146 citations · 436 across the 13 of their papers we have counts for
13 papers
Damping-dependent thermalization of neighboring nanomechanical resonators below 1 mK
Amir Youssefi, Mahdi Chegnizadeh, Francis Bettsworth +4
The position noise spectra of six drums on a single chip were measured on a single cooldown below 1.3 kelvin. Cryostat temperatures as low as 0.7 mK were achieved. The temperature…
Nonclassical microwave radiation from the parametric dynamical Casimir effect in the reversed-dissipation regime of circuit optomechanics
H. Solki, Ali Motazedifard, M. H. Naderi +2
We propose an experimentally feasible optomechanical system (OMS) that is dispersively driven and operates in the reversed dissipation regime (RDR), where the mechanical damping ra…
Realization of tilted Dirac-like microwave cone in superconducting circuit lattices
Amir Youssefi, Ahmad Motavassal, Shingo Kono +2
Dirac-like band crossings are paradigms in condensed matter systems to emulate high-energy physics phenomena. They are associated with two aspects: gap and tilting. The ability to…
Compact superconducting vacuum-gap capacitors with low microwave loss and high mechanical coherence for scalable quantum circuits
Amir Youssefi, Mahdi Chegnizadeh, Marco Scigliuzzo +1
Vacuum-gap capacitors have recently attracted significant interest in superconducting circuit platforms due to their compact design and exceptionally low dielectric losses in the m…
Quantum collective motion of macroscopic mechanical oscillators
Mahdi Chegnizadeh, Marco Scigliuzzo, Amir Youssefi +3
Collective phenomena arise from interactions within complex systems, leading to behaviors absent in individual components. Observing quantum collective phenomena with macroscopic m…
Polaris: A Safety-focused LLM Constellation Architecture for Healthcare
Subhabrata Mukherjee, Paul Gamble, Markel Sanz Ausin +23
We develop Polaris, the first safety-focused LLM constellation for real-time patient-AI healthcare conversations. Unlike prior LLM works in healthcare focusing on tasks like questi…
Mechanically Induced Correlated Errors on Superconducting Qubits with Relaxation Times Exceeding 0.4 Milliseconds
Shingo Kono, Jiahe Pan, Mahdi Chegnizadeh +4
Superconducting qubits are one of the most advanced candidates to realize scalable and fault-tolerant quantum computing. Despite recent significant advancements in the qubit lifeti…
A squeezed mechanical oscillator with milli-second quantum decoherence
Amir Youssefi, Shingo Kono, Mahdi Chegnizadeh +1
An enduring challenge in constructing mechanical oscillator-based hybrid quantum systems is to ensure engineered coupling to an auxiliary degree of freedom while maintaining good m…
Topological lattices realized in superconducting circuit optomechanics
Amir Youssefi, Shingo Kono, Andrea Bancora +4
Cavity optomechanics enables controlling mechanical motion via radiation pressure interaction, and has contributed to the quantum control of engineered mechanical systems ranging f…
Cryogenic electro-optic interconnect for superconducting devices
Amir Youssefi, Itay Shomroni, Yash J. Joshi +5
Encoding information onto optical fields is the backbone of modern telecommunication networks. Optical fibers offer low loss transport and vast bandwidth compared to electrical cab…
Two-Tone Optomechanical Instability and Its Fundamental Implications for Backaction-Evading Measurements
Itay Shomroni, Amir Youssefi, Nick Sauerwein +5
While quantum mechanics imposes a fundamental limit on the precision of interferometric measurements of mechanical motion due to measurement backaction, the nonlinear nature of the…
Quantitative measure for the spin-charge separation in two dimensional Hubbard model
Amir Youssefi, M. Ansari-Fard, S. A. Jafari
We introduce a qauantitative measure of spin-charge separation, which is based on the difference between the fluctuations with respect to background of the spin and charge p…
Analog computing by Brewster effect
Amir Youssefi, Farzad Zangeneh-Nejad, Sajjad AbdollahRamezani +1
Optical computing has emerged as a promising candidate for real-time and parallel continuous data processing. Motivated by recent progresses in metamaterial-based analog computing…