المؤلفون: Onorati, E., Kitzinger, J., Helsen, J., Ioannou, M., Werner, A. H., Roth, I., Eisert, J.

مصطلحات موضوعية: Quantum Physics, Condensed Matter - Other Condensed Matter, Mathematical Physics

الوصف: Randomized measurements are increasingly appreciated as powerful tools to estimate properties of quantum systems, e.g., in the characterization of hybrid classical-quantum computation. On many platforms they constitute natively accessible measurements, serving as the building block of prominent schemes like shadow estimation. In the real world, however, the implementation of the random gates at the core of these schemes is susceptible to various sources of noise and imperfections, strongly limiting the applicability of protocols. To attenuate the impact of this shortcoming, in this work we introduce an error-mitigated method of randomized measurements, giving rise to a robust shadow estimation procedure. On the practical side, we show that error mitigation and shadow estimation can be carried out using the same session of quantum experiments, hence ensuring that we can address and mitigate the noise affecting the randomization measurements. Mathematically, we develop a picture derived from Fourier-transforms to connect randomized benchmarking and shadow estimation. We prove rigorous performance guarantees and show the functioning using comprehensive numerics. More conceptually, we demonstrate that, if properly used, easily accessible data from randomized benchmarking schemes already provide such valuable diagnostic information to inform about the noise dynamics and to assist in quantum learning procedures.
Comment: 6+20 pages, 6 figures

الوصول الحر: http://arxiv.org/abs/2403.04751Test

المؤلفون: Ilioudi, M, Lindner, P, Ali, L, Wallstroem, S, Thunstroem, AO, Ioannou, M, Anving, N, Johansson, V, Hamilton, W, Falk, O, Steingrimsson, S

المصدر: Journal of medical Internet research. 25:e42365

مصطلحات موضوعية: Medicin och hälsovetenskap

الوصول الحر: http://kipublications.ki.se/Default.aspx?queryparsed=id:153107437Test

المؤلفون: Helsen, J., Ioannou, M., Kitzinger, J., Onorati, E., Werner, A. H., Eisert, J., Roth, I.

المصدر: Nature Comm. 14, 5039 (2023)

مصطلحات موضوعية: Quantum Physics

الوصف: With quantum computing devices increasing in scale and complexity, there is a growing need for tools that obtain precise diagnostic information about quantum operations. However, current quantum devices are only capable of short unstructured gate sequences followed by native measurements. We accept this limitation and turn it into a new paradigm for characterizing quantum gate-sets. A single experiment - random sequence estimation - solves a wealth of estimation problems, with all complexity moved to classical post-processing. We derive robust channel variants of shadow estimation with close-to-optimal performance guarantees and use these as a primitive for partial, compressive and full process tomography as well as the learning of Pauli noise. We discuss applications to the quantum gate engineering cycle, and propose novel methods for the optimization of quantum gates and diagnosing cross-talk.
Comment: 10+17 pages, 3 figures, replaced with final version

الوصول الحر: http://arxiv.org/abs/2110.13178Test

المؤلفون: Carpenter, G., Carvalho, N., Guillén, J., Andersen, J.L., Prellezo, R., Villasante, S., Mravlje, E.A., Berkenhagen, J., Brigaudeau, C., Burke, B., Calvo Santos, A., Cano, S., Contini, F., Da-Rocha, J.-M., Davidjuka, I., Fernández Martínez, F.M., Fontaneda-López, I., Gambino, M., Garcia Caballero, E., Guyader, O., Herring, J., Hoekstra, G., Ioannou, M., Jackson, E., Jung, A., Kazlauskas, E., Keatinge, M., Kuzebski, E., Leonardi, S., Le Grand, C., Lees, J., Mancebo-Robledo, C.M., Minne, M.-D., Mol, A., Moran Quintana, M., Nicheva, S., Pokki, H., Ramos Do Ó, J., Rodríguez, A., Sabatella, R.F., Sciberras, A., Souffez, A., Stroie, C., Swahnberg, H., Tzouramani, I., Valiente Viana, M., Verlé, K., Virtanen, J., Vukov, I., Zhelev, K.

المصدر: %3Ci%3EAquat.+Living+Resour.+36%28SI%29%3C%2Fi%3E%3A+2.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1051%2Falr%2F2022022%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1051%2Falr%2F2022022%3C%2Fa%3E

الوصف: The COVID-19 outbreak and subsequent public health interventions have depressed demand and disrupted supply chains for many fishing businesses. This paper provides an analysis of the COVID-19 impacts on the profitability of the EU fishing fleets. Nowcasting techniques were used to estimate the impact of the COVID-19 pandemic on the economic performance for the EU fishing fleet in 2020 and 2021. Our results show that the economic impact of COVID-19 on this sector was smaller than initially expected and overall profits remained positive. This was in part due to low fuel prices that reduced operating costs of fishing, and the early response from governments to support the sector. The results vary by fishing fleet, revealing that small-scale fleets and the fleets in the Mediterranean and Black seas have been more impacted than large-scale fleets and the fleets in the Northeast Atlantic.

وصف الملف: application/pdf

العلاقة: info:eu-repo/semantics/altIdentifier/wos/000946069500003; https://www.vliz.be/imisdocs/publications/389060.pdfTest

الإتاحة: https://doi.org/10.1051/alr/2022022Test
https://www.vliz.be/imisdocs/publications/389060.pdfTest

المؤلفون: Helsen, J., Ioannou, M., Kitzinger, J., Onorati, E., Werner, A. H., Eisert, J., Roth, I.

المصدر: Helsen , J , Ioannou , M , Kitzinger , J , Onorati , E , Werner , A H , Eisert , J & Roth , I 2023 , ' Shadow estimation of gate-set properties from random sequences ' , Nature Communications , vol. 14 , no. 1 , 5039 . https://doi.org/10.1038/s41467-023-39382-9Test

الوصف: With quantum computing devices increasing in scale and complexity, there is a growing need for tools that obtain precise diagnostic information about quantum operations. However, current quantum devices are only capable of short unstructured gate sequences followed by native measurements. We accept this limitation and turn it into a new paradigm for characterizing quantum gate-sets. A single experiment—random sequence estimation—solves a wealth of estimation problems, with all complexity moved to classical post-processing. We derive robust channel variants of shadow estimation with close-to-optimal performance guarantees and use these as a primitive for partial, compressive and full process tomography as well as the learning of Pauli noise. We discuss applications to the quantum gate engineering cycle, and propose novel methods for the optimization of quantum gates and diagnosing cross-talk. © 2023, Springer Nature Limited.

وصف الملف: application/pdf

الإتاحة: https://doi.org/10.1038/s41467-023-39382-9Test
https://curis.ku.dk/portal/da/publications/shadow-estimation-of-gateset-properties-from-random-sequencesTest(ef0c6377-80db-450e-a630-15fc53e98e97).html
https://curis.ku.dk/ws/files/365707100/s41467_023_39382_9.pdfTest

المؤلفون: Kolokotroni, O, Ioannou, M, Hadjigeorgiou, E, Nicolaou, C, Middleton, N

المصدر: European Journal of Public Health ; volume 33, issue Supplement_2 ; ISSN 1101-1262 1464-360X

مصطلحات موضوعية: Public Health, Environmental and Occupational Health

الوصف: Issue The high caesarean section (C/S) rate in Cyprus (>60%) led to the formation of a National Committee to address this Public Health priority. Among WHO recommendations for C/S reduction are midwifery-led educational interventions; yet, medicalization of birth in Cyprus is curtailing the autonomous role of midwives. Description of problem While midwives could “make every contact count” during routine appointments, antenatal education (AE) is reduced to a formal activity within the antenatal class space with documented low attendance. This formative research mapped barriers to the educational role of Cypriot midwives guided by behaviour theory. A context-specific understanding is needed to shape an appropriate intervention and promote a common understanding among stakeholders. Results One in three midwives islandwide (N = 119, response: 34%) rated 83 determinants (from 1=more to 6=less problematic), guided by the Theoretical Domains Framework (TDF). “Beliefs about AE importance” (M = 5.57, SD = 0.96) and “Professional role” (M = 5.58, SD = 0.57) received the highest scores. Lack of organizational resources (M = 3.39, SD = 0.97), institutional and inter-professional support (M = 3.77, SD = 1.4) and acceptance (M = 4.25, SD = 0.85) were identified as problematic. While perceived capabilities and intentions were rated favourably, achieving “Goals” was difficult, mainly due to competing priorities (M = 3.86, SD = 0.84). Self-efficacy and behavioural control were lower among less experienced midwives (p < 0.01) and in the private sector (p = 0.08), which accounts for >70% of births. Lessons Beyond the antenatal class, AE is a ‘bad fit’ with routine practice. The phenomenon pertains to organizational arrangements but also norms and perceptions of other providers and service users. While current Healthcare reforms present prospects in re-defining the role of midwives, the educational role is not adequately supported or promoted given the limited number of visits and reimbursement ...

الإتاحة: https://doi.org/10.1093/eurpub/ckad160.1532Test
https://academic.oup.com/eurpub/article-pdf/33/Supplement_2/ckad160.1532/52415721/ckad160.1532.pdfTest

المؤلفون: Vlachostergios, P., Papathanassiou, M., Anagnostou, M., Tamposis, I., Mitrakas, L., Zachos, I., Thodou, E., Ioannou, M., Koukoulis, G., Samara, M., Tzortzis, V.

المصدر: European Urology Open Science ; volume 57, page S253 ; ISSN 2666-1683

مصطلحات موضوعية: Urology

الإتاحة: https://doi.org/10.1016/s2666-1683Test(23)01472-6
https://api.elsevier.com/content/article/PII:S2666168323014726?httpAccept=text/xmlTest
https://api.elsevier.com/content/article/PII:S2666168323014726?httpAccept=text/plainTest

المؤلفون: Bernier, N. R., Tóth, L. D., Koottandavida, A., Ioannou, M., Malz, D., Nunnenkamp, A., Feofanov, A. K., Kippenberg, T. J.

المصدر: Nature Communications 8, 604 (2017)

مصطلحات موضوعية: Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Superconductivity

الوصف: Devices that achieve nonreciprocal microwave transmission are ubiquitous in radar and radio-frequency communication systems, and commonly rely on magnetically biased ferrite materials. Such devices are also indispensable in the readout chains of superconducting quantum circuits as they protect sensitive quantum systems from the noise emitted by readout electronics. Since ferrite-based nonreciprocal devices are bulky, lossy, and require large magnetic fields, there has been significant interest in magnetic-field-free on-chip alternatives, such as those recently implemented using Josephson junctions. Here we realise reconfigurable nonreciprocal transmission between two microwave modes using purely optomechanical interactions in a superconducting electromechanical circuit. We analyse the transmission as well as the noise properties of this nonreciprocal circuit. The scheme relies on the interference in two mechanical modes that mediate coupling between microwave cavities. Finally, we show how quantum-limited circulators can be realized with the same principle. The technology can be built on-chip without any external magnetic field, and is hence fully compatible with superconducting quantum circuits. All-optomechanically-mediated nonreciprocity demonstrated here can also be extended to implement directional amplifiers, and it forms the basis towards realising topological states of light and sound.
Comment: 8 pages of main text + 7 pages of supplementary information

الوصول الحر: http://arxiv.org/abs/1612.08223Test

المؤلفون: Deshpande, A., Mehta, A., Vincent, T., Quesada, N., Hinsche, M., Ioannou, M., Madsen, L., Lavoie, J., Qi, H., Eisert, J., Hangleiter, D., Fefferman, B., Dhand, I.

مصطلحات موضوعية: quantum computational advantage QCA, photonics, Gaussian boson sampling GBS

الوصف: Photonics is a promising platform for demonstrating a quantum computational advantage QCA by outperforming the most powerful classical supercomputers on a well defined computational task. Despite this promise, existing proposals and demonstrations face challenges. Experimentally, current implementations of Gaussian boson sampling GBS lack programmability or have prohibitive loss rates. Theoretically, there is a comparative lack of rigorous evidence for the classical hardness of GBS. In this work, we make progress in improving both the theoretical evidence and experimental prospects. We provide evidence for the hardness of GBS, comparable to the strongest theoretical proposals for QCA. We also propose a QCA architecture we call high dimensional GBS, which is programmable and can be implemented with low loss using few optical components. We show that particular algorithms for simulating GBS are outperformed by high dimensional GBS experiments at modest system sizes. This work thus opens the path to demonstrating QCA with programmable photonic processors

وصف الملف: application/pdf

العلاقة: http://www.helmholtz-berlin.de/pubbin/oai_publication?VT=1&ID=109165Test

الإتاحة: https://doi.org/10.1126/sciadv.abi7894Test
http://www.helmholtz-berlin.de/pubbin/oai_publication?VT=1&ID=109165Test

المؤلفون: Vageli, D., Doukas, P. G., Zacharouli, K., Kakanis, V., Strataki, M., Zioga, A., Skoulakis, C., Koukoulis, G., Ioannou, M.

المساهمون: University of Thessaly Central Library

المصدر: Head and Neck Pathology ; volume 17, issue 2, page 331-338 ; ISSN 1936-0568

مصطلحات موضوعية: Oncology, Otorhinolaryngology, Pathology and Forensic Medicine

الوصف: Background Squamous cell carcinoma of the lip (LSCC) and oral cavity can be life-threatening if not diagnosed early. Precancerous lesions like actinic cheilitis (AC), can transform into LSCC. Laminin is a fundamental component for basement membrane (BM) and its integrity may prevent neoplastic invasion. Therefore, laminin immunostaining of BM may be useful in identifying early invasion in actinic cheilitis and thus in the differential diagnosis between AC and invasive LSCC or high-grade epithelial dysplasia (ED). Materials and methods Biopsies from 46 patients with oral lesions were histologically analyzed and immunohistochemically stained for laminin-1. Results AC was diagnosed in 34 patients and LSCC in 12 patients, including 3 patients with AC and concomitant high-grade ED/in situ carcinoma. Laminin-1 immunostaining revealed intense and linear expression of the BM in AC with low-grade ED. Loss of laminin expression was observed in LSCC. Intracellular laminin expression in parabasal cells was noted in AC with high-grade ED/in situ carcinoma. Conclusion Laminin immunostaining could be useful in identifying AC cases suspected of early invasion. It could also contribute to the histopathological differential diagnosis between AC with low- and high-grade ED and between AC and invasive LSCC. The findings of this study provide new insights into the mechanism involved in the progression process of AC into LSCC, encouraging preclinical studies that may document the stochastic role of laminin in this process.

الإتاحة: https://doi.org/10.1007/s12105-022-01504-yTest