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Theory of dynamic nuclear polarization and feedback in quantum dots
Sophia E. Economou, Edwin Barnes
An electron confined in a quantum dot interacts with its local nuclear spin environment through the hyperfine contact interaction. This interaction combined with external control a…
Robust quantum gates for singlet-triplet spin qubits using composite pulses
Xin Wang, Lev S. Bishop, Edwin Barnes +2
We present a comprehensive theoretical treatment of SUPCODE, a method for generating dynamically corrected quantum gate operations, which are immune to random noise in the environm…
Strong Hyperfine-Induced Modulation of an Optically-Driven Hole Spin in an InAs Quantum Dot
Samuel G. Carter, Sophia E. Economou, Alex Greilich +4
Compared to electrons, holes in InAs quantum dots have a significantly weaker hyperfine interaction that leads to less dephasing from nuclear spins. Thus many recent studies have s…
Exact Classification of Landau-Majorana-Stückelberg-Zener Resonances By Floquet Determinants
Sriram Ganeshan, Edwin Barnes, S. Das Sarma
Recent experiments have shown that Landau-Majorana-Stuckelberg-Zener (LMSZ) interferometry is a powerful tool for demonstrating and exploiting quantum coherence not only in atomic…
Six-electron semiconductor double quantum dot qubits
Erik Nielsen, Edwin Barnes, J. P. Kestner +1
We consider a double-quantum-dot (DQD) qubit which contains six electrons instead of the usual one or two. In this spin qubit, quantum information is encoded in a low-lying singlet…
Noise-resistant control for a spin qubit array
J. P. Kestner, Xin Wang, Lev S. Bishop +2
We develop a systematic method of performing corrected gate operations on an array of exchange-coupled singlet-triplet qubits in the presence of both fluctuating nuclear Overhauser…