Collapse and Revival of an Artificial Atom Coupled to a Structured Photonic Reservoir

Ferreira, Vinicius S.; Banker, Jash; Sipahigil, Alp; Matheny, Matthew H.; Keller, Andrew J.; Kim, Eunjong; Mirhosseini, Mohammad; Painter, Oskar

doi:10.48550/arxiv.2001.03240

Cited by 8 publications

(18 citation statements)

References 63 publications

(98 reference statements)

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“…( 1), 4J ≈ ω 21 −ω 1 and we extract J/2π = 249 MHz. Comparing it to previous realizations of microwave coupled cavity arrays [33,34], we achieve a larger value for J with a smaller coupling capacitance, thanks to the higher impedance of the resonator (J = 1 2 C J ω 2 r Z r ). From electrostatic simulations we estimate the resonator impedance to be Z r = 1/ω r C r ≈ 312 Ω.…”

Section: Bare Coupled Cavity Arraymentioning

confidence: 56%

“…At microwave frequencies, this constraint results in a large footprint, which limits the number of unit cells that can be accommodated on a chip to a dozen and hinders the integration of additional measurement and control circuitry. A new avenue was opened by the introduction of superconducting metamaterials with a deep subwavelength lattice constant, consisting of a set of lumpedelement resonators periodically loading a transmission line, or arranged in a linear chain to form a coupled-cavity array [32][33][34]. In these embodiments, the lattice footprint is drastically reduced (nearly two orders of magnitude) and the photonic cloud is more strongly confined.…”

Section: Introductionmentioning

confidence: 99%

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Extensible quantum simulation architecture based on atom-photon bound states in an array of high-impedance resonators

Scigliuzzo¹,

Calajò²,

Ciccarello³

et al. 2021

Preprint

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Engineering the electromagnetic environment of a quantum emitter gives rise to a plethora of exotic light-matter interactions. In particular, photonic lattices can seed long-lived atom-photon bound states inside photonic band gaps. Here we report on the concept and implementation of a novel microwave architecture consisting of an array of compact, high-impedance superconducting resonators forming a 1 GHz-wide pass band, in which we have embedded two frequency-tuneable artificial atoms. We study the atom-field interaction and access previously unexplored coupling regimes, in both the single-and double-excitation subspace. In addition, we demonstrate coherent interactions between two atom-photon bound states, in both resonant and dispersive regimes, that are suitable for the implementation of SWAP and CZ two-qubit gates. The presented architecture holds promise for quantum simulation with tuneable-range interactions and photon transport experiments in nonlinear regime.

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Section: Bare Coupled Cavity Arraymentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Extensible quantum simulation architecture based on atom-photon bound states in an array of high-impedance resonators

Scigliuzzo¹,

Calajò²,

Ciccarello³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…7. In particular superradiant and subradiant behaviors arise as appropriate combinations of the symmetry of the initial state, the coupling strength, and the relative distance between the emitters, reflecting the complex relation between the Hamiltonian parameters in this regime, which has to be taken into account in real experiments aiming to investigate non-Markovian delay dynamics in waveguide-QED [70]. As complementary information we show in Fig.…”

Section: Time-dependent Decay Ratementioning

confidence: 82%

Distant emitters in ultrastrong waveguide QED: Ground-state properties and non-Markovian dynamics

González-Gutiérrez,

Román-Roche,

Zueco

2021

Preprint

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Starting from the paradigmatic spin-boson model (SBM), we investigate the static and dynamical properties of a system of two distant two-level emitters coupled to a one-dimensional Ohmic waveguide beyond the rotating wave approximation (RWA). Employing static and dynamical polaron ansätze we study the effects of finite separation distance on the behavior of the photon-mediated Ising-like interaction, qubit frequency renormalization, ground state magnetization, and entanglement entropy of the two qubit system. Based on previous works we derive an effective approximate Hamiltonian for the two-impurity SBM that preserves the excitation-number and thus facilitates the analytical treatment. In particular, it allows us to introduce non-Markovianity arising from delayfeedback effects in two distant emitters in the so-called ultrastrong coupling (USC) regime. We test our results with numerical simulations performed over a discretized circuit-QED model, finding perfect agreement with previous results, and showing interesting new dynamical effects arising in ultrastrong waveguide-QED with distant emitters. In particular, we revisit the Fermi two-atom problem showing that, in the USC regime, initial correlations yield two different evolutions for symmetric and antisymmetric states even before the emitters become causally connected. Finally, we demonstrate that the collective dynamics, e.g., superradiance or subradiance, are affected not only by the distance between emitters, but also on the coupling, due to significant frequency renormalization. This constitutes another dynamical consequence of the USC regime.

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“…Thus, an interesting future work would be to further optimize the filter design to maximize the engineered cooling rate. Note also that filters can be implemented experimentally using quantum metamaterials [32].…”

mentioning

confidence: 99%

Stabilizing a Bosonic Qubit using Colored Dissipation

Putterman,

Iverson,

et al. 2021

Preprint

Self Cite

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Biased-noise qubits are a promising candidate for realizing hardware efficient fault-tolerant quantum computing. One promising biased-noise qubit is the Kerr cat qubit, which has recently been demonstrated experimentally. Despite various unique advantages of Kerr cat qubits, we explain how the noise bias of Kerr cat qubits is severely limited by heating-induced leakage in their current implementations. Then, we show that by adding frequency-selective single-photon loss to Kerr cat qubits we can counteract the leakage and thus recover much of their noise bias. We refer to such Kerr cat qubits combined with frequency-selective single-photon loss as colored Kerr cat qubits as they are protected by a colored dissipation. In particular, we show how a suitably engineered lossy environment can suppress the leakage and bit-flip errors of a Kerr cat qubit while not introducing any additional phase-flip errors. Since our scheme only requires single-photon loss, it can be readily implemented by using passive and linear elements. Moreover, our frequency-selectivity technique can be generally applied to energy-gap protected qubits whose computational basis states are given by near degenerate ground states of a Hamiltonian with a non-zero energy gap between the ground and excited state manifolds.

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Collapse and Revival of an Artificial Atom Coupled to a Structured Photonic Reservoir

Cited by 8 publications

References 63 publications

Extensible quantum simulation architecture based on atom-photon bound states in an array of high-impedance resonators

Extensible quantum simulation architecture based on atom-photon bound states in an array of high-impedance resonators

Distant emitters in ultrastrong waveguide QED: Ground-state properties and non-Markovian dynamics

Stabilizing a Bosonic Qubit using Colored Dissipation

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