Scalable qubit architecture based on holes in quantum dot molecules
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Scalable qubit architecture based on holes in quantum dot moleculesAutoria
Data de publicació
2012Editor
American Physical SocietyISSN
1098-0121; 1550-235XTipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://prb.aps.org/abstract/PRB/v86/i8/e085319Versió
info:eu-repo/semantics/publishedVersionResum
Spins confined in quantum dots are a leading candidate for solid-state quantum bits that can be coherently
controlled by optical pulses. There are, however, many challenges to developing a scalable multibit informa ... [+]
Spins confined in quantum dots are a leading candidate for solid-state quantum bits that can be coherently
controlled by optical pulses. There are, however, many challenges to developing a scalable multibit information
processing device based on spins in quantum dots, including the natural inhomogeneous distribution of quantum
dot energy levels, the difficulty of creating all-optical spin manipulation protocols compatible with nondestructive
readout, and the substantial electron-nuclear hyperfine interaction-induced decoherence. Here, we present a
scalable qubit design and device architecture based on the spin states of single holes confined in a quantum dot
molecule. The quantum dot molecule qubit enables a new strategy for optical coherent control with dramatically
enhanced wavelength tunability. The use of hole spins allows the suppression of decoherence via hyperfine
interactions and enables coherent spin rotations using Raman transitions mediated by a hole-spin-mixed optically
excited state. Because the spin mixing is present only in the optically excited state, dephasing and decoherence
are strongly suppressed in the ground states that define the qubits and nondestructive readout is possible. We
present the qubit and device designs and analyze the wavelength tunability and fidelity of gate operations that can
be implemented using this strategy. We then present experimental and theoretical progress toward implementing
this design. [-]
Publicat a
Physical review B, Volume 86, Issue 8, AugustDrets d'accés
©2012 American Physical Society
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