Publications

Semi-popular and views
  • Roman Schnabel, Gerhard Heinzel, Harald Lück, Benno Willke, and Karsten Danzmann, Wellen aus dem Rauschen fischen, Physik Journal, Oktober, 33 (2009)
  • Roman Schnabel, Helge Müller-Ebhardt, and Henning Rehbein, Verschränkte Spiegel, Physik in Unserer Zeit 39, 234 (2008).
  • Roman Schnabel, Verschränkung zweier Spiegel, Spektrum der Wissenschaft, Juni (2008).
  • Roman Schnabel, Gravitational wave detectors: Squeezing up the sensitivity, Nature Physics 4, 440 (2008), News and Views.
Publications in refereed journals

    2014
    • A. Samblowski, C. E. Vollmer, C. Baune, J. Fiurášek, and R. Schnabel, Weak-signal conversion from 1550 to 532 nm with 84% efficiency, Optics Letters 39, 2979 (2014).
    • C. E. Vollmer, C. Baune, A. Samblowski, T. Eberle, V. Händchen, J. Fiurášek, and R. Schnabel, Quantum Up-Conversion of Squeezed Vacuum States from 1550 to 532 nm, Phys. Rev. Lett. 112, 073602 (2014).
    2013
    • C. Vollmer, D. Schulze, T. Eberle, V. Händchen, J. Fiurasek, R. Schnabel,  Experimental Entanglement Distribution by Separable States. Phys. Rev. Lett. 111, 230505 (2013).
    • S. Tarabrin, H. Kaufer, F. Y. Khalili, R. Schnabel, K. Hammerer, Anomalous dynamic backaction in interferometers, Phys. Rev. A 88, 023809 (2013).
    • A. Khalaidovski, J. Steinlechner, R. Schnabel, Indication for dominating surface absorption in crystalline silicon test masses at 1550 nm, Class. Quantum Grav. 30 (2013) 165001
    • S. Steinlechner, J. Bauchrowitz, M. Meinders, H. Müller-Ebhardt, K. Danzmann, R. Schnabel, Quantum-dense metrology, Nat. Photonics, doi:10.1038/ nphoton.2013.150 (2013).
    • S. Ast, M. Mehmet, R. Schnabel, High-bandwidth squeezed light at 1550 nm from a compact monolithic PPKTP cavity, Opt. Express 21, 13572 (2013).
    • T. Eberle, V. Händchen, J. Duhme, T. Franz, R. Schnabel, R. Werner, Gaussian Entanglement for Quantum Key Distribution from a Single-Mode Squeezing Source, New J. Phys. 15, 053049 (2013).
    • C. Gräf, A. Thüring, H. Vahlbruch, K. Danzmann, R. Schnabel, Length sensing and control of a Michelson interferometer with Power Recycling and Twin Signal Recycling cavities, Opt. Express 21, 5287 (2013)
    • D. Brown, D. Friedrich, F. Brückner, L. Carbone, R. Schnabel, A. Freise, Invariance of waveguide grating mirrors to lateral displacement phase shifts, Opt. Lett. 38, 1844 (2013)
    • H. Grote, K. Danzmann, K. L. Dooley, R. Schnabel, J. Slutsky, H. Vahlbruch,   First Long-Term Application of Squeezed States of Light in a Gravitational-Wave Observatory, Phys. Rev. Lett. 110, 181101 (2013).
    • T. Eberle, V. Händchen, R. Schnabel, Stable control of 10 dB two-mode squeezed vacuum states of light, Opt. Exp. 21, 11546 (2013).
    • J. Steinlechner, C. Krüger, N. Lastzka, S. Steinlechner, A. Khalaidovski, R. Schnabel, Optical absorption measurements on crystalline silicon test masses at 1550 nm, Class. Quantum Grav. 30, 095007 (2013).
    • S. Steinlechner, J. Bauchrowitz, T. Eberle, and R. Schnabel, Strong EPR-steering with unconditional entangled states,Phys. Rev. A 87, 022104 (2013).
    • J. Steinlechner, S. Ast, C. Krüger, A. Pal Singh, T. Eberle, V. Händchen, R. Schnabel, Absorption Measurements of Periodically Poled Potassium Titanyl Phosphate (PPKTP) at 775 nm and 1550 nm, Sensors, 13(1), 565-573 (2013).
    2012
    • M. S. Stefszky, C. M. Mow-Lowry, S. S. Y. Chua, D. A. Shaddock, B. C. Buchler, H. Vahlbruch, A. Khalaidovski, R. Schnabel, P. K. Lam, and D. E. McClelland, Balanced Homodyne Detection of Optical Quantum States at Audio-Band Frequencies and Below, Class. Quantum Grav. 29, 145015 (2012).
    • Stefan Ast, Aiko Samblowski, Moritz Mehmet, Sebastian Steinlechner, Tobias Eberle, and Roman Schnabel, Continuous-wave non-classical light with GHz squeezing bandwidth, Opt. Lett., Opt. Lett. 37, 2367 (2012).
    • T. Westphal, D. Friedrich, H. Kaufer, K. Yamamoto, S. Goßler, H. Müller-Ebhardt, S. L. Danilishin, F. Ya. Khalili, K. Danzmann, and R. Schnabel, Interferometer readout-noise below the Standard Quantum Limit of a membrane, Phys. Rev. A 85, 063806 (2012).
    • A. Khalaidovski, H. Vahlbruch, N. Lastzka, C. Gräf, K. Danzmann, H. Grote and R. Schnabel, Long-term stable squeezed vacuum state of light for gravitational wave detectors, Class. Quantum Grav. 29, 075001 (2012).
    • J. Steinlechner, L. Jensen, C. Krüger, N. Lastzka, S. Steinlechner, and R. Schnabel, The photo-thermal self-phase modulation technique for absorption measurements on high-reflective coatings, Applied Optics 51, 1156-1161 (2012).
    2011
    • M. Mehmet, S. Ast, T. Eberle, S. Steinlechner, H. Vahlbruch, and R. Schnabel, Squeezed light at 1550nm with a quantum noise reduction of 12.3 dB, Opt. Express 19, 25764 (2011).
    • J. DiGuglielmo, A. Samblowski, B. Hage, C. Pineda, J. Eisert, and R. Schnabel, Experimental unconditional preparation and detection of a continuous bound entangled state of light, Phys. Rev. Lett. 107, 240503 (2011).
    • A. Xuereb, R. Schnabel, K. Hammerer, Dissipative Optomechanics in a Michelson-Sagnac Interferometer, Phys. Rev Lett. 107, 213604 (2011).
    • The LIGO Scientific Collaboration (J. Abadie et al.), A gravitational wave observatory operating beyond the quantum shot-noise limit, Nature Physics 7, 962 (2011), doi:10.1038/nphys2083
    • T. Kiesel, W. Vogel, B. Hage, and R. Schnabel, Direct Sampling of Negative Quasiprobabilities of a Squeezed State, Phys. Rev. Lett. 107, 113604 (2011).
    • A. Thüring, and R. Schnabel, The critical Kerr non-linear optical cavity in the presence of internal loss and driving noise. Phys. Rev. A 84, 033839  (2011).
    • S. Ast, R. Moghadas Nia, A. Schönbeck, N. Lastzka, J. Steinlechner, T. Eberle, M. Mehmet, S. Steinlechner, and R. Schnabel, High-efficiency frequency doubling of continuous-wave laser light, Opt. Lett. 36, 3467 (2011), arXiv:1105.5909.
    • D. Friedrich, T. Westphal, H. Kaufer, K. Yamamoto, F. Y. Khalili, S. L. Danilishin, A. Sawadsky, S. Goßler, K. Danzmann, and R. Schnabel, Laser interferometry with translucent and absorbing mechanical oscillators, New J. Phys., 13, 093017, arXiv:1104.3251.
    • D. Friedrich, B. W. Barr, F. Brückner, S. Hild, J. Nelson, J. Macarthur, M. V. Plissi, M. P. Edgar, S. H. Huttner, B. Sorazu, S. Kroker, M. Britzger, E.-B. Kley, K. Danzmann, A. Tünnermann, K. A. Strain, and R. Schnabel, Waveguide grating mirror in a fully suspended 10 meter Fabry-Perot cavity, Opt. Exp. 19, 14955 (2011).
    • M. Britzger, D. Friedrich, S. Kroker, F. Brückner, O. Burmeister, E.-B. Kley, A. Tünnermann, K. Danzmann, and R. Schnabel, Diffractively coupled Fabry-Perot resonator with power-recycling, Opt. Exp. 19, 14964 (2011).
    • M. Britzger, D. Friedrich, S. Kroker, f. Brückner, O. Burmeister, E.-B. Kley, A. Tünnermann, K. Danzmann, and R. Schnabel, Pound-Drever-Hall error signals for the length control of 3-port-grating-coupled cavities, Appl. Opt. 50, 4340 (2011).
    • B. W. Barr, M. P. Edgar, J. Nelson, M. V. Plissi, S. H. Huttner, B. Sorazu, K. A. Strain, O. Burmeister, M. Britzger, D. Friedrich, R. Schnabel, K. Danzmann, J. Hallam, A. Freise, T. Clausnitzer, F. Brückner, E.-B. Kley, and A. Tünnermann, Translational, rotational and vibrational coupling into phase in diffractively-coupled optical cavities, Opt. Lett. 36, 2746 (2011).
    • D. Friedrich, B. W. Barr, F. Brückner, S. Hild, J. Nelson, J. Macarthur, M. V. Plissi, M. P. Edgar, S. H. Huttner, B. Sorazu, S. Kroker, M. Britzger, E.-B. Kley, K. Danzmann, A. Tünnermann, K. A. Strain, and R. Schnabel, Waveguide grating mirror in a fully suspended 10 meter Fabry-Perot cavity, Optics Express 19, 14955 (2011).
    • T. Kiesel, W. Vogel, B. Hage, and R. Schnabel, Entangled Qubits in a non-Gaussian Quantum State, Phys. Rev. A 83, 062319 (2011).
    • T. Eberle, V. Händchen, J. Duhme, T. Franz, R. F. Werner, and R. Schnabel, Strong Einstein-Podolsky-Rosen entanglement from a single squeezed source, Phys. Rev. A 83, 052329 (2011).
    • D. E. McClelland, N. Mavalvala, Y. Chen, and R. Schnabel, Advanced interferometry, quantum optics and optomechanics in gravitational wave detectors, Laser Photonics Rev. 5, 677-696 (2011),doi: 10.1002/lpor.201000034.
    • N. Mavalvala, D. E. McClelland, G. Müller, D. H. Reitze, R. Schnabel, and B. Willke, Lasers and Optics: Looking Toward Third Generation Gravitational-Wave Detectors, General Relativity and Gravitation 43:569–592 doi: 10.1007/s10714-010-1023-3 (2011).
    2010
    • B. Hage, A. Samblowski, J. DiGuglielmo, J. Fiurášek, and R. Schnabel, Iterative Entanglement Distillation: Approaching full Elimination of Decoherence, Phys. Rev. Lett. 105, 230502 (2010).
    • R. Schnabel et al., Building blocks for future detectors: Silicon test masses and 1550 nm laser light, Journal of Physics: Conference Series 228, 012029 (2010).
    • M. Punturo et al., The third generation of gravitational wave observatories and their science reach, Class. Quantum Grav. 084007 (2010).
    • R. Schnabel, N. Mavalvala, D. E. McClelland, and P. K. Lam, Quantum metrology for gravitational wave astronomy. Nat. Commun. 1:121 doi: 10.1038/ncomms1122 (2010).
    • T. Eberle, S. Steinlechner, J. Bauchrowitz, V. Händchen, H. Vahlbruch, M.Mehmet, H. Müller-Ebhardt and R. Schnabel, Quantum enhancement of the zero-area Sagnac interferometer topology for gravitational wave detection, Phys. Rev. Lett. 104, 251102 (2010).
    • B. Hage, A. Samblowski, and R. Schnabel, Towards Einstein-Podolsky-Rosen quantum channel multiplexing, Phys. Rev. A 81, 062301 (2010), selected as a research highlight in Nature Photonics 4, 500 (2010).
    • M. Mehmet, T. Eberle, S. Steinlechner, H. Vahlbruch and R. Schnabel, Demonstration of a quantum-enhanced fiber Sagnac interferometer, Opt. Lett. 35, 1665 (2010).
    • M. P. Edgar, B. W. Barr, J. Nelson, M. V. Plissi, K. A. Strain, O. Burmeister, M. Britzger, K. Danzmann, R. Schnabel, T. Clausnitzer, F. Brückner, E.-B. Kley, and A. Tünnermann, Experimental demonstration of a suspended diffractively coupled optical cavity, Class. Quantum Grav. 27, 084029 (2010).
    • M. Punturo et al., The third generation of gravitational wave observatories and their science reach, Class. Quantum Grav. 27, 084007 (2010).
    • S. Goßler et al., The AEI 10 m prototype interferometer, Class. Quantum Grav. 27, 084023 (2010).
    • O. Burmeister, M. Britzger, A. Thüring, D. Friedrich, F. Brückner, K. Danzmann, and R. Schnabel, All-reflective coupling of two optical cavities with 3-port diffraction gratings, Optics Express 18, 9119 (2010).
    • F. Brückner, D. Friedrich, T. Clausnitzer, M. Britzger, O. Burmeister, K. Danzmann, E.-B. Kley, A. Tünnermann, and R. Schnabel, Realization of a monolithic high-reflectivity cavity mirror from a single silicon crystal, Phys. Rev. Lett. 104, 163903 (2010).
    • Henning Vahlbruch, Alexander Khalaidovski, Nico Lastzka, Christian Gräf, Karsten Danzmann, and Roman Schnabel, The GEO600 squeezed light source, Class. Quantum Grav. 27, 084027 (2010).
    • K. Yamamoto, D. Friedrich, T. Westphal, S. Goßler, K. Danzmann, Kentaro Somiya, Stefan L. Danilishin, and R. Schnabel, Quantum noise of a Michelson-Sagnac interferometer with translucent mechanical oscillator, Phys. Rev. A 81, 033849 (2010)
    • M. Mehmet, H. Vahlbruch, N. Lastka, K. Danzmann, and R. Schnabel, Observation of squeezed states with strong photon-number oscillations, Phys. Rev. A 81, 013814 (2010).
    2009
    • F. Brückner, D. Friedrich, M. Britzger, T. Clausnitzer, O. Burmeister, E.-B. Kley, K. Danzmann, A. Tünnermann, and R. Schnabel, Encapsulated subwavelength grating as a quasi-monolithic resonant reflector, Opt. Exp. 17, 24334 (2009).
    • Alexander Khalaidovski, André Thüring, Henning Rehbein, Nico Lastzka, Benno Willke, Karsten Danzmann, and R. Schnabel, Strong reduction of laser power noise by means of a Kerr nonlinear cavity, Phys. Rev. A 80, 053801 (2009).
    • M. P. Edgar, B. W. Barr, J. Nelson, M. V. Plissi, K. A. Strain, O. Burmeister, M. Britzger, K. Danzmann, R. Schnabel, T. Clausnitzer, F. Brückner, E.-B. Kley, and A. Tünnermann, Experimental demonstration of a suspended diffractively coupled optical cavity, Opt. Lett. 34, 3184 (2009).
    • J. Hallam, S. Chelkowski, A. Freise, S. Hild, B. Barr, K. A. Strain, O. Burmeister, and R. Schnabel, Coupling of lateral grating displacement to the output ports of a diffractive Fabry–Perot cavity, J. Opt. A: Pure Appl. Opt. 11, 085502 (2009).
    • Frank Brückner, Daniel Friedrich, Tina Clausnitzer, Oliver Burmeister, Michael Britzger, Ernst-Bernhard Kley, Karsten Danzmann, Andreas Tünnermann, and Roman Schnabel, Demonstration of a cavity coupler based on a resonant waveguide grating, Optics Express 17, 163 (2009).
    • M. Mehmet, S. Steinlechner, T. Eberle, H. Vahlbruch, A. Thüring, K. Danzmann, and R. Schnabel, Observation of cw squeezed light at 1550 nm, Opt. Lett. 34, 1060 (2009).
    • André Thüring, Christian Gräf, Henning Vahlbruch, Moritz Mehmet, Karsten Danzmann, and Roman Schnabel, Broadband squeezing of quantum noise in a
      Michelson interferometer withTwin-Signal-Recycling, Opt. Lett.  34, 824 (2009).
    2008
    • Henning Rehbein, Helge Müller-Ebhardt, Kentaro Somiya, Stefan L. Danilishin, Roman Schnabel, Karsten Danzmann, and Yanbei Chen, Double optical spring enhancement for gravitational-wave detectors, Phys. Rev. D 78, 062003 (2008).
    • Nicolai B. Grosse, Syed Assad, Moritz Mehmet, Roman Schnabel, Thomas Symul, and Ping Koy Lam, Observation of Entanglement between Two Light Beams Spanning an Octave in Optical Frequency, Phys. Rev. Lett. 100, 243601 (2008).
    • Boris Hage, Aiko Samblowski, James DiGuglielmo, Alexander Franzen, Jaromir Fiurasek, Roman Schnabel, Preparation of distilled and purified continuous variable entangled states, Nature Physics 4, 915 (2008).
    • F. Brückner, T. Clausnitzer, O. Burmeister, D. Friedrich, E.-B. Kley, K. Danzmann, A. Tünnermann, and R. Schnabel: Monolithic dielectric surfaces as new low-loss light-matter interfaces, Optics Letters 33, 264 (2008).
    • H. Vahlbruch, M. Mehmet, N. Lastzka, B. Hage, S. Chelkowski, A. Franzen, S. Gossler, K. Danzmann, and R. Schnabel: Observation of squeezed light with 10dB quantum noise reduction, Phys. Rev. Lett. 100 (2008).
    • H. Müller-Ebhardt, H. Rehbein, R. Schnabel, K. Danzmann, Y. Chen: Entanglement of macroscopic test masses and the standard quantum limit in laser interferometry, Phys. Rev. Lett. 100, 013601 (2008).
    • D. Friedrich, O. Burmeister, A. Bunkowski, T. Clausnitzer, S. Fahr, E.-B. Kley, A. Tünnermann, K. Danzmann, and R. Schnabel: Diffractive beam splitter characterization via a power-recycled interferometer, Optics Letters 33, 101 (2008).
    2007
    • Petr Marek, Jaromir Fiurasek, Boris Hage, Alexander Franzen, James DiGugliemo, and Roman Schnabel: Multiple-copy distillation and purification of phase-diffused squeezed states, Phys. Rev. A 76, 053820 (2007).
    • A Freise, A Bunkowski, and R Schnabel: Phase and alignment noise in grating interferometers, New J. Phys. 9, 433 (2007).
    • H. Vahlbruch, S. Chelkowski, K. Danzmann, and R. Schnabel: Quantum engineering of squeezed states for quantum communication and metrology, New J. Phys. 9, 371 (2007).
    • H. Rehbein, H. Müller-Ebhardt, K. Somiya, C. Li, R. Schnabel, K. Danzmann, Y. Chen: Local readout enhancement for detuned signal-recycling interferometers, Phys. Rev. D 76, 062002 (2007).
    • R. Nawrodt, A. Zimmer, T. Koettig, T. Clausnitzer, A. Bunkowski, E.-B. Kley, R. Schnabel, K. Danzmann, W. Vodel, A. Tünnermann, and P. Seidel: Mechanical Q-factor measurements on a test mass with a structured surface, New J. Phys. 9, 225 (2007).
    • B. Hage, A. Franzen, J. DiGuglielmo, P. Marek, J. Fiurášek, and R. Schnabel: On the distillation and purification of phase-diffused squeezed states, New J. Phys. 9, 227 (2007).
    • J. DiGuglielmo, B. Hage, A. Franzen, J. Fiurášek, and R. Schnabel: Experimental characterization of Gaussian quantum communication channels, Phys. Rev. A 76, 012323 (2007).
    • N. Lastzka and R. Schnabel: The Gouy phase shift in nonlinear interactions of waves, Optics Express 15, 7211 (2007).
    • Jaromír Fiurášek, Petr Marek, Radim Filip, and Roman Schnabel: Experimentally feasible purification of continuous-variable entanglement, Phys. Rev. A 75, 050302(R) (2007).
    • S. Chelkowski, H. Vahlbruch, K. Danzmann, and R. Schnabel: Coherent control of broadband vacuum squeezing, Phys. Rev. A 75, 043814 (2007).
    • A. Thüring, R. Schnabel, H. Lück, and K. Danzmann: Detuned Twin-Signal-Recycling for ultra-high precision interferometers, Optics Letters 32, 985 (2007).
    2006
    • A. Bunkowski, O. Burmeister, D. Friedrich, K. Danzmann, and R. Schnabel: High reflectivity grating waveguide coatings for 1064 nm, Class. Quantum Grav. 23, 7297 (2006).
    • A. Franzen, B. Hage, J. DiGuglielmo, Jaromír Fiurášek, and R. Schnabel: Experimental demonstration of continuous variable purification of squeezed states, Phys. Rev. Lett. 97, 150505 (2006).
    • H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel: Coherent control of vacuum squeezing in the gravitational-wave detection band, Phys. Rev. Lett. 97, 011101 (2006).
    • A. Bunkowski, O. Burmeister, K. Danzmann, R. Schnabel, T. Clausnitzer, E.-B. Kley, and Tünnermann: Demonstration of 3-port grating phase relations, Optics Letters 31, 2384 (2006).
    • S Nietzsche, R Nawrodt, A Zimmer, R Schnabel, W Vodel and P Seidel: Cryogenic Q-factor measurement of optical substrates for optimization of gravitational wave detectors, Supercond. Sci. Technol. 19, S293 (2006).
    • A. Bunkowski, O. Burmeister, T. Clausnitzer, E.-B. Kley, A. Tünnermann, K. Danzmann, and R. Schnabel: Optical Characterization of ultra-high efficiency gratings, Applied Optics 45, 5795 (2006).
    • R. Schnabel, A. Bunkowski, O. Burmeister, and K. Danzmann: Three-port beam splitters/combiners for interferometer applications, Optics Letters, 31, 658 (2006).
    2005
    • H. Vahlbruch, S. Chelkowski, B. Hage, A. Franzen, K. Danzmann, and R. Schnabel: Demonstration of a squeezed light enhanced power- and signal-recycled Michelson interferometer, Phys. Rev. Lett. 95, 211102 (2005).
    • H. Rehbein, J. Harms, R. Schnabel, and K. Danzmann: Optical transfer functions of Kerr nonlinear cavities and interferometers, Phys. Rev. Lett. 95, 193001 (2005).
    • T. Clausnitzer, E.-B. Kley, A. Tünnermann, A. Bunkowski, O. Burmeister, K. Danzmann, R. Schnabel, A. Duparré, and S. Gliech: Ultra low-loss low-efficiency diffraction gratings, Opt. Exp. 13, 4370 (2005).
    • A. Bunkowski, O. Burmeister, K. Danzmann, and R. Schnabel: Input-output relations for a three-port grating coupled Fabry-Perot cavity, Optics Letters 30, 1183 (2005).
    • S. Chelkowski, H. Vahlbruch, B. Hage, A. Franzen, N. Lastzka, K. Danzmann, and R. Schnabel: Experimental characterization of frequency-dependent squeezed light, Phys. Rev. A 71, 013806 (2005).
    2004
    • A. Bunkowski, O. Burmeister, P. Beyersdorf, K. Danzmann, R. Schnabel, T. Clausnitzer, E.-B. Kley, and Tünnermann: Low-loss grating for coupling to a high-finesse cavity, Optics Letters 29, 2342 (2004).
    • Jan Harms, Roman Schnabel, and Karsten Danzmann: Finite mass beam splitter in high power interferometers, Phys. Rev. D 70, 102001 (2004).
    • R. Schnabel, H. Vahlbruch, A. Franzen, S. Chelkowski, N. Grosse, H.-A. Bachor, W. P. Bowen, P. K. Lam, and K. Danzmann: Squeezed light at sideband frequencies below 100 kHz from a single OPA, Optics Communications 240, 185 (2004).
    • R. Schnabel, J. Harms, K.A. Strain, and K. Danzmann: Squeezed light for the interferometric detection of high frequency gravitational waves, Class. Quantum Grav. 21, S1045 (2004).
    2003
    • Jan Harms, Yanbei Chen, Simon Chelkowski, Alexander Franzen, Henning Vahlbruch, Karsten Danzmann, and Roman Schnabel: Squeezed-input, optical-spring, signal-recycled gravitational-wave detectors, Phys. Rev. D 68, 042001 (2003).

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