Zobrazeno 1 - 10
of 983
pro vyhledávání: '"SARMA, S. DAS"'
Hole spin qubits in Ge, investigated for all-electrical spin manipulation because of its large spin-orbit coupling, are exposed to charge noise leading to decoherence. Here we construct a model of $1/f$ noise from individual fluctuators and determine
Externí odkaz:
http://arxiv.org/abs/2408.10302
Autor:
Throckmorton, Robert E., Sarma, S. Das
Publikováno v:
Phys. Rev. B 109, 075304 (2024)
The work of Ahn derives the noise power spectrum of a two-level fluctuator (TLF) in the case that it interacts only with a subregion of a full electron bath and thus is subject to a fluctuating temperature. However, Eq.~(1), which gives the variance
Externí odkaz:
http://arxiv.org/abs/2305.14348
Autor:
Throckmorton, Robert E., Sarma, S. Das
Publikováno v:
Phys. Rev. B 106, 245419 (2022)
We consider the effects of leakage on the ability to realize a discrete time crystal (DTC) in a semiconductor quantum dot linear array being operated as a chain of singlet-triplet (ST) qubits. This system realizes an Ising model with an effective app
Externí odkaz:
http://arxiv.org/abs/2209.15008
Publikováno v:
Phys. Rev. B 107, 035129 (2023)
We study many-body localization (MBL) in the quasiperiodic $t_1$-$t_2$ model, focusing on the role of next-nearest-neighbor (NNN) hopping $t_2$, which introduces a single-particle mobility edge. The calculated phase diagram can be divided into three
Externí odkaz:
http://arxiv.org/abs/2205.15339
Autor:
Throckmorton, Robert E., Sarma, S. Das
Publikováno v:
Phys. Rev. B 105, 245413 (2022)
We determine the interqubit crosstalk- and charge-noise-induced decoherence time $T_2^\ast$ for a system of $L$ exchange-coupled electronic spin qubits in arrays of size $L=3$--$14$ for a number of different multiqubit geometries by directly calculat
Externí odkaz:
http://arxiv.org/abs/2112.08358
Publikováno v:
Physical Review B. 105, 155411 (2022)
We examine how dissipation and gate timing errors affect the fidelity of a sequence of SWAP gates on a chain of interacting qubits in comparison to noise in the interqubit interaction. Although interqubit interaction noise and gate timing errors are
Externí odkaz:
http://arxiv.org/abs/2110.11329
Publikováno v:
Phys. Rev. Lett. 128, 146601 (2022)
We study many-body localization (MBL) for interacting one-dimensional lattice fermions in random (Anderson) and quasiperiodic (Aubry-Andre) models, focusing on the role of interaction range. We obtain the MBL quantum phase diagrams by calculating the
Externí odkaz:
http://arxiv.org/abs/2109.04489
Publikováno v:
Phys. Rev. B 104, 195134 (2021)
Recent experiments have observed correlated insulating and possible superconducting phases in twisted homobilayer transition metal dichalcogenides (TMDs). Besides the spin-valley locked moire bands due to the intrinsic Ising spin-orbit coupling, homo
Externí odkaz:
http://arxiv.org/abs/2105.02415
Autor:
Ahn, Seongjin, Sarma, S. Das
Publikováno v:
Phys. Rev. B 103, 165303 (2021)
We investigate the effect of the mass anisotropy on Friedel Oscillations, Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, screening properties, and Boltzmann transport in two dimensional (2D) metallic and doped semiconductor systems. We calculate t
Externí odkaz:
http://arxiv.org/abs/2102.05659
Autor:
Zhang, Hao, de Moor, Michiel W. A., Bommer, Jouri D. S., Xu, Di, Wang, Guanzhong, van Loo, Nick, Liu, Chun-Xiao, Gazibegovic, Sasa, Logan, John A., Car, Diana, Veld, Roy L. M. Op het, van Veldhoven, Petrus J., Koelling, Sebastian, Verheijen, Marcel A., Pendharkar, Mihir, Pennachio, Daniel J., Shojaei, Borzoyeh, Lee, Joon Sue, Palmstrøm, Chris J., Bakkers, Erik P. A. M., Sarma, S. Das, Kouwenhoven, Leo P.
We report electron transport studies on InSb-Al hybrid semiconductor-superconductor nanowire devices. Tunnelling spectroscopy is used to measure the evolution of subgap states while varying magnetic field and voltages applied to various nearby gates.
Externí odkaz:
http://arxiv.org/abs/2101.11456