Coherent spin manipulation in an exchange-only qubit

Autor:	Laird, E. A., Taylor, J. M., DiVincenzo, D. P., Marcus, C. M., Hanson, M. P., Gossard, A. C.
Rok vydání:	2010
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Quantum Physics
Zdroj:	Phys. Rev. B 82 075403 (2010)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.82.075403
Popis:	Initialization, manipulation, and measurement of a three-spin qubit are demonstrated using a few-electron triple quantum dot, where all operations can be driven by tuning the nearest-neighbor exchange interaction. Multiplexed reflectometry, applied to two nearby charge sensors, allows for qubit readout. Decoherence is found to be consistent with predictions based on gate voltage noise with a uniform power spectrum. The theory of the exchange-only qubit is developed and it is shown that initialization of only two spins suffices for operation. Requirements for full multi-qubit control using only exchange and electrostatic interactions are outlined. Comment: related work at http://marcuslab.harvard.edu
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1005.0273 Zobrazit plný text záznamu View this record from Arxiv