99 research outputs found
EMN Quantum Strategic Agenda
By 2030 quantum technologies will be ubiquitous, but we are not there yet. Today quantum technologies are being steadily deployed into mainstream marketplaces, with both large and start-up companies beginning to develop and integrate quantum devices into their product lines.
Enhancing confidence in these technologies is essential to their success. This in turn relies on validation and certification, based on internationally agreed standards and metrological traceability, implemented by independent experts. EURAMET Ìs European Metrology Network for Quantum Technologies supports this technological transformation
ETSI GS QKD 016 V1.1.1 - Quantum Key Distribution (QKD); Common Criteria Protection Profile - Pair of Prepare and Measure Quantum Key Distribution Modules
The present document specifies a Protection Profile (PP) for the security evaluation of pairs of Quantum Key
Distribution (QKD) modules under the Common Criteria for Information Technology Security Evaluation (CC v3.1
rev5). The present document is applicable to a pair of QKD modules operating a prepare and measure QKD protocol that can form a complete QKD system when connected by an appropriate point-to-point QKD link. The PP specifies high-level requirements for the physical implementation through to the output of final secret keys
Orientation paper: suggestions to develop research projects in testing and measurements for the upcoming European Partnership on Metrology (EPM) Calls in 2024
The purpose of the document, in agreement with EMN-Q mission to support competitiveness
and innovation of the emerging European Quantum Industry by metrology science, services, and
knowledge transfer, is to identify the priorities related to the development of quantum technologies at the European Level. The EMN-Q is ideally positioned to identify the gaps in measurement capabilities and standards necessary for advancing quantum technologies and to collaboratively develop the solutions necessary to serve the rapidly growing needs of stakeholders. This orientation paper is particularly focused on the Calls Digital Transformation and Normative.
This orientation paper is based on three main elements:
the European Digital Strategy,
the EMN-Q strategic Research Agenda,
the âStandardization Roadmap on Quantum Technologies written by the CEN-CENELEC
Focus Group on Quantum Technologies (FGQT)â (Document FGQT Q04 Release 1 â March 2023
Measurement of Coupling PDC photon sources with single-mode and multimode optical fibers
We investigate the coupling efficiency of parametric downconversion light
(PDC) into single and multi-mode optical fibers as a function of the pump beam
diameter, crystal length and walk-off. We outline two different theoretical
models for the preparation and collection of either single-mode or multi-mode
PDC light (defined by, for instance, multi-mode fibers or apertures,
corresponding to bucket detection). Moreover, we define the mode-matching
collection efficiency, important for realizing a single-photon source based on
PDC output into a well-defined single spatial mode. We also define a multimode
collection efficiency that is useful for single-photon detector calibration
applications.Comment: 13 pages, 12 figure
A MoleculeâBased SingleâPhoton Source Applied in Quantum Radiometry
Single photon sources (SPSs) based on quantum emitters hold promise in
quantum radiometry as metrology standard for photon fluxes at the low light
level. Ideally this requires control over the photon flux in a wide dynamic
range, sub-Poissonian photon statistics and narrow-band emission spectrum. In
this work, a monochromatic single-photon source based on an organic dye
molecule is presented, whose photon flux is traceably measured to be adjustable
between 144 000 and 1320 000 photons per second at a wavelength of (785.6 +/-
0.1) nm, corresponding to an optical radiant flux between 36.5 fW and 334 fW.
The high purity of the single-photon stream is verified, with a second-order
autocorrelation function at zero time delay below 0.1 throughout the whole
range. Featuring an appropriate combination of emission properties, the
molecular SPS shows here application in the calibration of a silicon
Single-Photon Avalanche Detector (SPAD) against a low-noise analog silicon
photodiode traceable to the primary standard for optical radiant flux (i.e. the
cryogenic radiometer). Due to the narrow bandwidth of the source, corrections
to the SPAD detection efficiency arising from the spectral power distribution
are negligible. With this major advantage, the developed device may finally
realize a low-photon-flux standard source for quantum radiometry
Experimental Test of an Event-Based Corpuscular Model Modification as an Alternative to Quantum Mechanics
We present the first experimental test that distinguishes between an
event-based corpuscular model (EBCM) [H. De Raedt et al.: J. Comput. Theor.
Nanosci. 8 (2011) 1052] of the interaction of photons with matter and quantum
mechanics. The test looks at the interference that results as a single photon
passes through a Mach-Zehnder interferometer [H. De Raedt et al.: J. Phys. Soc.
Jpn. 74 (2005) 16]. The experimental results, obtained with a low-noise
single-photon source [G. Brida et al.: Opt. Expr. 19 (2011) 1484], agree with
the predictions of standard quantum mechanics with a reduced of 0.98
and falsify the EBCM with a reduced of greater than 20
Experimental realization of Counterfactual Quantum Cryptography
In counterfactual QKD information is transfered, in a secure way, between
Alice and Bob even when no particle carrying the information is in fact
transmitted between them. In this letter we fully implement the scheme for
counterfactual QKD proposed in [T. Noh, \PRL \textbf{103}, 230501 (2009)],
demonstrating for the first time that information can be transmitted between
two parties without the transmission of a carrier
Optimal estimation of entanglement and discord in two-qubit states
Recently, the fast development of quantum technologies led to the need for
tools allowing the characterization of quantum resources. In particular, the
ability to estimate non-classical aspects, e.g. entanglement and quantum
discord, in two-qubit systems, is relevant to optimise the performance of
quantum information processes. Here we present an experiment in which the
amount of entanglement and discord are measured exploiting different
estimators. Among them, some will prove to be optimal, i.e., able to reach the
ultimate precision bound allowed by quantum mechanics. These estimation
techniques have been tested with a specific family of states ranging from
nearly pure Bell states to completely mixed states. This work represents a
significant step in the development of reliable metrological tools for quantum
technologies
Experimental quantum cryptography scheme based on orthogonal states
Since, in general, non-orthogonal states cannot be cloned, any eavesdropping
attempt in a Quantum Communication scheme using non-orthogonal states as
carriers of information introduces some errors in the transmission, leading to
the possibility of detecting the spy. Usually, orthogonal states are not used
in Quantum Cryptography schemes since they can be faithfully cloned without
altering the transmitted data. Nevertheless, L. Goldberg and L. Vaidman [\prl
75 (1995) 1239] proposed a protocol in which, even if the data exchange is
realized using two orthogonal states, any attempt to eavesdrop is detectable by
the legal users. In this scheme the orthogonal states are superpositions of two
localized wave packets travelling along separate channels. Here we present an
experiment realizing this scheme
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