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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Quantum networking with quantum dots coupled to micro-cavities

Edo Waks A, Deepak Sridharan, Jelena Vuckovic A

Published Sep 9, 2007• 0 citations
Publisher

Abstract

We describe an effect called Dipole Induced Transparency which enables a dipole emitter to strongly modify the cavity spectrum, even in the weak coupling regime. We then describe a method for generating entanglement and performing a full Bell measurement between two QDs using Dipole Induced Transparency. Finally, we show how DIT enables entanglement between QDs with vastly different radiative properties. The proposal is shown to be robust to cavity resonance mismatch.

DOI
10.1117/12.732259

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We describe an effect called Dipole Induced Transparency which enables a dipole emitter to strongly modify the cavity spectrum, even in the weak coupling regime. We then describe a method for generating entanglement and performing a full Bell measurement between two QDs using Dipole Induced Transparency. Finally, we show how DIT enables entanglement between QDs with vastly different radiative properties. The proposal is shown to be robust to cavity resonance mismatch.
We describe a method for generating entanglement between two spatially separated dipoles coupled to optical microcavities. The protocol works even when the dipoles have different resonant frequencies and radiative lifetimes. This method is particularly important for solid-state emitters, such as quantum dots, which suffer from large inhomogeneous broadening. We show that high fidelities can be obtained over a large dipole detuning range without significant loss of efficiency. We analyze the impact of higher-order photon number states and cavity resonance mismatch on the performance of the protocol.
We propose a feasible scheme of generating multipartite entanglement with the dipole induced transparency (DIT) effect in indirectly coupled dipole-microcavity systems. It is shown that the transmission spectrum is closely related with the interference of dipole-microcavity systems, and we can generate different classes of multipartite entanglement, e.g., the Greenberger–Horne–Zeilinger state, the W state, and the Dicke state, of the dipole emitters just by choosing an appropriate frequency of the incident photon. Benefiting from the DIT effect, the schemes may work in the bad or low-Q cavity regime only if the large Purcell factor of the dipole-microcavity system is fulfilled, and they are also insensitive to experimental noise, which may be feasible with present accessible technology.
Dipole-induced transparency (DIT) is one of the most well-known transparency effects in quantum optics and has wide applications in scalable quantum information processing and quantum computation. However, most of the existing literatures only focuses on the DIT effect with coherent dipole-cavity coupling, thus its universality in other types of coupling is still to be clarified. Here, we propose a feasible scheme to realize dissipative dipole-cavity coupling with the assistance of a highly dissipative microcavity, and explicitly exhibit cavity-mode attraction. We then investigate the DIT effect in a cavity-waveguide system with attractive cavity modes and find that it can still be achievable even though the probe light is resonant with two attractive cavity modes. Furthermore, we reveal its underlying transparency mechanism with eigenfrequencies and the effective susceptibility of the dipole-cavity system, and show that its transparency lies in the destructive interference of two attractive cavity modes with splitting damping rates instead of splitting resonance frequencies in coherent coupling. Moreover, we find that the attractive and repulsive phenomena of the effective susceptibility, which also plays an important role in the DIT effect, exist in the dipole-cavity system. Our findings may not only be of importance for gaining a more comprehensive understanding on the DIT effect, but also have potential applications in quantum networks.
We present the differences between Input-Output formalism (IOF) and Incoherent Pumping Mechanism (IPM) derived from Lindblad Master Equation approach in terms of the transmission spectrum of Coupled high-Q Cavity with Quantum Dot system in the strong coupling regime. Fullwidth- half-maximum (FWHM) and the peak transmission of Dipole Induced Transparency (DIT) are inquired for detailed comparison in on-resonant and off-resonant conditions. We have found that DIT phenomenon in off-resonant case cannot be explained entirely by IPM although both methods can exhibit the same Vacuum Rabi splitting in on-resonant case. We have concluded that polariton having atomic-like feature in transmission spectrum could not be captured completely by IPM.