Asymmetric coupling between two quantum emitters

Downing, C. A.; Carreño, Juan Camilo López; Fernández‐Domínguez, Antonio I.; Valle, Elena del

doi:10.1103/physreva.102.013723

Cited by 15 publications

(12 citation statements)

References 100 publications

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“…Furthermore, the maximum chirality always achieves at φ = π/2 and φ = 3π/2 and is irrespective to the coupling strengths. Similar asymmetrical or even chiral coupling have been reported in other quantum systems, such as two circularly polarized QEs above the metal surface [27,28], the clockwise (CW) and counterclockwise (CCW) modes in a nonlinear whispering-gallery-mode (WGM) resonator [29], and the microwave circuit mediated magnon-photon coupling [30].…”

Section: Effective Atom-photon Interaction and Chiralitysupporting

confidence: 72%

Single-photon blockade in quasichiral atom–photon interaction: simultaneous high purity and high efficiency

Lu¹,

Liu²,

Li³

et al. 2022

New J. Phys.

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We investigate the single-photon blockade (1PB) in the quasichiral regime of atom-photon interaction, where the effective coupling between the cavity and the atom is bidirectional but asymmetrical, achieved by coupling to a dissipative environment. A synthetic magnetic current Φ is induced in the closed-loop coupling, which breaks down the reciprocity of atom-photon interaction and results in an asymmetrical or even unidirectional effective coupling between two selected quantum states. As an example, we couple the single-atom cavity-QED (cQED) system to a strongly dissipative plasmonic cavity. We find that in the quasichiral regime, the unconventional photon blockade (UPB) and the conventional photon blockade (CPB) realize simultaneously in the condition of maximum chirality (Φ = π/2 and 3π/2). As a result, 1PB in the quasichiral regime can combine the advantages of both UPB and CPB, demonstrating the perfect single-photon purity, higher efficiency, non-oscillating time dynamics as well as lower requirement of mode coupling to achieve UPB. Our work paves the way for single-photon blockade towards practical applications and reveals the intriguing quantum-optics phenomena in the quasichiral light-matter interaction.

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Section: Effective Atom-photon Interaction and Chiralitysupporting

confidence: 72%

Single-photon blockade in quasichiral atom–photon interaction: simultaneous high purity and high efficiency

Lu¹,

Liu²,

Li³

et al. 2022

New J. Phys.

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“…), the single-excitation eigenfrequencies are unaffected by the phase θ 12 . They simply read ω ± = ω 0 ± g, such that the energy ladder of the dimer is formed by {2ω 0 , ω + , ω − , 0} [36,65]. Moreover, a linear trimer (or indeed a linear chain of any size) will not support a gauge-independent phase, since it is crucial to have a ring geometry in order to mimic Aharonov-Bohm-style physics.…”

Section: (A) Hamiltonianmentioning

confidence: 99%

Non-reciprocal population dynamics in a quantum trimer

Downing

Zueco

2021

Proc. R. Soc. A.

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We study a quantum trimer of coupled two-level systems beyond the single-excitation sector, where the coherent coupling constants are ornamented by a complex phase. Accounting for losses and gain in an open quantum systems approach, we show how the mean populations of the states in the system crucially depend on the accumulated phase in the trimer. Namely, for non-trivial accumulated phases, the population dynamics and the steady states display remarkable non-reciprocal behaviour in both the singly and doubly excited manifolds. Furthermore, while the directionality of the resultant chiral current is primarily determined by the accumulated phase in the loop, the sign of the flow may also change depending on the coupling strength and the amount of gain in the system. This directionality paves the way for experimental studies of chiral currents at the nanoscale, where the phases of the complex hopping parameters are modulated by magnetic or synthetic magnetic fields.

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“…( 5) mapping onto the celebrated master equation of cascaded quantum systems: that of one-way coupling between a source and target, with strictly no back action 48,49 . The equivalence of master equations occurs when the following two conditions are fulfilled 70,71,73,75…”

Section: Cascaded Circulationmentioning

confidence: 99%

“…The interplay between the coherent and dissipative coupling can lead to the master equation of eq mapping onto the celebrated master equation of cascaded quantum systems: that of one-way coupling between a source and target, with strictly no back action. , The equivalence of master equations occurs when the following two conditions are fulfilled ,,, namely, both the strength condition of eq , and the phase condition of eq , must hold.…”

Section: Cascaded Circulationmentioning

confidence: 99%

Chiral Current Circulation and PT Symmetry in a Trimer of Oscillators

2020

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We present a simple quantum theory of a bosonic trimer in a triangular configuration, subject to gain and loss in an open quantum systems approach. Importantly, the coupling constants between each oscillator are augmented by complex arguments, which give rise to various asymmetries. In particular, one may tune the complex phases to induce chiral currents, including the special case of completely unidirectional (or one-way) circulation when certain conditions are met regarding the coherent and incoherent couplings. When our general theory is recast into a specific non-Hermitian Hamiltonian, we find interesting features in the trimer population dynamics close to the exceptional points between phases of broken and unbroken PT symmetry. Our theoretical work provides perspectives for the experimental realization of chiral transport at the nanoscale in a variety of accessible nanophotonic and nanoplasmonic systems, and paves the way for the potential actualization of nonreciprocal devices.

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Asymmetric coupling between two quantum emitters

Cited by 15 publications

References 100 publications

Single-photon blockade in quasichiral atom–photon interaction: simultaneous high purity and high efficiency

Single-photon blockade in quasichiral atom–photon interaction: simultaneous high purity and high efficiency

Non-reciprocal population dynamics in a quantum trimer

Chiral Current Circulation and PT Symmetry in a Trimer of Oscillators

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