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1. Optimization of the spatial configuration of local defects in phononic crystals for high Q cavity

   https://doi.org/10.3389/fmech.2020.592787  

   Contreras, D.R.; Martínez, M.; Mayorga, M.; Heo, H.; Walker, E.; Neogi, A. (October 2020, Frontiers of Mechanical Engineering)

   null (Ed.)

   Defects can be introduced within a 2-D periodic lattice to realize phononic cavities or phononic crystal (PnC) waveguides at the ultrasonic frequency range. The arrangement of these defects within a PnC lattice results in the modification of the Q factor of the cavity or the waveguide. In this work, cavity defects within a PnC formed using cylindrical stainless steel scatterers in water have been modified to control the propagation and Q factor of acoustic waveguides realized through defect channels. The defects channel based waveguides within the PnC were configured horizontally, vertically, and diagonally along the direction of the propagation of the acoustic waves. Numerical simulations supported by experimental demonstration indicate that the defect-based waveguide's Q factor is improved by over 15 times for the diagonal configuration compared to the horizontal configuration. It also increases due to an increase in the scatterers' radius, varied from 0.7 -0.95 mm. 

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2. Acoustic ring resonator: Experiments and simulations

   https://doi.org/10.1063/5.0077330  

   Robertson, William_M; Vazquez, Carina; LaVerde, Alexander; Wassenberg, Austin; Olson, Colleen; Lopez, Jennifer (January 2022, AIP Advances)

   The application of acoustic ring resonator structures for the manipulation of audio frequency acoustic waves is demonstrated experimentally and via numerical simulation. Three ring resonator systems are demonstrated: a simple single ring structure that acts as a comb/notch filter, a single ring between two parallel waveguides that acts as an add-drop filter, and a sequential array of equally spaced rings that creates acoustic bandgaps. The experiments are conducted in linear waveguides using an impulse response method. The ring resonators were created via 3D printing. Finite element numerical simulations were conducted using COMSOL. 

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3. Setting the stage for materials simulation using acoustic metamaterials digital quantum analogue computing platforms

   https://doi.org/10.1088/1361-651X/ac991e  

   Deymier, P A; Runge, K; Hasan, M A; Levine, J A; Cutillas, P (October 2022, Modelling and Simulation in Materials Science and Engineering)

   Abstract We present a model of an externally driven acoustic metamaterial constituted of a nonlinear parallel array of coupled acoustic waveguides that supports logical phi-bits, classical analogues of quantum bits (qubit). Descriptions of correlated multiple phi-bit systems emphasize the importance of representations of phi-bit and multiple phi-bit vector states within the context of their corresponding Hilbert space. Experimental data are used to demonstrate the realization of the single phi-bit Hadamard gate and the phase shift gate. A three phi-bit system is also used to illustrate the development of multiple phi-bit gates as well as a simple quantum-like algorithm. These demonstrations set the stage for the implementation of a digital quantum analogue computing platform based on acoustic metamaterial that can implement quantum-like gates and may offer promise as an efficient platform for the simulation of materials. 

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4. Demonstration of a two-bit controlled-NOT quantum-like gate using classical acoustic qubit-analogues

   https://doi.org/10.1038/s41598-022-18314-5  

   Runge, Keith; Hasan, M. Arif; Levine, Joshua A.; Deymier, Pierre A. (December 2022, Scientific Reports)

   Abstract The Controlled-NOT (CNOT) gate is the key to unlock the power of quantum computing as it is a fundamental component of a universal set of gates. We demonstrate the operation of a two-bit C-NOT quantum-like gate using classical qubit acoustic analogues, called herein logical phi-bits. The logical phi-bits are supported by an externally driven nonlinear acoustic metamaterial composed of a parallel array of three elastically coupled waveguides. A logical phi-bit has a two-state degree of freedom associated with the two independent relative phases of the acoustic wave in the three waveguides. A simple physical manipulation involving the detuning of the frequency of one of the external drivers is shown to operate on the complex vectors in the Hilbert space of pairs of logical phi-bits. This operation achieves a systematic and predictable C-NOT gate with unambiguously measurable input and output. The possibility of scaling the approach to more phi-bits is promising. 

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5. Coupled Nanomechanical Graphene Resonators: A Promising Platform for Scalable NEMS Networks

   https://doi.org/10.3390/mi14112103  

   Carter, Brittany; Hernandez, Uriel F; Miller, David J; Blaikie, Andrew; Horowitz, Viva R; Alemán, Benjamín J (November 2023, Micromachines)

   Arrays of coupled nanoelectromechanical resonators are a promising foundation for implementing large-scale network applications, such as mechanical-based information processing and computing, but their practical realization remains an outstanding challenge. In this work, we demonstrate a scalable platform of suspended graphene resonators, such that neighboring resonators are persistently coupled mechanically. We provide evidence of strong coupling between neighboring resonators using two different tuning methods. Additionally, we provide evidence of inter-resonator coupling of higher-order modes, demonstrating the rich dynamics that can be accessed with this platform. Our results establish this platform as a viable option for realizing large-scale programmable networks, enabling applications such as phononic circuits, tunable waveguides, and reconfigurable metamaterials. 

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