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arXiv:1402.7140 · Nature Nanotechnology

Storing quantum information for 30 seconds in a nanoelectronic device

Juha T. Muhonen, Juan Pablo Dehollain, Arne Laucht, Fay E. Hudson, Rachpon Kalra, T. Sekiguchi, Kohei M. Itoh, David N. Jamieson, Jeffrey Colin McCallum, Andrew S. Dzurak, Andrea Morello

Published Oct 10, 2014• 663 citations
arXivHTMLPDF
DOI
10.1038/nnano.2014.211

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The behavior of light in nano/micro optical devices has shown promising results which can be useful for much fundamental and applied research, especially in nanoelectronics. In particular, with the manipulation of fast and slow light, Pornsuwancharoen and Yupapin [1] have proposed the use of a simple device called a microring resonator to perform such behavior, in which the four different behaviors of light, that is, fast, slow, stopping, and storing of light are investigated using a ring resonator. Nowadays, stopping or cooling a light beam has become a promising technique for atom/molecule trapping investigations (using static or dynamic tweezers), especially after the announcement of the 2012 Nobel Prize in Physics for the whispering gallery modes [2,3]. There are two more kinds of devices that are used to trap light beams: the use of microcavity arrays performed by Yanik and Fan [4], and the nonlinear microring resonator by Yupapin and Pornsuwancharoen [5] for stopping light (laser beam). Ang and Ngo have also recently done experiments in slowing light in microresonators using a microring system [6]. This concept is a concrete backbone for many applications.
Quantum characteristics of a driven series RLC nanoelectronic circuit whose capacitance varies with time are studied using an invariant operator method together with a unitary transformation approach. In particular, squeezing effects and nonclassical properties of a superposition state composed of two displaced squeezed number states of equal amplitude, but 180° out of phase, are investigated in detail. We applied our developments to a solvable specific case obtained from a suitable choice of time-dependent parameters. The pattern of mechanical oscillation of the amount of charges stored in the capacitor, which are initially displaced, has exhibited more or less distortion due to the influence of the time-varying parameters of the system. We have analyzed squeezing effects of the system from diverse different angles and such effects are illustrated for better understanding. It has been confirmed that the degree of squeezing is not constant, but varies with time depending on specific situations. We have found that quantum interference occurs whenever the two components of the superposition meet together during the time evolution of the probability density. This outcome signifies the appearance of nonclassical features of the system. Nonclassicality of dynamical systems can be a potential resource necessary for realizing quantum information technique. Indeed, such nonclassical features of superposition states are expected to play a key role in upcoming information science which has attracted renewed attention recently.