Encoding quantum bits in bound electronic states of a graphene nanotorus

Abstract

We propose to use the quantum states of an electron trapped on the inner surface of a graphene nanotorus to realize as a new kind of physical quantum bit, which can be used to encode quantum information. Fundamental tasks for quantum information processing, such as the qubit initialization and the implementation of arbitrary single qubit gates, can be performed using external magnetic and electric fields. We also analyze the robustness of the device again systematic errors, which can be suppressed by a suitable choice of the external control fields. These findings open new prospects for the development an alternative platform for quantum computing, for which the scalability remains to be determined.

Time-dependent transport in graphene Mach-Zender interferometers

“…LL splitting also allows to observe many kinds of collective excitations, such as magnons [13][14][15], valley skyrmions [16], and even strain-induced pseudomagnetoexcitons [17]. For these reasons, graphene has recently raised much attention in the field of electronic quantum optics [18][19][20][21][22][23][24][25][26] in the integer and fractional quantum Hall regimes [20], and offers promising perspectives for quantum computation as well [27]. The degeneracy lifting of LLs implies the presence of a gap between the conduction and valence bands of graphene, which is in general present in experimental conditions, although specific production techniques such as encapsulation with hexagonal boron nitride (hBN) [28,29] are able to produce high-purity graphene samples with essentially no gap.…”