A unidirectional on-chip photonic interface for superconducting circuits

Guimond, Pierre-Olivier; Vermersch, Benoît; Juan, Mathieu L.; Sharafiev, Aleksei; Kirchmair, Gerhard; Zoller, P.

doi:10.1038/s41534-020-0261-9

Cited by 67 publications

(51 citation statements)

References 97 publications

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“…This was recently answered affirmatively for a setup with two atoms that are both directly coupled to each other and each coupled at its own single point to a waveguide (∼ λ/4 apart) (Guimond et al 2020).…”

Section: Discussionmentioning

confidence: 92%

Quantum Optics with Giant Atoms—the First Five Years

Kockum

2020

Mathematics for Industry

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In quantum optics, it is common to assume that atoms can be approximated as point-like compared to the wavelength of the light they interact with. However, recent advances in experiments with artificial atoms built from superconducting circuits have shown that this assumption can be violated. Instead, these artificial atoms can couple to an electromagnetic field at multiple points, which are spaced wavelength distances apart. In this chapter, we present a survey of such systems, which we call giant atoms. The main novelty of giant atoms is that the multiple coupling points give rise to interference effects that are not present in quantum optics with ordinary, small atoms. We discuss both theoretical and experimental results for single and multiple giant atoms, and show how the interference effects can be used for interesting applications. We also give an outlook for this emerging field of quantum optics.

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Section: Discussionmentioning

confidence: 92%

Quantum Optics with Giant Atoms—the First Five Years

Kockum

2020

Mathematics for Industry

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“…While on the one hand our results show that directional emission could be used for state tomography and measuring entanglement, on the other hand one can use directional driving fields to prepare particular entangled states of the emitters. Such directional emission and state preparation protocols can allow for efficient and controllable routing of quantum information in quantum networks [31,32,54,55].…”

Section: Directional Emission-we Characterize the Probability Of Emit...mentioning

confidence: 99%

“…These effects have been extensively studied both theoretically [11,[13][14][15][16][17] and experimentally across various platforms [18][19][20][21][22][23][24][25][26][27][28][29][30]. Recent works have proposed collective effects for controlling the direction of emission using the non-local correlations between two emitters, with potential applications in quantum information processing and quantum error correction [31][32][33].…”

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confidence: 99%

Dissimilar collective decay and directional emission from two quantum emitters

Solano¹,

Barberis-Blostein²,

Sinha³

2021

Preprint

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We study a system of two distant quantum emitters coupled via a one-dimensional waveguide where the electromagnetic field has a direction-dependent velocity. As a consequence, the onset of collective emission is non-simultaneous and, for appropriate parameters, while one of the emitters exhibits superradiance the other can be subradiant. Interference effects enable the system to radiate in a preferential direction depending on the atomic state and the field propagation phases. We characterize such directional emission as a function of various parameters, delineating the conditions for optimal directionality.

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“…Such phenomena, known as "chiral quantum optics" in the literature [33,34], provide a new paradigm for quantum network engineering. To date, significant progress has been made on the basis of chiral quantum optics, such as cascaded quantum systems [35][36][37][38], deterministic photon routing [39,40], and non-destructive photon detection [41]. In experiments, chiral atom-field interactions can be achieved via several approaches, such as the spin-momentum locking effect of light in one-dimensional optical fibers [42][43][44], inserting circulators in superconducting circuits [45][46][47], topological engineering [48,49], and synthesizing artificial gauge fields [50].…”

Section: Introductionmentioning

confidence: 99%

Nonreciprocal frequency conversion with chiral $Λ$-type atoms

Du,

Chen,

2021

Preprint

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In this paper, we begin with a model of a Λ-type atom whose both transitions are chirally coupled to a waveguide and then extend the model to its giant-atom version. We investigate the singlephoton scatterings of the giant-atom model in both the Markovian and non-Markovian regimes. It is shown that the chiral atom-waveguide couplings enable nonreciprocal, reflectionless, and efficient frequency conversion, while the giant-atom structure introduces intriguing interference effects to the scattering behaviors, such as ultra-narrow scattering windows. The chiral giant-atom model exhibits quite different scattering spectra in the two regimes and, in particular, demonstrates non-Markovicity induced nonreciprocity under specific conditions. These phenomena can be understood from the effective detuning and decay rate of the giant-atom model. Our results have potential applications in integrated photonics and quantum network engineering.

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A unidirectional on-chip photonic interface for superconducting circuits

Cited by 67 publications

References 97 publications

Quantum Optics with Giant Atoms—the First Five Years

Quantum Optics with Giant Atoms—the First Five Years

Dissimilar collective decay and directional emission from two quantum emitters

Nonreciprocal frequency conversion with chiral $Λ$-type atoms

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