Quantum memory and gates using a 
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-type quantum emitter coupled to a chiral waveguide

Li, Tao; Miranowicz, Adam; Hu, Xuedong; Xia, Keyu; Nori, Franco

doi:10.1103/physreva.97.062318

Cited by 81 publications

(35 citation statements)

References 91 publications

(169 reference statements)

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“…The most extreme case is chiral (or one-way) coupling [7][8][9]. Exploiting chiral light-matter interactions is predicted to lead to a host of exciting applications in quantum communication, information, and computing, including nonreciprocal singlephoton devices [10][11][12], optical isolators [13], optical circulators [14,15], integrated quantum optical circuits [16][17][18][19], and quantum networks [20][21][22][23]. Concurrently, new horizons in more fundamental aspects are expected, such as in quantum entanglement [24], unconventional many-body states [25], and emergent quasiparticles [26].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric coupling between two quantum emitters

et al. 2020

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We study a prototypical model of two coupled two-level systems, where the competition between coherent and dissipative coupling gives rise to a rich phenomenology. In particular, we analyze the case of asymmetric coupling, as well as the limiting case of chiral (or one-way) coupling. We investigate various quantum optical properties of the system, including its steady-state populations, power spectrum, and second-order correlation functions, and outline the characteristic features which emerge in each quantity as one sweeps through the nontrivial landscape of effective complex couplings. Most importantly, we reveal instances of population trapping, unexpected spectral features, and strong emission correlations.

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Section: Introductionmentioning

confidence: 99%

Asymmetric coupling between two quantum emitters

et al. 2020

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“…Instead of classical optics, quantum optics provides a tool to control photon propagation, including electromagnetically induced transparency (EIT) [27][28][29], optical non-reciprocity [30][31][32] and chirality [33][34][35][36][37][38]. Light propagating in a "moving" Bragg lattice created in atoms is subject to a "macroscopic" Doppler effect and has demonstrated non-reciprocity [39][40][41].…”

mentioning

confidence: 99%

Cavity-Free Optical Isolators and Circulators Using a Chiral Cross-Kerr Nonlinearity

2018

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Optical nonlinearity has been widely used to try to produce optical isolators. However, this is very difficult to achieve due to dynamical reciprocity. Here, we show the use of the chiral cross-Kerr nonlinearity of atoms at room temperature to realize optical isolation, circumventing dynamical reciprocity. In our approach, the chiral cross-Kerr nonlinearity is induced by the thermal motion of N-type atoms. The resulting cross phase shift and absorption of a weak probe field are dependent on its propagation direction. This proposed optical isolator can achieve more than 30 dB of isolation ratio, with a low loss of less than 1 dB. By inserting this atomic medium in a Mach-Zehnder interferometer, we further propose a four-port optical circulator with a fidelity larger than 0.9 and an average insertion loss less than 1.6 dB. Using atomic vapor embedded in a on-chip waveguide, our method may provide chip-compatible optical isolation at the single-photon level of a probe field.

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“…An efficient interface, between a single photon and a single emitter, constitutes a necessary building block for various kinds of quantum tasks, especially for longdistance or distributed quantum networks [2,65]. To begin with, we consider a process of single-photon scattering by a four-level emitter coupled to a one-dimensional system, such as a QD coupled to a micropillar cavity or a photonic nanocrystal waveguide [81][82][83][84][85][86]. A singlycharged self-assembled In(Ga)As QD has four energy levels [85][86][87]: two ground states of J z = ±1/2, denoted as | ↑ and | ↓ , respectively; and two optically excited trion states X − , consisting of two electrons and one hole, with J z = ±3/2, denoted as | ↑↓⇑ and | ↑↓⇓ , respectively.…”

Section: Single-photon Qnd Detectormentioning

confidence: 99%

Resource-efficient analyzer of Bell and Greenberger-Horne-Zeilinger states of multiphoton systems

Miranowicz

Xia

et al. 2019

Phys. Rev. A

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We propose a resource-efficient error-rejecting entangled-state analyzer for polarization-encoded multiphoton systems. Our analyzer is based on two single-photon quantum-nondemolition detectors, where each of them is implemented with a four-level emitter (e.g., a quantum dot) coupled to a onedimensional system (such as a micropillar cavity or a photonic nanocrystal waveguide). The analyzer works in a passive way and can completely distinguish 2 n Greenberger-Horne-Zeilinger (GHZ) states of n photons without using any active operation or fast switching. The efficiency and fidelity of the GHZ-state analysis can, in principle, be close to unity, when an ideal single-photon scattering condition is fulfilled. For a nonideal scattering, which typically reduces the fidelity of a GHZstate analysis, we introduce a passively error-rejecting circuit to enable a near-perfect fidelity at the expense of a slight decrease of its efficiency. Furthermore, the protocol can be directly used to perform a two-photon Bell-state analysis. This passive, resource-efficient, and error-rejecting protocol can, therefore, be useful for practical quantum networks.

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Quantum memory and gates using a Λ -type quantum emitter coupled to a chiral waveguide

Cited by 81 publications

References 91 publications

Asymmetric coupling between two quantum emitters

Asymmetric coupling between two quantum emitters

Cavity-Free Optical Isolators and Circulators Using a Chiral Cross-Kerr Nonlinearity

Resource-efficient analyzer of Bell and Greenberger-Horne-Zeilinger states of multiphoton systems

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