Quantum superposition of three macroscopic states and superconducting qutrit detector
Abstract
Superconducting quantum coherent circuits have opened up a novel area of fundamental low-temperature science since they could potentially be the element base for future quantum computers. Here we report a quasi-three-level coherent system, the so-called superconducting qutrit, which has some advantages over a two-level information cell (qubit), and is based on the qutrit readout circuit intended to measure individually the states of each qubit in a quantum computer. The designed and implemented radio-frequency superconducting qutrit detector (rf SQUTRID) with atomic-size ScS-type contact utilizes the coherent-state superposition in the three-well potential with energy splitting Delta E_01/k_B=1.5 K at the 30th quantized energy level with good isolation from the electromagnetic environment. The reason why large values of Delta E_01 (and thus using atomic-size Nb-Nb contact) are required is to ensure an adiabatic limit for the quantum dynamics of magnetic flux in the rf SQUTRID.
Keywords
Cite
@article{arxiv.1111.6571,
title = {Quantum superposition of three macroscopic states and superconducting qutrit detector},
author = {V. I. Shnyrkov and A. A. Soroka and O. G. Turutanov},
journal= {arXiv preprint arXiv:1111.6571},
year = {2012}
}
Comments
9 pages, 5 figures, in v.3: text extended, inset in figure 1 (the device design) added