Coherent destruction of tunneling in two-level system driven across avoided crossing via photon statistics.

Qiang Miao,Yujun Zheng

doi:10.1038/srep28959

Abstract

In this paper, the nature of the multi-order resonance and coherent destruction of tunneling (CDT) for two-level system driven cross avoided crossing is investigated by employing the emitted photons 〈N〉 and the Mandel’s Q parameter based on the photon counting statistics. An asymmetric feature of CDT is shown in the spectrum of Mandel’s Q parameter. Also, the CDT can be employed to suppress the spontaneous decay and prolong waiting time noticeably. The photon emission pattern is of monotonicity in strong relaxation, and homogeneity in pure dephasing regime, respectively.

Highlights

In this paper, the nature of the multi-order resonance and coherent destruction of tunneling (CDT) for two-level system driven cross avoided crossing is investigated by employing the emitted photons 〈N〉 and the Mandel’s Q parameter based on the photon counting statistics
By employing the photon counting statistics of generating function technique[27,28,29,30], in this paper, we investigate the representation of CDT via photon emission from Two-level system (TLS), and test the new physics beyond the approximation methods mentioned above
Based on the theoretical framework above, we explore the different dynamical properties of the resonance and CDT influences in weak relaxation regime by the three expressions of Eqs 1, 8 and 9 for the TLS system

Summary

Introduction

The nature of the multi-order resonance and coherent destruction of tunneling (CDT) for two-level system driven cross avoided crossing is investigated by employing the emitted photons 〈N〉 and the Mandel’s Q parameter based on the photon counting statistics. To present the dynamical behaviors of the CDT for TLS and corresponding properties via emitted photons, in this paper, we employ the theoretical framework of photon counting statistics by generating function. The fast driving-induced oscillation in population ρe is observed in the exact results, while it has been averaged by the effective Hamiltonian of GVV and RWA approximations.

Results

Conclusion