Parameter estimation in plasmonic QED

Jahromi, Hossein Rangani

doi:10.1016/j.optcom.2017.11.020

Cited by 16 publications

(13 citation statements)

References 52 publications

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“…* benjamin.rousseaux@chalmers.se Although strong coupling between high-Q dielectric cavities and single emitters, such as atoms, quantum dots, and superconducting qubits has been the subject of intense research [26][27][28][29], much less progress has been made in the realization of strong coupling between single emitters and plasmonic nanostructures. The ability to strongly couple a single QE to a nanoscale plasmonic antenna would be extra beneficial for quantum information processing applications [30][31][32][33]. Although observations of Rabi splitting with ensembles of quantum emitters coupled to plasmonic structures have been widely reported [13,[34][35][36][37][38][39], only a few recent reports claimed observation of Rabi splitting with a single QE [40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Quantum description and emergence of nonlinearities in strongly coupled single-emitter nanoantenna systems

et al. 2018

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Käll, M. et al (2018) Quantum description and emergence of nonlinearities in strongly coupled single-emitter nanoantenna systems PHYSICAL REVIEW B, 98(4) http://dx.Realizing strong coupling between a single quantum emitter (QE) and an optical cavity is of crucial importance in the context of various quantum optical applications. Although Rabi splitting of single quantum emitters coupled to high-Q classical cavities has been reported in numerous configurations, attaining single emitter Rabi splitting with a plasmonic nanostructure remains a challenge. In particular, strong coupling at the single QE regime would open the path for the realization of single-photon nonlinearities. In this paper, we derive a plasmon quantization procedure for systems consisting of a single QE located in the gap of a nanoantenna. This procedure leads to the description of the quantum dynamics by a master equation for the state of the QE and the quantized plasmonic modes, which is crucial to demonstrate the emergence of single-photon nonlinearities. We investigate numerically the optical response and the resulting Rabi splitting in metallic nanoantennas and find the optimal geometries for the emergence of the strong-coupling regime with single QEs. Finally, we demonstrate the saturation of hybridized modes for a chosen configuration. Our results will be useful for implementation of realistic quantum plasmonic nanosystems involving single QEs at room temperature.

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Section: Introductionmentioning

confidence: 99%

Quantum description and emergence of nonlinearities in strongly coupled single-emitter nanoantenna systems

et al. 2018

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“…Another important question is how we can practically design the optimal estimation, i.e., a practically feasible measurement whose Fisher information is equal to the QFI. For answering this question, we should compute the SLD, since the optimal POVM can be constructed by the eigenvectors of the SLD [6,10]. Using Eq.…”

Section: Feasible Measurement For Optimal Estimationmentioning

confidence: 99%

“…The classical approach to decrease the statistical error is increase in the the resources for the measurement according to the central limit theorem; but this method is not always desirable or efficient [2]. Quantum parameter estimation theory describes strategies allowing the estimation precision to surpass the limit of classical approaches [3][4][5][6][7][8][9][10][11][12]. When the quantum system is sampled N times, different strategies [13] allowing one to achieve the Heisenberg limit, can be designed such that the variance of the estimated parameter scales as 1/N 2 .…”

Section: Introductionmentioning

confidence: 99%

Quantum thermometry in a squeezed thermal bath

Jahromi

2018

Preprint

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We address the dephasing dynamics of the quantum Fisher information (QFI) for the process of quantum thermometry with probes coupled to squeezed thermal baths via the nondemolition interaction. We also calculate the upper bound for the parameter estimation and investigate how the optimal estimation is affected by the initial conditions and decoherence, particularly the squeezing parameters. Moreover, the feasibility of the optimal measurement of the temperature is discussed in detail. Then, the results are generalized for entangled probes and the multi-qubit scenarios for probing the temperature are analysed. Our results show that the squeezing can decrease the number of channel uses for optimal thermometry. Comparing different schemes for multi-qubit estimation, we find that an increase in the number of the qubits, interacting with the channel, does not necessarily vary the precision of estimating the temperature. Besides, we discuss the enhancement of the quantum thermometry using the parallel strategy and starting from the W state.

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“…Interestingly, employing quantum systems to estimate unknown parameters overcomes the precision limits that can be, in principle, achieved by applying only classical resources. This idea is at the heart of the continuously growing research area of quantum metrology aiming at reaching the ultimate fundamental bounds on estimation precision by using quantum probes [9][10][11][12][13][14][15][16][17][18][19][20][21]. This field of research has attracted a great deal of interest in the last few years, leading to notable developments both theoretically and experimentally as reported in previous review papers concerning quantum phase estimation problems [22] optical metrology [23][24][25][26][27], multiparameter estimation scenario [28][29][30][31], and metrological tasks performed by various physical systems [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Estimating energy levels of a three-level atom in single and multi-parameter metrological schemes

Jahromi¹,

Radgohar²,

Hosseiny³

et al. 2021

Preprint

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Determining the energy levels of a quantum system is a significant task, for instance, to analyze reaction rates in drug discovery and catalysis or characterize the compatibility of materials. In this paper we exploit quantum metrology, the research field focusing on the estimation of unknown parameters exploiting quantum resources, to address this problem for a three-level system interacting with laser fields. The performance of simultaneous estimation of the levels compared to independent one is also investigated in various scenarios. Moreover, we introduce, the Hilbert-Schmidt speed (HSS), a special type of quantum statistical speed, as a powerful figure of merit for enhancing estimation of energy spectrum. This measure is easily computable, because it does not require diagonalization of the system state, verifying its efficiency in high-dimensional systems.

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Parameter estimation in plasmonic QED

Cited by 16 publications

References 52 publications

Quantum description and emergence of nonlinearities in strongly coupled single-emitter nanoantenna systems

Quantum description and emergence of nonlinearities in strongly coupled single-emitter nanoantenna systems

Quantum thermometry in a squeezed thermal bath

Estimating energy levels of a three-level atom in single and multi-parameter metrological schemes

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