Microwave Quantum Acoustic Processor

Arrangoiz-Arriola, Patricio; Wollack, E. Alex; Pechal, Marek; Jiang, Wentao; Wang, Zhaoyou; McKenna, Timothy P.; Witmer, Jeremy D.; Laer, Raphaël Van; Cleland, Agnetta Y.; Lee, Nathan; Sarabalis, Christopher J.; Stas, Pieter-Jan

doi:10.1109/mwsym.2019.8700733

Cited by 2 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A recently proposed QAD computing architecture envisions a single (or a few) qubit(s) coupled to multiple nanomechanical Frequency (GHz) Frequency (GHz) resonators, with the goals of reducing technological complexity and computational bottlenecks, and improving computational efficiency 9 . From a practical perspective, such a QAD architecture should have a compact form-factor with electronic drive/readout interfaces.…”

Section: Discussionmentioning

confidence: 99%

“…The use of microscale acoustic transducers as phonon sources and cavities enables chip-scale fabrication and electrical drive/ sense/control systems, significantly reducing footprint, power consumption, and complexity, as compared with off-chip macroscale phonon sources such as optomechanically transduced quartz resonators 6,7 . These factors become especially critical as we attempt to scale from single qubit-phonon interactions to arrays of qubit-phonon coupled devices 8,9 . Microfabricated acoustic transducers, including flexural beam resonators, surface acoustic wave (SAW) and bulk acoustic wave (BAW) cavity resonators can be easily adapted for use as phonon sources in QAD systems.…”

mentioning

confidence: 99%

“…Microfabricated acoustic transducers, including flexural beam resonators, surface acoustic wave (SAW) and bulk acoustic wave (BAW) cavity resonators can be easily adapted for use as phonon sources in QAD systems. Various combinations of materials, transducers, phonon modes, and qubit types have been successfully demonstrated in recent studies; [2][3][4][5][8][9][10][11][12][13][14][15][16] of these the high-overtone bulk acoustic resonator (HBAR) (also known as an overtone or composite BAW resonator) is a prime candidate as a compact microfabricated low-loss phonon source. The HBAR is a simple and robust BAW resonator conventionally made by sputter depositing a transducer comprised of a piezoelectric film sandwiched between metal electrodes onto a thicker low-loss substrate (in this context, a substrate that has very low intrinsic phonon loss).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Epitaxial bulk acoustic wave resonators as highly coherent multi-phonon sources for quantum acoustodynamics

et al. 2020

View full text Add to dashboard Cite

Solid-state quantum acoustodynamic (QAD) systems provide a compact platform for quantum information storage and processing by coupling acoustic phonon sources with superconducting or spin qubits. The multi-mode composite high-overtone bulk acoustic wave resonator (HBAR) is a popular phonon source well suited for QAD. However, scattering from defects, grain boundaries, and interfacial/surface roughness in the composite transducer severely limits the phonon relaxation time in sputter-deposited devices. Here, we grow an epitaxial-HBAR, consisting of a metallic NbN bottom electrode and a piezoelectric GaN film on a SiC substrate. The acoustic impedance-matched epi-HBAR has a power injection efficiency >99% from transducer to phonon cavity. The smooth interfaces and low defect density reduce phonon losses, yielding (f × Q) and phonon lifetimes up to 1.36 × 10 17 Hz and 500 µs respectively. The GaN/NbN/SiC epi-HBAR is an electrically actuated, multi-mode phonon source that can be directly interfaced with NbN-based superconducting qubits or SiC-based spin qubits.

show abstract

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Epitaxial bulk acoustic wave resonators as highly coherent multi-phonon sources for quantum acoustodynamics

et al. 2020

View full text Add to dashboard Cite

show abstract

Temperature evolution of frequency and anharmonic phonon loss for multi-mode epitaxial HBARs

Gokhale

Downey

Katzer

et al. 2020

Applied Physics Letters

View full text Add to dashboard Cite

This Letter reports measured cryogenic temperature trends for over 300 longitudinal phonon modes spanning >10 GHz in an epitaxial GaN/NbN/SiC high overtone bulk acoustic resonator (epi-HBAR). We present temperature profiles from 7.2 K to 200 K for the mode frequency (f), the quality factor (Q), the figure of merit (f×Q), and the phonon loss or attenuation coefficient (α). We show that for all m phonon modes, fmT follows an identical parabolic trend, with a zero-slope turnover temperature of 35 K. Thus, the epi-HBAR comb spectrum can be considered an ensemble of modes with the same temperature dependencies, potentially enabling the design of precise multi-mode temperature-stable RF oscillators and clocks operating at GHz frequencies. Using temperature trends for (f×Q)m and αm, we provide strong evidence that the epi-HBARs are fundamentally limited by anharmonic phonon scattering in the materials that make up the epi-HBAR. Crucially, we unambiguously demonstrate the evolution of this anharmonic phonon scattering from the low frequency Akhiezer scattering regime αm∝T1 to the high frequency Landau–Rumer scattering regime αm∝T4, using hundreds of phonon modes in the same device. Finally, we show that at extremely low temperatures, other emergent loss mechanisms overshadow anharmonic phonon scattering. This finding motivates further investigation into the root causes of these limiting mechanisms for precision RF signal processing, quantum acoustodynamics, and other applications that require extremely low loss micromechanical devices.

show abstract

Microwave Quantum Acoustic Processor

Cited by 2 publications

References 11 publications

Epitaxial bulk acoustic wave resonators as highly coherent multi-phonon sources for quantum acoustodynamics

Epitaxial bulk acoustic wave resonators as highly coherent multi-phonon sources for quantum acoustodynamics

Temperature evolution of frequency and anharmonic phonon loss for multi-mode epitaxial HBARs

Contact Info

Product

Resources

About