Hybrid Rabi interactions with traveling states of light

Park, Ki‐Min; Laurat, Julien; Filip, Radim

doi:10.1088/1367-2630/ab6877

Cited by 4 publications

(2 citation statements)

References 116 publications

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“…Here Xθ = (âe iθ + â † e −iθ )/ √ 2 is a generalized quadrature operator of the oscillator with phase θ, for example the position X = X0 and the momentum P = Xπ/2 . For optical experiments, such a coupling [91] is currently under development [92].…”

Section: Displacement Estimation Using Rabi Interactionsmentioning

confidence: 99%

Quantum Rabi interferometry of motion and radiation

Park¹,

Hastrup²,

Marek³

et al. 2022

Preprint

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The precise determination of a displacement of a mechanical oscillator or a microwave field in a predetermined direction in phase space can be carried out with trapped ions or superconducting circuits, respectively, by coupling the oscillator with ancilla qubits. Through that coupling, the displacement information is transferred to the qubits which are then subsequently read out. However, unambiguous estimation of displacement in an unknown direction in the phase space has not been attempted in such oscillator-qubit systems. Here, we propose a hybrid oscillator-qubit interferometric setup for the unambiguous estimation of phase space displacements in an arbitrary direction, based on feasible Rabi interactions beyond the rotating-wave approximation. Using such a hybrid Rabi interferometer for quantum sensing, we show that the performance is superior to the ones attained by single-mode estimation schemes and a conventional interferometer based on Jaynes-Cummings interactions. Moreover, we find that the sensitivity of the Rabi interferometer is independent of the thermal occupation of the oscillator mode, and thus cooling it to the ground state before sensing is not required. We also perform a thorough investigation of the effect of qubit dephasing and oscillator thermalization. We find the interferometer to be fairly robust, outperforming different benchmark estimation schemes even for large dephasing and thermalization. I. INTRODUCTIONQuantum sensing is about estimating unknown processes of interest using a finite ensemble of probes and detectors with a sensitivity that goes beyond the reach of classical sensing [1-5]. Historically, optical probes have been at the center of this field due to the experimental accessibility of lasers and non-classical light resources, high-efficiency detectors, and the strong robustness of light to external noise sources [6][7][8][9]. Quantum optical interferometers exploit the interference between a probe and a reference beam to detect weak signals [10], a prominent example being the detection of gravitational waves from black hole mergers [11,12]. A similar approach can be adopted for microwave traveling waves [13], microwave cavity fields [14], matter waves [15,16], between light and atomic ensembles [17,18], and optomechanics [19][20][21].Numerous sensing proposals use quantum non-Gaussian states as probes for improved estimation of phase and displacement [22][23][24]. For example, quantum displacement sensing has been performed with Fock states and non-Gaussian superpositions of Fock states of the phononic modes of trapped ions [25,26]. Similarly, for superconducting circuits, the preparation of microwave Fock states and their superpositions has been recently mastered [27][28][29][30] as well as the preparation of non-Gaussian acoustic modes of a quartz crystal [31], which can be also used for measuring displacements. Superconducting transmon has been recently used for sensing magnons [32][33][34], search for dark matter [35], microwave radiometry [36][37][38] including sensing...

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Section: Displacement Estimation Using Rabi Interactionsmentioning

confidence: 99%

Quantum Rabi interferometry of motion and radiation

Park¹,

Hastrup²,

Marek³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The rotating-wave approximation is not valid within this model, and the unitary operator contains both rotating and counter-rotating terms. Strong Rabi coupling has been achieved experimentally in cavity QED systems such as trapped ions [73] or superconducting systems [75] among many other systems, and has been simulated in all-optical setup [76]. It can be used to create diverse classes of non-Gaussian effects such as nonlinear phase gates [77,78], which are essential in CV quantum information processing [3].…”

Section: Qubit Bypass Protocolmentioning

confidence: 99%

Slowing quantum decoherence of oscillators by hybrid processing

Park¹,

Hastrup²,

Neergaard-Nielsen³

et al. 2021

Preprint

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Quantum information encoded into superposition of coherent states is an illustrative representative of practical applications of macroscopic quantum coherence possessing. However, these states are very sensitive to energy loss, losing their non-classical aspects of coherence very rapidly. An available deterministic strategy to slow down this decoherence process is to apply a Gaussian squeezing transformation prior to the loss as a protective step. Here, we propose a deterministic hybrid protection scheme utilizing strong but feasible interactions with two-level ancillas immune to spontaneous emission. We verify robustness of the scheme against dephasing of qubit ancilla. Our scheme is applicable to complex superpositions of coherent states in many oscillators, and remarkably, the robustness to loss is enhanced with the amplitude of the coherent states. This scheme can be realized in experiments with atoms, solid-state systems and superconducting circuits.

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All-optical quantum computing using cubic phase gates

Budinger,

Furusawa,

van Loock

2024

Phys. Rev. Research

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If suitable quantum optical interactions were available, transforming the field mode operators in a nonlinear fashion, the all-photonics platform could be one of the strongest contenders for realizing a quantum computer. While single-photon qubits may be processed directly, “brighter” logical qubits may be embedded in individual oscillator modes, using so-called bosonic codes, for an in-principle fault-tolerant processing. In this paper, we show how elements of all-optical, universal, and fault-tolerant quantum computation can be implemented using only beam splitters together with single-mode cubic phase gates in reasonable numbers, and possibly off-line squeezed-state or single-photon resources. Our approach is based on a decomposition technique combining exact gate decompositions and approximate Trotterization. This allows for efficient decompositions of certain nonlinear continuous-variable multimode gates into the elementary gates, where the few cubic gates needed may even be weak or all identical, thus facilitating potential experiments. The final gate operations include two-mode controlled phase rotation and three-mode Rabi-type Hamiltonian gates, which are shown to be employable for realizing high-fidelity single-photon two-qubit entangling gates or creating high-quality Gottesman-Kitaev-Preskill states. We expect our method to be of general use with various applications, including those that rely on quartic Kerr-type interactions. Published by the American Physical Society 2024

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Hybrid Rabi interactions with traveling states of light

Cited by 4 publications

References 116 publications

Quantum Rabi interferometry of motion and radiation

Quantum Rabi interferometry of motion and radiation

Slowing quantum decoherence of oscillators by hybrid processing

All-optical quantum computing using cubic phase gates

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