongly non-linear in the applied current, which can be utilized to realize novel devices. We present results from transmission lines made with these materials, where DC (current) control is used to modulate the phase velocity thereby enabling an on-chip spectrometer. The utility of such compact spectrometers are discussed, along with their natural connection with parametric amplifiers.

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Initial Design of a W-Band Superconducting Kinetic Inductance Qubit

Cited by 15 publications

References 28 publications

Error-Divisible Two-Qubit Gates

Error-Divisible Two-Qubit Gates

Development of Superconducting On-chip Fourier Transform Spectrometers

Superconducting On-chip Fourier Transform Spectrometer

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