Quantum technology: from research to application

Schleich, Wolfgang P.; Ranade, Kedar S.; Anton, Christian; Arndt, Markus; Aspelmeyer, Markus; Bayer, М.; Berg, Gunnar; Calarco, Tommaso; Fuchs, Harald; Giacobino, E.; Grassl, Markus; Hänggi, Peter; Heckl, Wolfgang M.; Hertel, I. V.; Huelga, Susana F.; Jelezko, Fedor; Keimer, B.; Kotthaus, J. P.; Leuchs, Gerd; Lütkenhaus, Norbert; Maurer, Ueli; Pfau, Tilman; Plenio, Martin B.; Rasel, Ernst M.; Renn, Ortwin; Silberhorn, Christine; Schiedmayer, Jörg; Schmitt‐Landsiedel, D.; Schönhammer, K.; Ustinov, A. V.; Walther, Philip; Weinfurter, Harald; Welzl, Emo; Wiesendanger, R.; Wolf, Stefan; Zeilinger, Anton; Zoller, P.

doi:10.1007/s00340-016-6353-8

Cited by 58 publications

(62 citation statements)

References 9 publications

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“…with the measured state given in equation (2), the CRB constitutes the ultimate limit on the precision attained by the protocol of figure 2 given a particular:initial state ρ ( N) (0), POVM { } M x x , and protocol duration t. Importantly, the optimization of equation (4) over measurements can be completely avoided in the quantum setting, as one may first explicitly maximise the FI over all POVMs by defining the Quantum-Fisher-Information (QFI) as [23]:…”

Section: Ultimate Precision Attained In Quantum Frequency Estimationmentioning

confidence: 99%

“…As emphasized before, we assume that the probes are affected identically and independently by their environments, so that the global dynamics is fixed by the one-particle dynamics, see figure 2 and equation (2). Therefore, we focus on the microscopic derivation of the open-system dynamics of one probe, which we present in the following.…”

Section: Spin-boson Model: Weak-coupling Master Equation and Secular mentioning

confidence: 99%

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Fundamental limits to frequency estimation: a comprehensive microscopic perspective

Haase¹,

Smirne²,

Kołodyński³

et al. 2018

New J. Phys.

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We consider a metrology scenario in which qubit-like probes are used to sense an external field that affects their energy splitting in a linear fashion. Following the frequency estimation approach in which one optimizes the state and sensing time of the probes to maximize the sensitivity, we provide a systematic study of the attainable precision under the impact of noise originating from independent bosonic baths. Specifically, we invoke an explicit microscopic derivation of the probe dynamics using the spin-boson model with weak coupling of arbitrary geometry. We clarify how the secular approximation leads to a phase-covariant (PC) dynamics, where the noise terms commute with the field Hamiltonian, while the inclusion of non-secular contributions breaks the PC. Moreover, unless one restricts to a particular (i.e., Ohmic) spectral density of the bath modes, the noise terms may contain relevant information about the frequency to be estimated. Thus, by considering general evolutions of a single probe, we study regimes in which these two effects have a non-negligible impact on the achievable precision. We then consider baths of Ohmic spectral density yet fully accounting for the lack of PC, in order to characterize the ultimate attainable scaling of precision when N probes are used in parallel. Crucially, we show that beyond the semigroup (Lindbladian) regime the Zeno limit imposing the 1/N 3/2 scaling of the mean squared error, recently derived assuming PC, generalises to any dynamics of the probes, unless the latter are coupled to the baths in the direction perfectly transversal to the frequency encoding-when a novel scaling of 1/N 7/4 arises. As our microscopic approach covers all classes of dissipative dynamics, from semigroup to non-Markovian ones (each of them potentially non-phase-covariant), it provides an exhaustive picture, in which all the different asymptotic scalings of precision naturally emerge.

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Section: Ultimate Precision Attained In Quantum Frequency Estimationmentioning

confidence: 99%

Section: Spin-boson Model: Weak-coupling Master Equation and Secular mentioning

confidence: 99%

Fundamental limits to frequency estimation: a comprehensive microscopic perspective

Haase¹,

Smirne²,

Kołodyński³

et al. 2018

New J. Phys.

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“…Sensors based on atomic vapor can offer high performance across a range of applications. Because atoms have well-known properties and give reproducible measurements that can easily be related to SI units, they are ideal candidates for use in a new generation of sensors in the growing field of quantum technologies [20]. For example, atom-based sensors have been used for precise measurements of magnetic fields [21,22] and gravity [23,24] and are beginning to be marketed and used in fields as diverse as biomedical sensing [25], geomagnetic [26], and defense applications [27].…”

Section: Introductionmentioning

confidence: 99%

Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor

et al. 2020

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There is much interest in employing terahertz (THz) radiation across a range of imaging applications, but so far, technologies have struggled to achieve the necessary frame rates. Here, we demonstrate a THz imaging system based upon efficient THz-to-optical conversion in atomic vapor, where full-field images can be collected at ultrahigh speeds using conventional optical camera technology. For a 0.55-THz field, we show an effective 1-cm 2 sensor with near diffraction-limited spatial resolution and a minimum detectable power of ð190 AE 30Þ fW s −1=2 per ð40 × 40Þ μm 2 pixel capable of video capture at 3000 frames per second. This combination of speed and sensitivity represents a step change in the state of the art of THz imaging and will likely lead to its uptake in wider industrial settings.

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“…Typically, the investigation of novel and functionalized materials has been of great importance for the optimization and development of various technologies, for example, based on electrical, [1][2][3] optical, [4] optoelectronic, [5,6] or micromechanic devices, [7] and the introduction of new technologies, such as quantum technologies. [8][9][10] From such devices, one does not only expect higher efficiencies, but access to the development of utterly new concepts, which are strongly demanded by modern information processing, quantum or medical technologies and sensing applications. Particularly, nanomaterials open up new avenues for environmental-friendly as well as energy-efficient DOI: 10.1002/andp.202000015 optoelectronic technologies, [11,12] biophysics, [13,14] and the field of integrated photonics, [15] to name but a few.…”

Section: Introductionmentioning

confidence: 99%

Advances in Functional Nanomaterials Science

Rahimi‐Iman

2020

Annalen der Physik

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Technologies employing nanomaterials, such as electronics, optoelectronics, nanobiotechnologies, quantum optics, and nanophotonics, are perceived as the key drivers of investigations on novel and functional materials and their nanostructures for various applications. It is well understood that the study of such materials and structures has been of great importance for the optimization and development of electrical and optical devices. From such devices, one does not only expect higher efficiencies, but also access to the development of completely new concepts, which are strongly demanded by modern information‐processing, quantum, or medical technologies, and sensing applications. In this context, a wide range of aspects such as the physics of novel materials, as well as materials engineering, characterization, and applications are summarized here. Novel materials, which can be used, for instance, for energy harvesting or light generation, as well as for future logic devices; material engineering, which can lead to improved device functionality and performance in optoelectronics; material physics, the study of which allows insight to be gained into optical and electrical properties of nanostructured systems and quantum materials; and technologies/devices, addressing progress on the application side of sophisticated material systems and quantum structures, are highlighted using representative examples.

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Quantum technology: from research to application

Cited by 58 publications

References 9 publications

Fundamental limits to frequency estimation: a comprehensive microscopic perspective

Fundamental limits to frequency estimation: a comprehensive microscopic perspective

Full-Field Terahertz Imaging at Kilohertz Frame Rates Using Atomic Vapor

Advances in Functional Nanomaterials Science

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