Photonic quantum metrology

Polino, Emanuele; Valeri, Mauro; Spagnolo, Nicolò; Sciarrino, Fabio

doi:10.1116/5.0007577

Cited by 338 publications

(271 citation statements)

References 957 publications

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“…In this sense, any quantum system must minimize the CRB causing it to be lower than SQL and approaching HL. The basic concepts behind quantum metrology, with particular attention to phase estimation, have been reviewed [ 3 , 4 ], where the authors describe the current state-of-the art in terms of platforms, quantum resources, and current experimental and theoretical challenges.…”

Section: Advanced Quantum Sensing Techniquesmentioning

confidence: 99%

Design of an on-Chip Room Temperature Group-IV Quantum Photonic Chem/Bio Interferometric Sensor Based on Parity Detection

2020

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We propose and analyze three Si-based room-temperature strip-guided “manufacturable” integrated quantum photonic chem/bio sensor chips operating at wavelengths of 1550 nm, 1330 nm, and 640 nm, respectively. We propose design rules that will achieve super-sensitivity (above the classical limit) by means of mixing between states of coherent light and single-mode squeezed-light. The silicon-on-insulator (SOI), silicon-on-sapphire (SOS), and silicon nitride-on-SiO2-on Si (SiN) platforms have been investigated. Each chip is comprised of photonic building blocks: a race-track resonator, a pump filter, an integrated Mach-Zehnder interferometric chem/bio sensor, and a photonic circuit to perform parity measurements, where our homodyne measurement circuit avoids the use of single-photon-counting detectors and utilizes instead conventional photodetectors. A combination of super-sensitivity with super-resolution is predicted for all three platforms to be used for chem/bio sensing applications.

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Section: Advanced Quantum Sensing Techniquesmentioning

confidence: 99%

Design of an on-Chip Room Temperature Group-IV Quantum Photonic Chem/Bio Interferometric Sensor Based on Parity Detection

2020

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“…Notable examples are the following: detection of gravitational waves [4], atomic clocks [5], measurement on biological systems [6], measurements of forces [7], lithography [8,9], imaging [10,11], spectroscopy and frequency measurements [12,13]. In this context, the fundamental bounds on the achievable sensitivity are provided by quantum mechanical laws [14][15][16][17]. More specifically, the goal of quantum metrology is to exploit quantum probes to enhance the achievable sensitivity with respect to classical strategies.…”

Section: Introductionmentioning

confidence: 99%

“…More specifically, the goal of quantum metrology is to exploit quantum probes to enhance the achievable sensitivity with respect to classical strategies. One of the most important physical systems employed for phase estimation is represented by photons [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…In the limited data scenario [28,29], there is no standard protocol to reach the ultimate bounds, while different recipes can be adopted. Among different approaches (even protective measurements can be exploited [30]), a powerful tool to enhance the convergence of the estimation is provided by adaptive schemes [17,31]. Adaptive protocols employ additional control parameters during the estimation process, which are in general tuned according to the acquired knowledge on the system [32,33].…”

Section: Introductionmentioning

confidence: 99%

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Adaptive phase estimation through a genetic algorithm

Rambhatla

D'Aurelio

Valeri

et al. 2020

Phys. Rev. Research

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Quantum metrology is one of the most relevant applications of quantum information theory to quantum technologies. Here, quantum probes are exploited to overcome classical bounds in the estimation of unknown parameters. In this context, phase estimation, where the unknown parameter is a phase shift between two modes of a quantum system, is a fundamental problem. In practical and realistic applications, it is necessary to devise methods to optimally estimate an unknown phase shift by using a limited number of probes. Here we introduce and experimentally demonstrate a machine learning-based approach for the adaptive estimation of a phase shift in a Mach-Zehnder interferometer, tailored for optimal performances with limited resources. The employed technique is a genetic algorithm used to devise the optimal feedback phases employed during the estimation in an offline fashion. The results show the capability to retrieve the true value of the phase by using few photons, and to reach the sensitivity bounds in such small probe regime. We finally investigate the robustness of the protocol with respect to common experimental errors, showing that the protocol can be adapted to a noisy scenario. Such approach promises to be a useful tool for more complex and general tasks where optimization of feedback parameters is required.

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“…The fields of optical metrology and imaging have benefited in recent years due to the development of quantum estimation theory [20][21][22]. For example, application of this quantum formalism to the classical optical problem of resolving two incoherent point sources has led to schemes for optical superresolution that go beyond the Rayleigh criterion [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Interferometric sensing of the tilt angle of a Gaussian beam

Walborn

Aguilar

Saldanha

et al. 2020

Phys. Rev. Research

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We investigate interferometric techniques to estimate the deflection angle of an optical beam and compare them to the direct detection of the beam deflection. We show that quantum metrology methods lead to a unifying treatment for both single photons and classical fields. Using the Fisher information to assess the precision limits of the interferometric schemes, we show that the precision can be increased by exploiting the initial transverse displacement of the beam. This gain, which is present for both Sagnac and Mach-Zehnder-like configurations, can be considerable when compared to noninterferometric methods. In addition to the fundamental increase in precision, the interferometric schemes have the technical advantage that (i) the precision limits can be saturated by a sole polarization measurement on the field, and that (ii) the detection system can be placed at any longitudinal position along the beam. We also consider position-dependent polarization measurements, and show that in this case the precision increases with the propagation distance, as well as the initial transverse displacement.

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Photonic quantum metrology

Cited by 338 publications

References 957 publications

Design of an on-Chip Room Temperature Group-IV Quantum Photonic Chem/Bio Interferometric Sensor Based on Parity Detection

Design of an on-Chip Room Temperature Group-IV Quantum Photonic Chem/Bio Interferometric Sensor Based on Parity Detection

Adaptive phase estimation through a genetic algorithm

Interferometric sensing of the tilt angle of a Gaussian beam

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