Quantum superposition of three macroscopic states and superconducting qutrit detector

V. I. Shnyrkov; A. A. Soroka; O. G. Turutanov

doi:10.1103/PhysRevB.85.224512

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Quantum superposition of three macroscopic states and superconducting qutrit detector

V. I. Shnyrkov, A. A. Soroka, O. G. Turutanov

DOI 10.1103/PhysRevB.85.224512 · Physical Review B

T1

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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 ΔE01/kB≈1.5K at the 30th quantized energy level with good isolation from the electromagnetic environment. The reason why large values of ΔE01 (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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown