94 citations · 533 across the 23 of their papers we have counts for
23 papers
A generalized model of the noise spectrum of a two-level fluctuator in the presence of an electron subbath
Robert E. Throckmorton, S. Das Sarma
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…
Effects of leakage on the realization of a discrete time crystal in a chain of singlet-triplet qubits
Robert E. Throckmorton, S. Das Sarma
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…
Crosstalk- and charge-noise-induced multiqubit decoherence in exchange-coupled quantum dot spin qubit arrays
Robert E. Throckmorton, S. Das Sarma
We determine the interqubit crosstalk- and charge-noise-induced decoherence time for a system of exchange-coupled electronic spin qubits in arrays of size --$14…
Dissipation and gate timing errors in SWAP operations of qubits
Nathan L. Foulk, Robert E. Throckmorton, S. Das Sarma
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 interact…
Studying many-body localization in exchange-coupled electron spin qubits using spin-spin correlations
Robert E. Throckmorton, S. Das Sarma
We show that many-body localization (MBL) effects can be observed in a finite chain of exchange-coupled spin qubits in the presence of both exchange and magnetic noise, a system th…
Fidelity of a sequence of SWAP operations on a spin chain
Robert E. Throckmorton, S. Das Sarma
We consider the ``transport'' of the state of a spin across a Heisenberg-coupled spin chain via the use of repeated SWAP gates, starting with one of two states---one in which the l…
Spontaneous symmetry breaking in a honeycomb lattice subject to a periodic potential
Robert E. Throckmorton, S. Das Sarma
Motivated by recent developments in twisted bilayer graphene moiré superlattices, we investigate the effects of electron-electron interactions in a honeycomb lattice with an applie…
Conditions allowing error correction in driven qubits
Robert E. Throckmorton, S. Das Sarma
We consider a qubit that is driven along its logical axis, with noise along the axis in the driving field proportional to some function , as well as noise along t…
Plasmon-pole approximation for many-body-effects in extrinsic graphene
E. H. Hwang, Robert E. Throckmorton, S. Das Sarma
We develop the plasmon-pole approximation (PPA) theory for calculating the carrier self-energy of extrinsic graphene as a function of doping density within analytical approximation…
Failure of Kohn's theorem and the apparent failure of the -sum rule in intrinsic Dirac-Weyl materials in the presence of a filled Fermi sea
Robert E. Throckmorton, S. Das Sarma
Kohn's theorem and the -sum rule are powerful theorems, the first applying to translationally invariant single-band electronic systems with parabolic electronic dispersion relat…
Error correction for gate operations in systems of exchange-coupled singlet-triplet qubits in double quantum dots
Donovan Buterakos, Robert E. Throckmorton, S. Das Sarma
We present a scheme for correcting for crosstalk- and noise-induced errors in exchange-coupled singlet-triplet semiconductor double quantum dot qubits. While exchange coupling allo…
Crosstalk error correction through dynamical decoupling of single-qubit gates in capacitively coupled singlet-triplet semiconductor spin qubits
Donovan Buterakos, Robert E. Throckmorton, S. Das Sarma
In addition to magnetic field and electric charge noise adversely affecting spin qubit operations, performing single-qubit gates on one of multiple coupled singlet-triplet qubits p…
Fast pulse sequences for dynamically corrected gates in single-triplet qubits
Robert E. Throckmorton, Chengxian Zhang, Xu-Chen Yang +3
We present a set of experimentally feasible pulse sequences that implement any single-qubit gate on a singlet-triplet spin qubit and demonstrate that these new sequences are up to…
Randomized benchmarking of barrier versus tilt control of a singlet-triplet qubit
Chengxian Zhang, Robert E. Throckmorton, Xu-Chen Yang +3
Decoherence due to charge noise is one of the central challenges in using spin qubits in semiconductor quantum dots as a platform for quantum information processing. Recently, it h…
Environmental noise effects on entanglement fidelity of exchange-coupled semiconductor spin qubits
Robert E. Throckmorton, Edwin Barnes, S. Das Sarma
We investigate the effect of magnetic field and charge noise on the generation of entanglement between two Heisenberg exchange-coupled electron spins in a double quantum dot. We fo…
Dynamics of two coupled semiconductor spin qubits in a noisy environment
S. Das Sarma, Robert E. Throckmorton, Yang-Le Wu
We theoretically consider the temporal dynamics of two coupled spin qubits (e.g., semiconductor quantum dots) driven by the inter-qubit spin-spin coupling. The presence of environm…
Noise-induced collective quantum state preservation in spin qubit arrays
Edwin Barnes, Dong-Ling Deng, Robert E. Throckmorton +2
The hyperfine interaction with nuclear spins (or, Overhauser noise) has long been viewed as a leading source of decoherence in individual quantum dot spin qubits. Here we show that…
Many-body effects and ultraviolet renormalization in three-dimensional Dirac materials
Robert E. Throckmorton, Johannes Hofmann, Edwin Barnes +1
We develop a theory for electron-electron interaction-induced many-body effects in three dimensional (3D) Weyl or Dirac semimetals, including interaction corrections to the polariz…
Quantum multicriticality of bilayer graphene in the presence of a tunable energy gap
Robert E. Throckmorton, S. Das Sarma
We develop a theory for quantum phases and quantum multicriticality in bilayer graphene in the presence of an explicit energy gap in the non-interacting spectrum by extending previ…
Effective field theory, three-loop perturbative expansion, and their experimental implications in graphene many-body effects
Edwin Barnes, E. H. Hwang, R. E. Throckmorton +1
Many-body electron-electron interaction effects are theoretically considered in monolayer graphene from a continuum effective field-theoretic perspective by going beyond the standa…
Electronic multicriticality in bilayer graphene
Vladimir Cvetkovic, Robert E. Throckmorton, Oskar Vafek
We map out the possible ordered states in bilayer graphene at the neutrality point by extending the previous renormalization group treatment of many-body instabilities to finite te…
Fermions on bilayer graphene: symmetry breaking for B=0 and nu=0
Robert E. Throckmorton, Oskar Vafek
We extend previous analyses of fermions on a honeycomb bilayer lattice via weak-coupling renormalization group (RG) methods with extremely short-range and extremely long-range inte…
Relaxation of Nuclear Magnetic Moments and Site-Selective NMR in d-Wave Superconductors
Robert E. Throckmorton, Oskar Vafek
A new mechanism for relaxing the nuclear magnetic moments, in which a pair of spin-polarized BCS quasiparticles is emitted or absorbed, and which dominates at low temperature, is i…