scholarly journals Idler-free multi-channel discrimination via multipartite probe states

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Cillian Harney ◽  
Stefano Pirandola
Keyword(s):  
General Framework ◽  
Multiple Quantum ◽  
Gaussian Channel ◽  
Quantum Metrology ◽  
Quantum Channels ◽  
Sensing Applications ◽  
Quantum Sensing ◽  
Real World Applications ◽  
Critical Insight ◽  
Quantum Strategy

AbstractThe characterisation of Quantum Channel Discrimination (QCD) offers critical insight for future quantum technologies in quantum metrology, sensing and communications. The task of multi-channel discrimination creates a scenario in which the discrimination of multiple quantum channels can be equated to the idea of pattern recognition, highly relevant to the tasks of quantum reading, illumination and more. Although the optimal quantum strategy for many scenarios is an entangled idler-assisted protocol, the extension to a multi-hypothesis setting invites the exploration of discrimination strategies based on unassisted, multipartite probe states. In this work, we expand the space of possible quantum-enhanced protocols by formulating general classes of unassisted multi-channel discrimination protocols which are not assisted by idler modes. Developing a general framework for idler-free protocols, we perform an explicit investigation in the bosonic setting, studying prominent Gaussian channel discrimination problems for real-world applications. Our findings uncover the existence of strongly quantum advantageous, idler-free protocols for the discrimination of bosonic loss and environmental noise. This circumvents the necessity for idler assistance to achieve quantum advantage in some of the most relevant discrimination settings, significantly loosening practical requirements for prominent quantum-sensing applications.

scholarly journals Terahertz quantum sensing

2020 ◽  
Vol 6 (11) ◽  
pp. eaaz8065 ◽  
Author(s):  
Mirco Kutas ◽  
Björn Haase ◽  
Patricia Bickert ◽  
Felix Riexinger ◽  
Daniel Molter ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Region Of Interest ◽  
Coherent Detection ◽  
Semiconductor Detectors ◽  
Terahertz Frequency ◽  
Sensing Applications ◽  
Highly Sensitive ◽  
Quantum Sensing ◽  
Thickness Measurements ◽  
Detection Schemes

Quantum sensing is highly attractive for accessing spectral regions in which the detection of photons is technically challenging: Sample information is gained in the spectral region of interest and transferred via biphoton correlations into another spectral range, for which highly sensitive detectors are available. This is especially beneficial for terahertz radiation, where no semiconductor detectors are available and coherent detection schemes or cryogenically cooled bolometers have to be used. Here, we report on the first demonstration of quantum sensing in the terahertz frequency range in which the terahertz photons interact with a sample in free space and information about the sample thickness is obtained by the detection of visible photons. As a first demonstration, we show layer thickness measurements with terahertz photons based on biphoton interference. As nondestructive layer thickness measurements are of high industrial relevance, our experiments might be seen as a first step toward industrial quantum sensing applications.

scholarly journals Augmenting Transfer Learning with Semantic Reasoning

2019 ◽  
Author(s):  
Freddy Lécué ◽  
Jiaoyan Chen ◽  
Jeff Z. Pan ◽  
Huajun Chen
Keyword(s):  
Transfer Learning ◽  
Real World ◽  
General Framework ◽  
Prediction Models ◽  
Learning Tasks ◽  
Real World Applications ◽  
Bus Delay ◽  
Robust Prediction ◽  
Air Quality Forecasting ◽  
Web Learning

Transfer learning aims at building robust prediction models by transferring knowledge gained from one problem to another. In the semantic Web, learning tasks are enhanced with semantic representations. We exploit their semantics to augment transfer learning by dealing with when to transfer with semantic measurements and what to transfer with semantic embeddings. We further present a general framework that integrates the above measurements and embeddings with existing transfer learning algorithms for higher performance. It has demonstrated to be robust in two real-world applications: bus delay forecasting and air quality forecasting.

Creation of silicon vacancy in silicon carbide by proton beam writing toward quantum sensing applications

2018 ◽  
Vol 51 (33) ◽  
pp. 333002 ◽  
Author(s):  
Takeshi Ohshima ◽  
Takahiro Satoh ◽  
Hannes Kraus ◽  
Georgy V Astakhov ◽  
Vladimir Dyakonov ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Proton Beam ◽  
Silicon Vacancy ◽  
Sensing Applications ◽  
Proton Beam Writing ◽  
Quantum Sensing

scholarly journals Towards joint reconstruction of noise and losses in quantum channels

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
F. Piacentini ◽  
A. Avella ◽  
P. Traina ◽  
L. Lolli ◽  
E. Taralli ◽  
...  
Keyword(s):  
Quantum Channel ◽  
Quantum Communication ◽  
Photon Number ◽  
Practical Implementation ◽  
Quantum Metrology ◽  
Quantum Channels ◽  
Transmission Losses ◽  
Single Measurement ◽  
Joint Reconstruction

AbstractThe calibration of a quantum channel, i.e. the determination of the transmission losses affecting it, is definitely one of the principal objectives in both the quantum communication and quantum metrology frameworks. Another task of the utmost relevance is the identification, e.g. by extracting its photon number distribution, of the noise potentially present in the channel.Here we present a protocol, based on the response of a photon-number-resolving detector at different quantum efficiencies, able to accomplish both of these tasks at once, providing with a single measurement an estimate of the transmission losses as well as the photon statistics of the noise present in the exploited quantum channel.We show and discuss the experimental results obtained in the practical implementation of such protocol, with different kinds and levels of noise.

scholarly journals Extension of the Coherence Time by Generating MW Dressed States in a Single NV Centre in Diamond

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
H. Morishita ◽  
T. Tashima ◽  
D. Mima ◽  
H. Kato ◽  
T. Makino ◽  
...  
Keyword(s):  
Coherence Time ◽  
Nitrogen Vacancy ◽  
Sensing Applications ◽  
Dressed States ◽  
Major Interest ◽  
Quantum Sensing ◽  
Order Of Magnitude

Abstract Nitrogen-vacancy (NV) centres in diamond hold promise in quantum sensing applications. A major interest in them is an enhancement of their sensitivity by the extension of the coherence time (T2). In this report, we experimentally generated more than four dressed states in a single NV centre in diamond based on Autler-Townes splitting (ATS). We also observed the extension of the coherence time to T2 ~ 1.5 ms which is more than two orders of magnitude longer than that of the undressed states. As an example of a quantum application using these results we propose a protocol of quantum sensing, which shows more than an order of magnitude enhancement in the sensitivity.

scholarly journals Hamiltonian extensions in quantum metrology

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Julien Mathieu Elias Fraïsse ◽  
Daniel Braun
Keyword(s):  
Hilbert Space ◽  
Phase Shift ◽  
General Framework ◽  
Open Quantum Systems ◽  
Arbitrary Dimension ◽  
Quantum Fisher Information ◽  
Original System ◽  
Quantum Systems ◽  
Quantum Metrology ◽  
Shift Measurement

AbstractWe study very generally towhat extent the uncertainty with which a phase shift can be estimated in quantum metrology can be reduced by extending the Hamiltonian that generates the phase shift to an ancilla system with a Hilbert space of arbitrary dimension, and allowing arbitrary interactions between the original system and the ancilla. Such Hamiltonian extensions provide a general framework for open quantum systems, as well as for “non-linear metrology schemes” that have been investigated over the last few years. We prove that such Hamiltonian extensions cannot improve the sensitivity of the phase shift measurement when considering the quantum Fisher information optimized over input states.

Atomic-Scale Defects in Silicon Carbide for Quantum Sensing Applications

2015 ◽  
Vol 821-823 ◽  
pp. 355-358
Author(s):  
Vladimir Dyakonov ◽  
Hannes Kraus ◽  
V.A. Soltamov ◽  
Franziska Fuchs ◽  
Dmitrij Simin ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Room Temperature ◽  
Atomic Scale ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Crystal Fields ◽  
Quantum Properties ◽  
Sensing Applications ◽  
Quantum Sensing ◽  
Thermal Shift

Atomic-scale defects in silicon carbide exhibit very attractive quantum properties that can be exploited to provide outstanding performance in various sensing applications. Here we provide the results of our studies of the spin-optical properties of the vacancy related defects in SiC. Our studies show that several spin-3/2 defects in silicon carbide crystal are characterized by nearly temperature independent axial crystal fields, which makes these defects very attractive for vector magnetometry. The zero-field splitting of another defect exhibits on contrast a giant thermal shift of 1.1 MHz/K at room temperature, and can be used for temperature sensing applications.

scholarly journals Gold/diamond nanohybrids for quantum sensing applications

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Pei-Chang Tsai ◽  
Oliver Y Chen ◽  
Yan-Kai Tzeng ◽  
Yuen Yung Hui ◽  
Jiun You Guo ◽  
...  
Keyword(s):  
Sensing Applications ◽  
Quantum Sensing

scholarly journals Nuclear spin assisted magnetic field angle sensing

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Ziwei Qiu ◽  
Uri Vool ◽  
Assaf Hamo ◽  
Amir Yacoby
Keyword(s):  
Magnetic Field ◽  
Nuclear Spin ◽  
Coherence Time ◽  
Nitrogen Vacancy ◽  
Sensing Applications ◽  
Field Sensitivity ◽  
Underlying Principle ◽  
Quantum Sensing ◽  
External Signals ◽  
The Magnetic Field

AbstractQuantum sensing exploits the strong sensitivity of quantum systems to measure small external signals. The nitrogen-vacancy (NV) center in diamond is one of the most promising platforms for real-world quantum sensing applications, predominantly used as a magnetometer. However, its magnetic field sensitivity vanishes when a bias magnetic field acts perpendicular to the NV axis. Here, we introduce a different sensing strategy assisted by the nitrogen nuclear spin that uses the entanglement between the electron and nuclear spins to restore the magnetic field sensitivity. This, in turn, allows us to detect small changes in the magnetic field angle relative to the NV axis. Furthermore, based on the same underlying principle, we show that the NV coupling strength to magnetic noise, and hence its coherence time, exhibits a strong asymmetric angle dependence. This allows us to uncover the directional properties of the local magnetic environment and to realize maximal decoupling from anisotropic noise.

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