210 citations · 601 across the 25 of their papers we have counts for
25 papers
Scattering-Induced Loss in Ferroelectric Photonic Devices
Jonah Townsend, Enzo Conceição Picinini, Rogério de Sousa
Ferroelectric materials have colossal optical nonlinearities, but their integration into quantum photonic chips is made challenging by the additional loss mechanisms that they intr…
Anisotropic magnon transport in an antiferromagnetic trilayer heterostructure: is BiFeO an altermagnet?
Sajid Husain, Maya Ramesh, Qian Song +18
Magnons provide a route to ultra-fast transport and non-destructive readout of spin-based information transfer. Here, we report magnon transport and its emergent anisotropic nature…
Resonant squeezed light from photonic Cooper pairs
Sanker Timsina, Taha Hammadia, Sahar Gholami Milani +3
Raman scattering of photons into phonons gives rise to entangled photon pairs when the phonon emitted in a Stokes process is coherently absorbed in antiStokes scattering, forming t…
Fast quantum gate design with deep reinforcement learning using real-time feedback on readout signals
Emily Wright, Rogério de Sousa
The design of high-fidelity quantum gates is difficult because it requires the optimization of two competing effects, namely maximizing gate speed and minimizing leakage out of the…
Model for 1/f Flux noise in Superconducting Aluminum Devices: Impact of External Magnetic Fields
José Alberto Nava Aquino, Rogério de Sousa
Superconducting quantum interference devices (SQUIDs) and related circuits made of aluminum are known to display flux noise, where is frequency. A recent experiment showe…
Flux noise in disordered spin systems
José Alberto Nava Aquino, Rogério de Sousa
Impurity spins randomly distributed at the surfaces and interfaces of superconducting wires are known to cause flux noise in Superconducting Quantum Interference Devices, providing…
Modelling dielectric loss in superconducting resonators: Evidence for interacting atomic two-level systems at the Nb/oxide interface
N. Gorgichuk, T. Junginger, R. de Sousa
While several experiments claim that two-level system (TLS) defects in amorphous surfaces/interfaces are responsible for energy relaxation in superconducting resonators and qubits,…
Confined Magnons
Seamus Beairsto, Maximilien Cazayous, Randy S. Fishman +1
Magnetic structures are known to possess magnon excitations confined to their surfaces and interfaces, but these spatially localized modes are often not resolved in spectroscopy ex…
Noise Mitigation with Delay Pulses in the IBM Quantum Experience
Sam Tomkins, Rogério de Sousa
One of the greatest challenges for current quantum computing hardware is how to obtain reliable results from noisy devices. A recent paper [A. Kandala et al., Nature 567, 491 (2019…
Impact of the surface phase transition on magnon and phonon excitations in BiFeO3 nanoparticles
Ian Aupiais, Pierre Hemme, Marc Allen +8
We have performed Raman scattering measurements on BiFeO3 nanoparticles and studied both magnetic and lattice modes. We reveal strong anomalies between 140 K and 200 K in the frequ…
Intrinsic Photon Loss at the Interface of Superconducting Devices
Igor Diniz, Rogério de Sousa
We present a quantum theory of dielectric energy loss arising from the piezoelectric coupling between photons and phonons in superconducting devices. Photon loss is shown to occur…
Size-dependent bistability in multiferroic nanoparticles
Marc Allen, Ian Aupiais, Maximilien Cazayous +1
Most multiferroic materials with coexisting ferroelectric and magnetic order exhibit cycloidal antiferromagnetism with wavelength of several nanometers. The prototypical example is…
Impact of nonlocal electrodynamics on flux noise and inductance of superconducting wires
Pramodh Senarath Yapa, Tyler Makaro, Rogério de Sousa
We present exact numerical calculations of supercurrent density, inductance, and impurity-induced flux noise of cylindrical superconducting wires in the nonlocal Pippard regime, wh…
Driving spin excitations by hydrostatic pressure in BiFeO3
J. Buhot, C. Toulouse, Y. Gallais +10
Optical spectroscopy has been combined with computational and theoretical techniques to show how the spin dynamics in the model multiferroic BiFeO3 responds to the application of h…
Spin versus charge noise from Kondo traps
Luis G. G. V. Dias da Silva, Rogerio de Sousa
Magnetic and charge noise have common microscopic origin in solid state devices, as described by a universal electron trap model. In spite of this common origin, magnetic (spin) an…
Flux-vector model of spin noise in superconducting circuits: Electron versus nuclear spins and role of phase transition
S. LaForest, Rogerio de Sousa
Superconducting Quantum Interference Devices (SQUIDs) and other superconducting circuits are limited by intrinsic flux noise with spectral density with whose origin i…
Evidence for temperature dependent spin-diffusion as a mechanism of intrinsic flux noise in SQUIDs
T. Lanting, M. H. Amin, A. J. Berkley +4
The intrinsic flux noise observed in superconducting quantum interference devices (SQUIDs) is thought to be due to the fluctuation of electron spin impurities, but the frequency an…
Theory of spin-orbit enhanced electric-field control of magnetism in multiferroic BiFeO3
Rogerio de Sousa, Marc Allen, Maximilien Cazayous
We present a microscopic theory that shows the importance of spin-orbit coupling in perovskite compounds with heavy ions. In BiFeO3 (BFO) the spin-orbit coupling at the bismuth ion…
Quantum read-out and fast initialization of nuclear spin qubits with electric currents
Noah Stemeroff, Rogerio de Sousa
Nuclear spin qubits have the longest coherence times in the solid state, but their quantum read-out and initialization is a great challenge. We present a theory for the interaction…
Neuron dynamics in the presence of 1/f noise
Cameron Sobie, Arif Babul, Rogerio de Sousa
Interest in understanding the interplay between noise and the response of a non-linear device cuts across disciplinary boundaries. It is as relevant for unmasking the dynamics of n…
Observation of electromagnon excitations in the BiFe0 spiral magnet
M. Cazayous, Y. Gallais, A. Sacuto +3
Recently, oxide multiferroics have attracted much attention due to their large magnetoelectric effect which allows the tuning of magnetic properties with electric field and vice ve…
Spin quantum computation in silicon nanostructures
S. Das Sarma, Rogerio de Sousa, Xuedong Hu +1
Proposed silicon-based quantum-computer architectures have attracted attention because of their promise for scalability and their potential for synergetically utilizing the availab…
Decoherence and dephasing in spin-based solid state quantum computers
Xuedong Hu, Rogerio de Sousa, S. Das Sarma
We discuss the operational definition of decoherence in various solid state systems. In particular, we review, in the context of spin-based solid state quantum computation, the int…
Interplay between Zeeman Coupling and Swap Action in Spin-based Quantum Computer Models: Error Correction in Inhomogeneous Magnetic Fields
Xuedong Hu, Rogerio de Sousa, S. Das Sarma
We consider theoretically the interplay between Zeeman coupling and exchange-induced swap action in spin-based quantum dot quantum computer models in the presence of inhomogeneous…