Enhanced quasiparticle lifetime in a superconductor by selective blocking of recombination phonons with a phononic crystal

Rostem, Karwan; Visser, Pieter de; Wollack, Edward J.

doi:10.1103/physrevb.98.014522

Cited by 11 publications

(11 citation statements)

References 34 publications

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“…Utilizing the advanced methods of nanofabrication and cavity optomechanics has provided a new toolkit to explore quantum acoustodynamics in solid-state materials. Continued studies of the behavior of TLS in similar engineered nanostructures to the OMC cavity of this work may lead to, among other things, new approaches to modifying the behavior of quasi-particles in superconductors [33], mitigating decoherence in superconducting [34,35] and color center [36,37] qubits, and even new coherent TLS-based qubit states in strong coupling with an acoustic cavity [38]. The extremely small motional mass (m eff = 136 fg [14]) and narrow linewidth of the OMC cavity also make it ideal for precision mass sensing [39] and in exploring limits to alternative quantum collapse models [40].…”

Section: Cationmentioning

confidence: 98%

Nano-acoustic resonator with ultralong phonon lifetime

MacCabe

Ren

Luo

et al. 2020

Science

233

145

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The energy damping time in a mechanical resonator is critical to many precision metrology applications, such as timekeeping and force measurements. We present measurements of the phonon lifetime of a microwave-frequency, nanoscale silicon acoustic cavity incorporating a phononic bandgap acoustic shield. Using pulsed laser light to excite a colocalized optical mode of the cavity, we measured the internal acoustic modes with single-phonon sensitivity down to millikelvin temperatures, yielding a phonon lifetime of up to τph,0≈1.5 seconds (quality factor Q=5×1010) and a coherence time of τcoh,0≈130 microseconds for bandgap-shielded cavities. These acoustically engineered nanoscale structures provide a window into the material origins of quantum noise and have potential applications ranging from tests of various collapse models of quantum mechanics to miniature quantum memory elements in hybrid superconducting quantum circuits.

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Section: Cationmentioning

confidence: 98%

Nano-acoustic resonator with ultralong phonon lifetime

MacCabe

Ren

Luo

et al. 2020

Science

233

145

View full text Add to dashboard Cite

show abstract

Section: Cationmentioning

confidence: 98%

Phononic bandgap nano-acoustic cavity with ultralong phonon lifetime

MacCabe,

Ren,

Luo

et al. 2019

Preprint

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We present measurements at millikelvin temperatures of the microwave-frequency acoustic properties of a crystalline silicon nanobeam cavity incorporating a phononic bandgap clamping structure for acoustic confinement. Utilizing pulsed laser light to excite a co-localized optical mode of the nanobeam cavity, we measure the dynamics of cavity acoustic modes with single-phonon sensitivity. Energy ringdown measurements for the fundamental 5 GHz acoustic mode of the cavity shows an exponential increase in phonon lifetime versus number of periods in the phononic bandgap shield, increasing up to τ ph,0 ≈ 1.5 seconds. This ultralong lifetime, corresponding to an effective phonon propagation length of several kilometers, is found to be consistent with damping from non-resonant two-level system defects on the surface of the silicon device. Potential applications of these ultracoherent nanoscale mechanical resonators range from tests of various collapse models of quantum mechanics to miniature quantum memory elements in hybrid superconducting quantum circuits.

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“…133 Traps for phonons can be constructed using absorptive materials 134 or by harnessing phonon bandgap and bandstop structures originally designed to stop phonon recombination. 135…”

Section: [H3] Trapping Structuresmentioning

confidence: 99%

Engineering high-coherence superconducting qubits

Siddiqi

2021

Nat Rev Mater

145

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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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Enhanced quasiparticle lifetime in a superconductor by selective blocking of recombination phonons with a phononic crystal

Cited by 11 publications

References 34 publications

Nano-acoustic resonator with ultralong phonon lifetime

Nano-acoustic resonator with ultralong phonon lifetime

Phononic bandgap nano-acoustic cavity with ultralong phonon lifetime

Engineering high-coherence superconducting qubits

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