Quantum optical emulation of molecular vibronic spectroscopy using a trapped-ion device

Shen, Yangchao; Lu, Yao; Zhang, Kuan; Zhang, Junhua; Zhang, Shuaining; Huh, Joonsuk; Kim, Kihwan

doi:10.1039/c7sc04602b

Cited by 62 publications

(76 citation statements)

References 33 publications

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“…Of primary interest in this paper is to engineer a relatively strong unitary beam-splitter interaction characterized by g BS in Eq. (9). For this purpose, as we will show, it is important to design the cavity frequencies ω a,b to be far away from any resonant structures of the susceptibility χ(ω a , ω b ), so that κ BS is largely suppressed and g BS is relatively strong.…”

Section: Ancilla-induced Beam-splitter Interaction Between the Cavitymentioning

confidence: 93%

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Engineering bilinear mode coupling in circuit QED: Theory and experiment

et al. 2019

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Photonic states of high-Q superconducting microwave cavities controlled by superconducting transmon ancillas provide a platform for encoding and manipulating quantum information. A key challenge in scaling up the platform towards practical quantum computation is the requirement to communicate on demand the quantum information stored in the cavities. It has been recently demonstrated that a tunable bilinear interaction between two cavity modes can be realized by coupling the modes to a bichromatically-driven superconducting transmon ancilla, which allows swapping and interfering the multi-photon states stored in the cavity modes [Gao et al., Phys. Rev. X 8, 021073(2018)]. Here, we explore both theoretically and experimentally the regime of relatively strong drives on the ancilla needed to achieve fast SWAP gates but which can also lead to undesired non-perturbative effects that lower the SWAP fidelity. We develop a theoretical formalism based on linear response theory that allows one to calculate the rate of ancilla-induced interaction, decay and frequency shift of the cavity modes in terms of a susceptibility matrix. We go beyond the usual perturbative treatment of the drives by using Floquet theory, and find that the interference of the two drives can strongly alter the system dynamics even in the regime where the standard rotating wave approximation applies. The drive-induced AC Stark shift on the ancilla depends non-trivially on the drive and ancilla parameters which in turn modify the strength of the engineered interaction. We identify two major sources of infidelity due to ancilla decoherence. i) Ancilla dissipation and dephasing lead to incoherent hopping among Floquet states which occurs even when the ancilla is at zero temperature; this hopping results in a sudden change of the SWAP rate, thereby decohering the SWAP operation. ii) The cavity modes inherit finite decay from the relatively lossy ancilla through the inverse Purcell effect; the effect becomes particularly strong when the AC Stark shift pushes certain ancilla transition frequencies to the vicinity of the cavity mode frequencies. The theoretical predictions agree quantitatively with the experimental results, paving the way for using the developed theory for optimizing future experiments and architecture designs.

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Section: Ancilla-induced Beam-splitter Interaction Between the Cavitymentioning

confidence: 93%

“…These operations can empower novel schemes for universal bosonic quantum computation [6]. The two-mode squeezing interaction, along with single-mode squeezing and beam-splitter interaction enables an essential set of operations needed for Gaussian quantum information processing [7] and quantum simulations of molecular spectra [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Engineering bilinear mode coupling in circuit QED: Theory and experiment

et al. 2019

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“…Various experimental platforms that make use of quantum harmonic oscillators have been used to simulate vibronic spectra, as shown by recent experiments using superconducting devices [12] and trapped ions [13]. Moreover, the original theoretical proposal [2] suggests the use of quantum optics, in which each mode of the electromagnetic field is modelled as a quantum harmonic oscillator.…”

Section: Introductionmentioning

confidence: 99%

Approximating vibronic spectroscopy with imperfect quantum optics

Clements

Renema

Eckstein

et al. 2018

J. Phys. B: At. Mol. Opt. Phys.

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We study the impact of experimental imperfections on a recently proposed protocol for performing quantum simulations of vibronic spectroscopy. Specifically, we propose a method for quantifying the impact of these imperfections, optimizing an experiment to account for them, and benchmarking the results against a classical simulation method. We illustrate our findings using a proof of principle experimental simulation of part of the vibronic spectrum of tropolone. Our findings will inform the design of future experiments aiming to simulate the spectra of large molecules beyond the reach of current classical computers.Contribution of NIST, an agency of the U.S. government, not subject to copyright. arXiv:1710.08655v3 [quant-ph]

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“…Our proposal is complementary to other applications and proposals for using superconducting circuits [7] and other quantum architectures [8] to obtain answers to different questions posed in the realm of molecular physics and quantum chemistry, such as the study of groundstate properties of certain molecules [9] or transport phenomena [10]. It has already been shown that cavity arrays with qubits and boson-sampling techniques [5] can provide information about molecular vibrational spectra and that they may be implemented using superconducting circuits [11].…”

Section: Introductionmentioning

confidence: 83%

Quantum Emulation of Molecular Force Fields: A Blueprint for a Superconducting Architecture

et al. 2017

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In this work, we propose a flexible architecture of microwave resonators with tunable couplings to perform quantum simulations of problems from the field of molecular chemistry. The architecture builds on the experience of the D-Wave design, working with nearly harmonic circuits instead of qubits. This architecture, or modifications of it, can be used to emulate molecular processes such as vibronic transitions. Furthermore, we discuss several aspects of these emulations, such as dynamical ranges of the physical parameters, quenching times necessary for diabaticity, and, finally, the possibility of implementing anharmonic corrections to the force fields by exploiting certain nonlinear features of superconducting devices.

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Quantum optical emulation of molecular vibronic spectroscopy using a trapped-ion device

Abstract: Here, we present the first quantum device that generates a molecular spectroscopic signal with the phonons in a trapped ion system, using SO2 as an example.

Cited by 62 publications

References 33 publications

Engineering bilinear mode coupling in circuit QED: Theory and experiment

Engineering bilinear mode coupling in circuit QED: Theory and experiment

Approximating vibronic spectroscopy with imperfect quantum optics

Quantum Emulation of Molecular Force Fields: A Blueprint for a Superconducting Architecture

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