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  1. Article ; Online: 10-dB squeeze laser tuneable over half a nanometer around 1550 nm.

    Hagemann, Malte / Zander, Jascha / Schönbeck, Axel / Schnabel, Roman

    Optics express

    2024  Volume 32, Issue 5, Page(s) 7954–7958

    Abstract: Lasers for generating monochromatic light beams with sideband spectra in strongly squeezed vacuum states are the basis for aspired optical continuous-variable quantum computers. We have developed a "squeeze laser" that produces 10 dB squeezed vacuum ... ...

    Abstract Lasers for generating monochromatic light beams with sideband spectra in strongly squeezed vacuum states are the basis for aspired optical continuous-variable quantum computers. We have developed a "squeeze laser" that produces 10 dB squeezed vacuum states at a wavelength of 1550 nm, the latter being tunable by 0.5 nm without losing the high squeeze factor. Several identical squeeze lasers can thus be combined to realise wavelength-division multiplexing. Our squeeze laser uses the mature technology of parametric down-conversion in a periodically poled KTP crystal placed in a cavity that resonates both the squeezed field and the second harmonic pump field. Unlike previous realisations, we achieve the double resonance and phase matching by individually optimising and controlling the temperatures of two sections of the crystal body. The wavelength range is currently limited by the tuneability of the 1550 nm master laser.
    Language English
    Publishing date 2024-03-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.507573
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Thesis: Experimentelle Untersuchungen zur Wirkung des Biguanids Metformin auf den Energiestoffwechsel

    Schönbeck, Andreas

    2003  

    Author's details vorgelegt von Andreas Schönbeck
    Language German
    Size V, 97 Bl. : graph. Darst., 30 cm
    Publishing country Germany
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Heidelberg, Univ., Diss., 2003
    HBZ-ID HT013952770
    Database Catalogue ZB MED Medicine, Health

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    Shelf markLoan statusLocation
    2004 E 712 order for loan Magazin

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  3. Article ; Online: Lovsång till den norska fastläkarreformen klingar falskt.

    Schönbeck, Anders

    Lakartidningen

    2016  Volume 113

    Title translation Praise to the Norwegian family physician reform rings false.
    MeSH term(s) General Practice/organization & administration ; Health Care Reform ; Humans ; Norway
    Language Swedish
    Publishing date 2016-05-11
    Publishing country Sweden
    Document type Letter
    ZDB-ID 391010-6
    ISSN 1652-7518 ; 0023-7205
    ISSN (online) 1652-7518
    ISSN 0023-7205
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  4. Article ; Online: Heterodyne laser Doppler vibrometer with squeezed light enhancement.

    Yu, Mengwei / Gewecke, Pascal / Südbeck, Jan / Schönbeck, Axel / Schnabel, Roman / Rembe, Christian

    Optics letters

    2023  Volume 48, Issue 21, Page(s) 5607–5610

    Abstract: An important feature of a heterodyne laser Doppler vibrometer (LDV) is the possibility of measuring an optical path length oscillation at a frequency f at a choosable frequency ... ...

    Abstract An important feature of a heterodyne laser Doppler vibrometer (LDV) is the possibility of measuring an optical path length oscillation at a frequency f at a choosable frequency f
    Language English
    Publishing date 2023-10-31
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.494064
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  5. Article ; Online: 13  dB squeezed vacuum states at 1550  nm from 12  mW external pump power at 775  nm.

    Schönbeck, Axel / Thies, Fabian / Schnabel, Roman

    Optics letters

    2018  Volume 43, Issue 1, Page(s) 110–113

    Abstract: Strongly squeezed light at telecommunication wavelengths is a necessary resource for one-sided device-independent quantum key distribution via fiber networks. Reducing the optical pump power that is required for its generation will advance this quantum ... ...

    Abstract Strongly squeezed light at telecommunication wavelengths is a necessary resource for one-sided device-independent quantum key distribution via fiber networks. Reducing the optical pump power that is required for its generation will advance this quantum technology towards efficient out-of-laboratory operation. Here, we investigate the second-harmonic pump power requirement for parametric generation of continuous-wave squeezed vacuum states at 1550 nm in a state-of-the-art doubly resonant standing-wave periodically poled potassium titanyl phosphate cavity setup. We use coarse adjustment of the Gouy phase via the cavity length, together with temperature fine-tuning, for simultaneously achieving double resonance and (quasi) phase matching, and observe a squeeze factor of 13 dB at 1550 nm from just 12 mW of external pump power at 775 nm. We anticipate that optimizing the cavity coupler reflectivity will reduce the external pump power to 3 mW, without reducing the squeeze factor.
    Language English
    Publishing date 2018-01-01
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.43.000110
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  6. Article ; Online: Sleep Quality and Comfort Reported by Sleep Bruxism Individuals Wearing the Occlusal Splint and Mandibular Advancement Splint: Revisiting Two Crossover Studies.

    Abe, Susumu / Huynh, Nelly T / Romprß, Piere H / de Grandmont, Pierre / Landry-Schönbeck, Anaïs / Landry, Marie-Lou / Kato, Takafumi / Kawano, Fumiaki / Lavigne, Gilles J

    The International journal of prosthodontics

    2023  Volume 36, Issue 2, Page(s) 138–147

    Abstract: Purpose: To assess (1) whether an occlusal splint (OS) or mandibular advancement splint (MAS) allowed better sleep quality and was more comfortable in individuals with sleep bruxism (SB); and (2) the relationship between sleep quality, comfort, and ... ...

    Abstract Purpose: To assess (1) whether an occlusal splint (OS) or mandibular advancement splint (MAS) allowed better sleep quality and was more comfortable in individuals with sleep bruxism (SB); and (2) the relationship between sleep quality, comfort, and reduction in RMMA related to SB.
    Materials and methods: Polysomnographic data from 21 SB subjects (mean ± SD age 25.6 ± 4.5 years) collected in two previous studies were compared. Morning self-reports on sleep quality and comfort of the oral device, polysomnographic data, and RMMA index data from no-device nights were compared to nights using an OS or MAS. The reduction ratio of the RMMA index was calculated for both devices. A responder to the oral device was identified when the RMMA index was less than 2 and when it showed a reduction of at least 50% from the no-device control night.
    Results: Self-reports for sleep quality and comfort of the oral device showed a mild advantage of the OS when compared to the MAS (r
    Conclusions: In the short term, the comfort of the oral device seemed to influence sleep quality in SB individuals. However, despite the slightly higher degree of comfort offered by the OS, the MAS induced a greater effect on the RMMA index. Int J Prosthodont 2022;36:138-147. doi: 10.11607/ijp.7525.
    MeSH term(s) Adult ; Humans ; Young Adult ; Cross-Over Studies ; Mandibular Advancement ; Masticatory Muscles ; Occlusal Splints ; Polysomnography ; Sleep Bruxism/therapy ; Sleep Quality
    Language English
    Publishing date 2023-05-24
    Publishing country United States
    Document type Comparative Study ; Journal Article
    ZDB-ID 645046-5
    ISSN 1942-4426 ; 0893-2174
    ISSN (online) 1942-4426
    ISSN 0893-2174
    DOI 10.11607/ijp.7525
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  7. Article ; Online: Oral appliances reduce masticatory muscle activity-sleep bruxism metrics independently of changes in heart rate variability.

    Abe, Susumu / Huynh, Nelly T / Kato, Takafumi / Rompré, Pierre H / Landry-Schönbeck, Anaïs / Landry, Marie-Lou / de Grandmont, Pierre / Kawano, Fumiaki / Lavigne, Gilles J

    Clinical oral investigations

    2022  Volume 26, Issue 9, Page(s) 5653–5662

    Abstract: Objectives: Sleep bruxism (SB) is associated with physiological activities including sympathetic autonomic system dominance and sleep micro-arousal. While oral appliances (OA) are used to prevent SB harmful effects, the influence of OAs physiological ... ...

    Abstract Objectives: Sleep bruxism (SB) is associated with physiological activities including sympathetic autonomic system dominance and sleep micro-arousal. While oral appliances (OA) are used to prevent SB harmful effects, the influence of OAs physiological mechanisms during sleep is unknown. The aim of this study is to assess whether heart rate variability (HRV) changes, as a marker of autonomic nervous system activity, would be associated with the OA mechanism of action on SB using occlusal splint (OS) and mandibular advancement splint (MAS).
    Materials and methods: A retrospective analysis, from data previously collected in 21 participants with SB (25.6 ± 4.5 years) with polysomnographic recordings, was done. HRV data were compared between a reference night (no-device) and ones during which OS or MAS was used in a crossover study design. Rhythmic masticatory muscle activity (RMMA) index was compared between nights. HRV was evaluated using autoregressive model analysis for three sections: baseline (distance from RMMA), immediately before, and after RMMA period.
    Results: A significant reduction in RMMA index, when wearing OA during sleep, was observed (P < 0.01), but was not associated with HRV parameters change. HRV significantly changed after RMMA onset for nights with OA during non-REM sleep in comparison with baseline (P < 0.02).
    Conclusions: The usage of OAs for SB participants reduced RMMA, but most likely independently of changes in HRV linked to the mechanism associated with SB genesis.
    Clinical relevance: Wearing OA seems to reduce grinding noise and protect from dental injuries but does not seem to influence SB genesis.
    MeSH term(s) Cross-Over Studies ; Heart Rate ; Humans ; Masticatory Muscles ; Polysomnography ; Retrospective Studies ; Sleep Bruxism/complications
    Language English
    Publishing date 2022-05-10
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1364490-7
    ISSN 1436-3771 ; 1432-6981
    ISSN (online) 1436-3771
    ISSN 1432-6981
    DOI 10.1007/s00784-022-04520-y
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    Zs.A 4788: Show issues Location:
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  8. Article ; Online: Quantum non-Gaussianity of frequency up-converted single photons.

    Baune, Christoph / Schönbeck, Axel / Samblowski, Aiko / Fiurášek, Jaromír / Schnabel, Roman

    Optics express

    2014  Volume 22, Issue 19, Page(s) 22808–22816

    Abstract: Nonclassical states of light are an important resource in today's quantum communication and metrology protocols. Quantum up-conversion of nonclassical states is a promising approach to overcome frequency differences between disparate subsystems within a ... ...

    Abstract Nonclassical states of light are an important resource in today's quantum communication and metrology protocols. Quantum up-conversion of nonclassical states is a promising approach to overcome frequency differences between disparate subsystems within a quantum information network. Here, we present the generation of heralded narrowband single photons at 1550 nm via cavity enhanced spontaneous parametric down-conversion (SPDC) and their subsequent up-conversion to 532 nm. Quantum non-Gaussianity (QNG), which is an important feature for applications in quantum information science, was experimentally certified for the first time in frequency up-converted states.
    MeSH term(s) Equipment Design ; Light ; Photons ; Quantum Theory ; Refractometry/instrumentation
    Language English
    Publishing date 2014-09-22
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.22.022808
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  9. Article ; Online: Strongly squeezed states at 532 nm based on frequency up-conversion.

    Baune, Christoph / Gniesmer, Jan / Schönbeck, Axel / Vollmer, Christina E / Fiurášek, Jaromír / Schnabel, Roman

    Optics express

    2015  Volume 23, Issue 12, Page(s) 16035–16041

    Abstract: Quantum metrology utilizes nonclassical states to improve the precision of measurement devices. In this context, strongly squeezed vacuum states of light have proven to be a useful resource. They are typically produced by spontaneous parametric down- ... ...

    Abstract Quantum metrology utilizes nonclassical states to improve the precision of measurement devices. In this context, strongly squeezed vacuum states of light have proven to be a useful resource. They are typically produced by spontaneous parametric down-conversion, but have not been generated at shorter wavelengths so far, as suitable nonlinear materials do not exist. Here, we report on the generation of strongly squeezed vacuum states at 532 nm with 5.5 dB noise suppression by means of frequency up-conversion from the telecommunication wavelength of 1550 nm. The up-converted states are employed in a model Mach-Zehnder interferometer to illustrate their use in quantum metrology.
    Language English
    Publishing date 2015-06-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.23.016035
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  10. Article ; Online: Evaluating patient experiences in decentralised acute care using the Picker Patient Experience Questionnaire; methodological and clinical findings.

    Leonardsen, Ann-Chatrin Linqvist / Grøndahl, Vigdis Abrahamsen / Ghanima, Waleed / Storeheier, Espen / Schönbeck, Anders / Løken, Thor-Asbjørn / Bakken, Nina Carine Mikkelsen / Letting, Guro Steine / Holst, Réné / Jelsness-Jørgensen, Lars-Petter

    BMC health services research

    2017  Volume 17, Issue 1, Page(s) 685

    Abstract: Background: Decentralised acute care services have, through the establishment of municipality acute wards (MAWs), been launched in Norway. The aim is to provide treatment for patients who otherwise would need hospitalisation. Currently there is a lack ... ...

    Abstract Background: Decentralised acute care services have, through the establishment of municipality acute wards (MAWs), been launched in Norway. The aim is to provide treatment for patients who otherwise would need hospitalisation. Currently there is a lack of studies investigating patient experiences in such services. The aims of this study were therefore to a) translate and validate the Picker Patient Experience Questionnaire (PPE-15) in Norwegian, and b) assess patient experiences in decentralised acute care, and potential factors associated with these experiences.
    Methods: Patients were recruited from five municipal acute wards in southeastern Norway during the period from June 2014 to June 2015. Data on socio-demographics, length of stay and comorbidity (Charlson comorbidity index (CCI)) were collected. Patients completed the Picker Patient Experience Questionnaire (PPE-15) and the EuroQOL 5-dimension, 3-level version. Convergent validity of the PPE-15 was assessed by correlation of items in PPE-15 and the Nordic Patient Experience Questionnaire (NORPEQ). A retest of the PPE-15 was performed in a subgroup of patients approximately 3 weeks after baseline assessment. Test-retest agreement was assessed with Cohens' unweighted Kappa.
    Results: A total of 479 patients responded, median age 78.0 years and 41.8% men. A total of 68 patients participated in the retest. Testing of convergent validity revealed an overall weak to moderate correlation. Kappa statistics showed from fair to good test-retest agreement. Most problems were related to continuity and transition, while fewest problems were related to respect for patient preferences. A higher Charlson comorbidity score was the only variable that was negatively associated with patient experience.
    Conclusion: Patients reported problems in several items of the PPE-15 after discharge from decentralised acute wards. The findings from the current study may be helpful for planning ways to improve quality of care, e.g., by providing feedback to healthcare personnel or by using patient experience as a quality indicator.
    Language English
    Publishing date 2017-09-29
    Publishing country England
    Document type Journal Article
    ISSN 1472-6963
    ISSN (online) 1472-6963
    DOI 10.1186/s12913-017-2614-4
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