Two-Photon Rabi Splitting in a Coupled System of a Nanocavity and Exciton Complexes

Qian, Chenjiang; Wu, Shaojie; Song, Feilong; Peng, Kai; Xie, Xin; Yang, Jie; Xiao, Shan; Steer, Matthew J.; Thayne, Iain; Tang, Chengchun; Zuo, Zhentao; Jin, Kuijuan; Gu, Changzhi; Xu, Xiulai

doi:10.1103/physrevlett.120.213901

Cited by 64 publications

(40 citation statements)

References 44 publications

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“…4(c)) is in good agreement with results in the weak coupling regime (dark solid line) as expected. The maximum g at B z = 3.5 T is 210 µeV (Rabi splitting of 420 µeV), much larger than the value achieved in s-shell-cavity system with analogous QDs [43], and is also the largest value achieved in cavity-dot system so far [44]. Additionally, the maximum g rapidly decays to an unobservable value with a small additional B = 0.5 T (Fig.…”

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confidence: 80%

Enhanced Strong Interaction between Nanocavities and p -shell Excitons Beyond the Dipole Approximation

et al. 2019

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Large coupling strengths in exciton-photon interactions are important for quantum photonic network, while strong cavity-quantum-dot interactions have been focused on s-shell excitons with small coupling strengths. Here we demonstrate strong interactions between cavities and p-shell excitons with a great enhancement by the in situ wave-function control. The p-shell excitons are demonstrated with much larger wave-function extents and nonlocal interactions beyond the dipole approximation. Then the interaction is tuned from the nonlocal to local regime by the wave-function shrinking, during which the enhancement is obtained. A large coupling strength of 210 µeV has been achieved, indicating the great potential of p-shell excitons for coherent information exchange. Furthermore, we propose a distributed delay model to quantitatively explain the coupling strength variation, revealing the intertwining of excitons and photons beyond the dipole approximation.

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confidence: 80%

Enhanced Strong Interaction between Nanocavities and p -shell Excitons Beyond the Dipole Approximation

et al. 2019

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“…and has been realized in many different experimental systems for a wide range of coupling strengths [16][17][18][19][20][21][22][23][24][25][26] . Unlike the one-photon counterpart, the two-photon generalization exhibits a particular feature, commonly known as the spectral collapse, which occurs when the coupling strength ǫ goes beyond a critical value ǫ c ≡ ω/2 .…”

Section: Demystifying the Spectral Collapse In Two-photon Rabi Model mentioning

confidence: 99%

Demystifying the spectral collapse in two-photon Rabi model

2020

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We have investigated the eigenenergy spectrum of the two-photon Rabi model at the critical coupling, particularly the special feature “spectral collapse”, by means of an elementary quantum mechanics approach. The eigenenergy spectrum is found to consist of both a set of discrete energy levels and a continuous energy spectrum. Each of these eigenenergies has a two-fold degeneracy corresponding to the spin degree of freedom. The discrete eigenenergy spectrum has a one-to-one mapping with that of a particle in a “Lorentzian function” potential well, and the continuous energy spectrum can be derived from the scattering problem associated with a potential barrier. The number of bound states available at the critical coupling is determined by the energy difference between the two atomic levels so that the extent of the “spectral collapse” can be monitored in a straightforward manner.

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“…When the energy gap of the two-photon resonance is larger than the cavity decay rate, a first photon generated in the cavity will block the transmission of a second photon [33]. This mechanism relying on strong energy-spectrum anharmonicity, * dengyg3@mail.sysu.edu.cn † lichaoh2@mail.sysu.edu.cn is referred to as conventional PB, and remains a great challenge, despite some experimental advances in realizing strong coupling in a high-finesse cavity [36][37][38][39][40][41][42][43][44]. In contrast to conventional PB, unconventional PB has led to tremendous advances in achieving strong antibunching of photons by using quantum interference [45][46][47][48][49][50][51][52][53], in which the basic principle is based on constructive interference between different quantum transition paths from the ground state to a two-photon excitation state.…”

Section: Introductionmentioning

confidence: 99%

Strong Photon Blockade Mediated by Optical Stark Shift in a Single-Atom–Cavity System

2019

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We propose a theoretical scheme to achieve strong photon blockade via a single atom in cavity. By utilizing optical Stark shift, the dressed-state splitting between higher and lower branches is enhanced, which results in significant increasing for lower (higher) branch and decreasing for higher (lower) branch at the negative (positive) Stark shift, and dominates the time-evolution of photon number oscillations as well. Furthermore, the two-photon excitation is suppressed via quantum interference under optimal phase and Rabi frequency of an external microwave field. It is shown that the interplay between the quantum interference and the enhanced vacuum-Rabi splitting gives rise to a strong photon blockade for realizing high-quality single photon source beyond strong atomcavity coupling regime. In particular, by tuning the optical Stark shift, the second-order correlation function for our scheme has three orders of magnitude smaller than Jaynes-Cummings model and correspondingly there appears a large cavity photon number as well. Our proposal may implicate exciting opportunities for potential applications on quantum network and quantum information processing.

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Two-Photon Rabi Splitting in a Coupled System of a Nanocavity and Exciton Complexes

Cited by 64 publications

References 44 publications

Enhanced Strong Interaction between Nanocavities and p -shell Excitons Beyond the Dipole Approximation

Enhanced Strong Interaction between Nanocavities and p -shell Excitons Beyond the Dipole Approximation

Demystifying the spectral collapse in two-photon Rabi model

Strong Photon Blockade Mediated by Optical Stark Shift in a Single-Atom–Cavity System

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