Surpassing the Resistance Quantum with a Geometric Superinductor

Peruzzo, Matilda; Trioni, Andrea; Hassani, Farid; Žemlička, Martin; Fink, J. M.

doi:10.1103/physrevapplied.14.044055

Cited by 48 publications

(35 citation statements)

References 47 publications

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“…The parameter values of the circuit elements needed to reach this operating regime are challenging to implement experimentally, particularly the inductances, which need to have higher impedance than the resistance quantum. Such so-called superinductors 158,159 have an impedance at the 13/32 frequency of the qubit circuit, typically in the GHz range, that is larger than h/(2e) 2 ≈ 6.5kΩ , significantly larger than the 377Ω value characteristic of free space. Recipes to fabricate these elements include using a series array of small tunneling junctions 160 , nanowires 161 , or highly disordered superconductors [162][163][164] with a large kinetic inductance, such as granular aluminum.…”

Section: [H1] Noise-protected Architecturesmentioning

confidence: 99%

Engineering high-coherence superconducting qubits

Siddiqi

2021

Nat Rev Mater

168

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Advances in materials science and engineering have played a central role in the development of classical computers, and will undoubtedly be critical in propelling the maturation of quantum information technologies. In approaches to quantum computation based on superconducting circuits, as one goes from bulk materials to functional devices, amorphous insulating films and nonequilibrium excitations-electronic and phononic-are introduced, leading to dissipation and fluctuations that limit the computational power of state-of-the-art qubits and processors. In this Review, the major sources of decoherence in superconducting qubits are identified through an exploration of seminal qubit and resonator experiments. The proposed microscopic mechanisms associated with these imperfections are summarized, and directions for future research are discussed. The trade-offs between simple qubit primitives based on a single Josephson tunnel junction and more complex designs that use additional circuit elements, or new junction modalities, to reduce sensitivity to local noise sources are discussed, particularly in the context of materials optimization strategies for each architecture.

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Section: [H1] Noise-protected Architecturesmentioning

confidence: 99%

Engineering high-coherence superconducting qubits

Siddiqi

2021

Nat Rev Mater

168

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“…One route to higher electromechanical efficiency is through increasing the impedance of the matching circuit by minimizing stray circuit capacitance, which can be achieved through reduction in the size of the impedance matching coil, as well as underetching of the circuit dielectric [34]. Through these techniques, values of C match ∼ 1 − 2 fF are readily achievable, for which we expect to boost the electromechanical efficiency by two orders of magnitude.…”

Section: Si)mentioning

confidence: 99%

Ultra-low-noise Microwave to Optics Conversion in Gallium Phosphide

Stockill¹,

Forsch²,

Hijazi³

et al. 2021

Preprint

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Mechanical resonators can act as excellent intermediaries to interface single photons in the microwave and optical domains due to their high quality factors. Nevertheless, the optical pump required to overcome the large energy difference between the frequencies can add significant noise to the transduced signal. Here we exploit the remarkable properties of thin-film gallium phosphide to demonstrate on-chip microwave-to-optical conversion, realised by piezoelectric actuation of a Gigahertz-frequency optomechanical resonator. The large optomechanical coupling and the suppression of two-photon absorption in the material allows us to operate the device at optomechanical cooperativities greatly exceeding one, and, when using a pulsed upconversion pump, induce less than one thermal noise phonon. We include a high-impedance on-chip matching resonator to mediate the mechanical load with the 50-Ω source. Our results establish gallium phosphide as a versatile platform for ultra-low-noise conversion of photons between microwave and optical frequencies.

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“…Josephson junctions (JJs) with the Josephson energy 0.1K < E J < 1K have been recently employed as nonlinear elements of superconducting qubits (see, e.g., [1][2][3][4]). Though E J of these junctions remains much greater than the physical temperature of qubits (∼ 20÷50 mK), a non-zero rate of thermally activated phase slips in these junctions might soon limit the coherence of superconducting qubits.…”

Section: Introductionmentioning

confidence: 99%

Phase Diffusion in Low-$E_J$ Josephson Junctions at milli-Kelvin Temperatures

Lu¹,

Kalashnikov²,

Kamenov³

et al. 2021

Preprint

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Josephson junctions (JJs) with Josephson energy EJ1K are widely employed as non-linear elements in superconducting circuits for quantum computing, operating at milli-Kelvin temperatures. Here we experimentally study incoherent phase slips (IPS) in low-EJ Aluminum-based JJs at T < 0.2K, where the IPS become the dominant source of dissipation. We observed strong suppression of the critical (switching) current and a very rapid growth of the zero-bias resistance with decreasing Josephson energy below EJ ∼ 1K. This behavior is attributed to the IPSs whose rate exponentially increases with decreasing the ratio EJ /T . Our observations are in line with other data reported in literature. With further improvement of coherence of superconducting qubits, the observed dissipation from IPS might limit the performance of qubits based on low-EJ junctions. Our results point the way to future improvements of such qubits.

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Surpassing the Resistance Quantum with a Geometric Superinductor

Cited by 48 publications

References 47 publications

Engineering high-coherence superconducting qubits

Engineering high-coherence superconducting qubits

Ultra-low-noise Microwave to Optics Conversion in Gallium Phosphide

Phase Diffusion in Low-$E_J$ Josephson Junctions at milli-Kelvin Temperatures

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