Generation of single- and two-mode multiphoton states in waveguide QED

Paulisch, Vanessa; Kimble, H. J.; Cirac, J. I.; González-Tudela, Alejandro

doi:10.1103/physreva.97.053831

Cited by 11 publications

(9 citation statements)

References 46 publications

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“…Here, the quantum coherence of the constituting qubits is used to engineer a global optical response which depends on their quantum state [13][14][15][16] . With respect to quantum information processing, multi-qubit waveguide QED systems could be harnessed in numerous applications such as on demand, highly efficient creation of multi-photon and entangled states [17][18][19] , storage devices for microwave pulses 20 , atomic mirrors 21 , number-resolved photon detection 22 , slow and even stopped light 23 . Experimentally, waveguide QED systems have been realized on several platforms including atoms 24 , quantum dots coupled to nanophotonic waveguides 25 and defect centers in diamonds 26 .…”

Section: Introductionmentioning

confidence: 99%

Waveguide bandgap engineering with an array of superconducting qubits

et al. 2021

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Waveguide quantum electrodynamics offers a wide range of possibilities to effectively engineer interactions between artificial atoms via a one-dimensional open waveguide. While these interactions have been experimentally studied in the few qubit limit, the collective properties of such systems for larger arrays of qubits in a metamaterial configuration has so far not been addressed. Here, we experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control coupled to the mode continuum of a waveguide. By consecutively tuning the qubits to a common resonance frequency we observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. Making use of the qubits quantum nonlinearity, we demonstrate control over the latter by inducing a transparency window in the bandgap region of the ensemble. The circuit of this work extends experiments with one and two qubits toward a full-blown quantum metamaterial, thus paving the way for large-scale applications in superconducting waveguide quantum electrodynamics.

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Section: Introductionmentioning

confidence: 99%

Waveguide bandgap engineering with an array of superconducting qubits

et al. 2021

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“…The strong intrinsic nonlinearity of the qubits was recently shown to give rise to partially localized polaritons [7], topological edge states [8,9], and quantum correlations in the scattered light of the array [10]. With respect to quantum information processing, multi-qubit waveguide QED systems could be harnessed in numerous applications such as on demand, highly efficient creation of multi-photon and entangled states [11][12][13], storage devices for microwave pulses [14], atomic mirrors [15], number-resolved photon detection [16], slow and even stopped light [17]. Experimentally, waveguide QED systems have been realized on several platforms including atoms [18], quantum dots coupled to nanophotonic waveguides [19] and defect centers in diamonds [20].…”

Section: Introductionmentioning

confidence: 99%

Waveguide Bandgap Engineering with an Array of Superconducting Qubits

Brehm,

Poddubny,

Stehli

et al. 2020

Preprint

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In this work, we experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control coupled to the mode continuum of a superconducting waveguide. By consecutively tuning the qubits to a common resonance frequency we observe the formation of super-and subradiant states as well as the emergence of a polaritonic bandgap. Making use of the qubits strong intrinsic quantum nonlinearity we study the saturation of the collective modes with increasing photon number and electromagnetically induce a transparency window in the bandgap region of the ensemble, allowing to directly control the band structure of the array. The moderately scaled circuit of this work extends experiments with one and two qubits [1, 2] towards a fullblown quantum metamaterial, thus paving the way for large-scale applications in superconducting waveguide quantum electrodynamics.

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“…The form of decomposition Eq. (15) where left and right singular vectors are the same enforces the symmetricity condition ψ xy = ψ yx . Our analysis of the Schmidt decomposition confirms that most states are well approximated using the two largest singular values λ 1 and λ 2 , that have close absolute values.…”

Section: Fourier Analysis Of the Eigenstatesmentioning

confidence: 99%

“…Waveguide QED is promising for many applications in quantum information processing. It can allow us to efficiently generate [14][15][16] , detect 17 , slow 18 , and store quantum light 19 . It is also useful as a platform for quantum simulators of complex many-mode physics 20,21 .…”

Section: Introductionmentioning

confidence: 99%

Quantum Hall phases emerging from atom–photon interactions

Poshakinskiy

Zhong

et al. 2021

npj Quantum Inf

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We reveal the emergence of quantum Hall phases, topological edge states, spectral Landau levels, and Hofstadter butterfly spectra in the two-particle Hilbert space of an array of periodically spaced two-level atoms coupled to a waveguide (waveguide quantum electrodynamics). While the topological edge states of photons require fine-tuned spatial or temporal modulations of the parameters to generate synthetic magnetic fields and the quantum Hall effect, here we demonstrate that a synthetic magnetic field can be self-induced solely by atom–photon interactions. The fact that topological order can be self-induced in what is arguably the simplest possible quantum structure shows the richness of these waveguide quantum electrodynamics systems. We believe that our findings will advance several research disciplines including quantum optics, many-body physics, and nonlinear topological photonics, and that it will set an important reference point for the future experiments on qubit arrays and quantum simulators.

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Generation of single- and two-mode multiphoton states in waveguide QED

Cited by 11 publications

References 46 publications

Waveguide bandgap engineering with an array of superconducting qubits

Waveguide bandgap engineering with an array of superconducting qubits

Waveguide Bandgap Engineering with an Array of Superconducting Qubits

Quantum Hall phases emerging from atom–photon interactions

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