Robust entanglement with three-dimensional nonreciprocal photonic topological insulators

Gangaraj, S. Ali Hassani; Hanson, George W.; Antezza, Mauro

doi:10.1103/physreva.95.063807

Cited by 43 publications

(23 citation statements)

References 49 publications

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“…An alternative approach that allows subradiant states to emerge for large ratios a/λ is changing the radiation field's boundary conditions by placing, e.g. a surface or a waveguide [33,[55][56][57][58][59][60][61][62] near the atoms, which in turn modifies the exchange interaction and dissipation. Another experimental challenge is the preparation of the subradiant wave packets.…”

Section: Discussionmentioning

confidence: 99%

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%

Subradiance-protected excitation transport

2019

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“…In this article, motivated by the recent interest in nonreciprocal photonic platforms with topological properties [29][30][31][32][33][34][35][36][37][38], we develop a theoretical formalism to characterize the Casimir-Polder force acting on an atom prepared in an arbitrary initial state in the vicinity of a arbitrary possibly bianisotropic, inhomogeneous and nonreciprocal dispersive system. In the general case, the optical force is written in terms of the system Green function.…”

Section: Introductionmentioning

confidence: 99%

Fluctuation-induced forces on an atom near a photonic topological material

et al. 2018

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We theoretically study the Casimir-Polder force on an atom in a arbitrary initial state in a rather general electromagnetic environment wherein the materials may have a nonreciprocal bianisotropic dispersive response. It is shown that under the Markov approximation the force has resonant and nonresonant contributions. We obtain explicit expressions for the optical force both in terms of the system Green function and of the electromagnetic modes. We apply the theory to the particular case wherein a two-level system interacts with a topological gyrotropic material, showing that the nonreciprocity enables exotic light-matter interactions and the opportunity to sculpt and tune the Casimir-Polder forces on the nanoscale. With a quasi-static approximation, we obtain a simple analytical expression for the optical force and unveil the crucial role of surface plasmons in fluctuation induced forces. Finally, we derive the Green function for a gyrotropic material half-space in terms of a Sommerfeld integral. *

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“…2). The ENZ waveguide does not suffer from this limitation and the emitters can be located anywhere inside the nanochannel, a property 19 that paves the way to efficient and long-range multi-qubit entanglement persisting over extended time periods and long distances.…”

Section: Passive Transient Entanglementmentioning

confidence: 99%

Resonance energy transfer and quantum entanglement mediated by epsilon-near-zero and other plasmonic waveguide systems

2019

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The entanglement and resonance energy transfer between two-level quantum emitters are typically limited to sub-wavelength distances due to the inherently short-range nature of the dipole-dipole interactions. Moreover, the entanglement of quantum systems is hard to preserve for a long time period due to decoherence and dephasing mainly caused by radiative and nonradiative losses. In this work, we outperform the aforementioned limitations by presenting efficient long-range inter-emitter entanglement and large enhancement of resonance energy transfer between two optical qubits mediated by epsilon-near-zero (ENZ) and other plasmonic waveguide types, such as V-shaped grooves and cylindrical nanorods. More importantly, we explicitly demonstrate that the ENZ waveguide resonant energy transfer and entanglement performance drastically outperforms the other waveguide systems. Only the excited ENZ mode has an infinite phase velocity combined with a strong and homogeneous electric field distribution, which leads to a giant energy transfer and efficient entanglement independent to the 2 emitters' separation distances and nanoscale positions in the ENZ nanowaveguide, an advantageous feature that can potentially accommodate multi-qubit entanglement. Moreover, the transient entanglement can be further improved and become almost independent of the detrimental decoherence effect when an optically active (gain) medium is embedded inside the ENZ waveguide. We also present that efficient steady-state entanglement can be achieved by using a coherent external pumping scheme. Finally, we report a practical way to detect the steady-state entanglement by computing the second-order correlation function. The presented findings stress the importance of plasmonic ENZ waveguides in the design of the envisioned onchip quantum communication and information processing plasmonic nanodevices. IntroductionOne of the main limitations of the current quantum photonic systems is the rapid loss of spatial and temporal coherence [1,2]. For instance, Förster resonance energy transfer [3], a well-known dipole-dipole interaction between quantum emitters important to light sources, biomedical imaging, and photovoltaic applications, is limited to subwavelength ranges [4,5]. In addition, quantum entanglement [6], which is significant for a variety of emerging applications in quantum communication and computing [7], usually takes place at extremely short distances and for very short time periods, due to the decoherence associated with unavoidable coupling between the system and the surrounding environment [8].During the last years, considerable research efforts have been dedicated to significantly improve coherence based on the emerging field of quantum plasmonic metamaterials [9,10]. These artificially engineered nanostructures can serve as a novel platform to trigger, harness, and enhance coherent light-matter interactions at the nanoscale [9,11]. For instance, long-range

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Robust entanglement with three-dimensional nonreciprocal photonic topological insulators

Cited by 43 publications

References 49 publications

Subradiance-protected excitation transport

Subradiance-protected excitation transport

Fluctuation-induced forces on an atom near a photonic topological material

Resonance energy transfer and quantum entanglement mediated by epsilon-near-zero and other plasmonic waveguide systems

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