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복잡계 이론물리 연구단
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Time molecules with periodically driven interacting qubits

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Title
Time molecules with periodically driven interacting qubits
Author(s)
Shulga, K., V; Ihor Vakulchyk; Nakamura, Y.; Sergej Flach; Mikhail Fistul
Publication Date
2021-07
Journal
QUANTUM SCIENCE AND TECHNOLOGY, v.6, no.3
Publisher
IOP PUBLISHING LTD
Abstract
We provide numerical evidence for a temporal quantum-mechanical interference phenomenon: time molecules (TMs). A variety of such stroboscopic states are observed in the dynamics of two interacting qubits subject to a periodic sequence of pi-pulses with the period T. The TMs appear periodically in time and have a large duration, delta t (TM) T. All TMs are characterized by almost zero value of the total polarization and a strong enhancement of the entanglement entropy S up to the maximum value of S ln 2 indicating the presence of corresponding Bell state. Moreover, the TMs demonstrate a stroboscopic switching between the two maximally entangled Bell states and a slow leakage into other eigenstates. The TMs are generated by the commensurability of the Floquet eigenvalues and the presence of maximally entangled Floquet eigenstates. The TMs remain stable with detuned system parameters and with an increased number of qubits. In particular, we observed the TMs in the dynamics of three interacting qubits, and these TMs show a stroboscopic switching between the four Greenberger-Horne-Zeilinger states. The TMs can be observed in microwave experiments with an array of superconducting qubits.
URI
https://pr.ibs.re.kr/handle/8788114/10111
DOI
10.1088/2058-9565/abffbc
ISSN
2058-9565
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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