Directional subradiance from helical-phase-imprinted multiphoton states

Jen, H. H.

doi:10.1038/s41598-018-25592-5

Cited by 12 publications

(14 citation statements)

References 48 publications

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“…A future direction connecting to this work will be to move away from the linear optics regime (single excitation sector of the dynamics) [33,35,37,38,68] and consider situations where two or more wave packets interfere with each other effectively realizing photon-photon interactions in a subradiant decoherence-free manifold. Such platforms can find applications ranging from the creation of non-classical states of light to the realization of photon-photon quantum gates [69,70].…”

Section: Discussionmentioning

confidence: 99%

“…First, we focus on a ring lattice, as illustrated in figure 1(a) [35][36][37]. Here, the matricesV and Ḡ are symmetric circulant due to the periodic boundary conditions such that, for each orientation of the transition dipole m, the simultaneous eigenstates for both matrices are given by the plane waves…”

Section: Subradiant Transport On a Ring Latticementioning

confidence: 99%

“…Super-and subradiance have been observed experimentally not only in atomic gases, but also in QED circuits [22,23], metamaterial arrays [24], and quantum dots [25][26][27]. This collective atom-light coupling has found a variety of applications such as storage of light via the preparation of subradiant states through phase-imprinting protocols [28][29][30][31][32][33][34][35][36][37][38], topologically protected transport of excitations [39,40], or efficient long-range energy transport [41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

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Subradiance-protected excitation transport

2019

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We explore excitation transport within a one-dimensional chain of atoms where the atomic transition dipoles are coupled to the free radiation field. When the atoms are separated by distances smaller or comparable to the wavelength of the transition, the exchange of virtual photons leads to the transport of the excitation through the lattice. Even though this is a strongly dissipative system, we find that the transport is subradiant, that is, the excitation lifetime is orders of magnitude longer than the one of an individual atom. In particular, we show that a subspace of the spectrum is formed by subradiant states with a linear dispersion relation, which allows for the dispersionless transport of wave packets over long distances with virtually zero decay rate. Moreover, the group velocity and direction of the transport can be controlled via an external uniform magnetic field while preserving its subradiant character. The simplicity and versatility of this system, together with the robustness of subradiance against disorder, makes it relevant for a range of applications such as lossless energy transport and long-time light storage.

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Section: Discussionmentioning

confidence: 99%

Section: Subradiant Transport On a Ring Latticementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Subradiance-protected excitation transport

2019

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“…A number of proposals on how this could be achieved have been brought forward in recent studies. The suggested schemes involve among others a magnetic field gradient [31] or light that imprints the phases due to a polarization gradient [15,38]. The reason for these extensive studies of preparation schemes is that large phase differences cause the emit- ter dipole fields to interfere destructively [see Fig.…”

Section: Free Space Collective Dynamics: Super-and Subradiant Statesmentioning

confidence: 99%

Enhanced collective Purcell effect of coupled quantum emitter systems

et al. 2019

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Cavity-embedded quantum emitters show strong modifications of free space radiation properties such as an enhanced decay known as the Purcell effect. The central parameter is the cooperativity C, the ratio of the square of the coherent cavity coupling strength over the product of cavity and emitter decay rates. For a single emitter, C is independent of the transition dipole moment and dictated by geometric cavity properties such as finesse and mode waist. In a recent work [Phys. Rev. Lett. 119, 093601 (2017)] we have shown that collective excitations in ensembles of dipole-dipole coupled quantum emitters show a disentanglement between the coherent coupling to the cavity mode and spontaneous free space decay. This leads to a strong enhancement of the cavity cooperativity around certain collective subradiant antiresonances. Here, we present a quantum Langevin equations approach aimed at providing results beyond the classical coupled dipoles model. We show that the subradiantly enhanced cooperativity imprints its effects onto the cavity output field quantum correlations while also strongly increasing the cavity-emitter system's collective Kerr nonlinear effect.

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“…In this regime, strongly-coupled RDDI show up since light can rescatter multiple times before leaving the whole medium. RDDI in a three-dimensional (3D) reservoir are responsible for the collective phenomena of superradiance [12][13][14][27][28][29][30][31][32][33][34][35][36] and subradiance [37][38][39][40][41][42][43][44][45][46][47][48][49] in a dense atomic system. RDDI in a 3D reservoir in general are reciprocal couplings which preserve the time-reversal symmetry, and in the long range behave asymptotically as the inverse of mutual atomic separation (see appendix A).…”

Section: Effective Chiral-coupled Interactionsmentioning

confidence: 99%

Selective transport of atomic excitations in a driven chiral-coupled atomic chain

Jen¹

2019

J. Phys. B: At. Mol. Opt. Phys.

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We theoretically investigate the flow of the atomic excitations in a driven chiral-coupled atomic chain with nonreciprocal decay channels. This onedimensional system allows infinite-range dipole-dipole interaction, and enables directional guided modes of scattered light. Under a weakly driven condition, we are able to simulate the transport properties of atomic excitations between the left and right parts of the chain. In the steady states, the transport is highly dependent on the equidistant positions of the ordered array, the excitation field detunings, and the directionality of such chiral-coupled system. We discuss the parameter regimes which are resilient or sensitive to position fluctuations, and provide insights to precise and genuine state preparations. Furthermore, we study the effect of position fluctuations on the transport of excitations. Our results can shed light on deterministic state preparations and pave the way for many-body state manipulations in the driven and dissipative chiral-coupled systems.

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Directional subradiance from helical-phase-imprinted multiphoton states

Cited by 12 publications

References 48 publications

Subradiance-protected excitation transport

Subradiance-protected excitation transport

Enhanced collective Purcell effect of coupled quantum emitter systems

Selective transport of atomic excitations in a driven chiral-coupled atomic chain

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