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  <doc>
    <id>3232</id>
    <completedYear/>
    <publishedYear>2016</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>131</pageFirst>
    <pageLast>136</pageLast>
    <pageNumber/>
    <edition/>
    <issue>1</issue>
    <volume>10</volume>
    <type>article</type>
    <publisherName>WILEY-VCH</publisherName>
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    <title language="eng">Tunable generation of entangled photons in a nonlinear directional coupler</title>
    <abstract language="eng">The on-chip integration of quantum light sources has enabled the realization of complex quantum photonic circuits. However, for the practical implementation of such circuits in quantum information applications, it is crucial to develop sources delivering entangled quantum photon states with on-demand tunability. Here we propose and experimentally demonstrate the concept of a widely tunable quantum light source based on spontaneous parametric down-conversion in a simple nonlinear directional coupler. We show that spatial photon-pair correlations and entanglement can be reconfigured on-demand by tuning the phase difference between the pump beams and the phase mismatch inside the structure. We experimentally demonstrate the generation of split states, robust N00N states, various intermediate regimes and biphoton steering on a single chip. Furthermore we theoretically investigate other regimes allowing all-optically tunable generation of all Bell states and flexible control of path-energy entanglement. Such wide-range capabilities of a structure comprised of just two coupled nonlinear waveguides are attributed to the intricate interplay between linear coupling and nonlinear phase matching. This scheme provides an important advance towards the realization of reconfigurable quantum circuitry.</abstract>
    <parentTitle language="eng">Laser &amp; Photonics Reviews</parentTitle>
    <identifier type="doi">10.1002/lpor.201500216</identifier>
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    <licence>Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG</licence>
    <author>Frank Setzpfandt</author>
    <author>Alexander S. Solntsev</author>
    <author>James Titchener</author>
    <author>Che Wen Wu</author>
    <author>Chunle Xiong</author>
    <author>Roland Schiek</author>
    <author>Thomas Pertsch</author>
    <author>Dragomir N. Neshev</author>
    <author>Andrey A. Sukhorukov</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>ARRAYS</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>directional coupler</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>entanglement</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>GATES</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>nonlinearity</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>PAIR GENERATION</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>photon pairs</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>WAVE</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>waveguides</value>
    </subject>
    <collection role="institutes" number="FakEI">Fakultät Elektro- und Informationstechnik</collection>
    <collection role="othforschungsschwerpunkt" number="16315">Information und Kommunikation</collection>
  </doc>
  <doc>
    <id>3727</id>
    <completedYear/>
    <publishedYear>2015</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue>paper NW2A.4</issue>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>OSA</publisherName>
    <publisherPlace>Washington, D.C.</publisherPlace>
    <creatingCorporation/>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
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    <title language="eng">Optically Tunable Entangled Photon State Generation in a Nonlinear Directional Coupler</title>
    <abstract language="deu">We propose and experimentally demonstrate an all-optically tunable biphoton quantum light source using a nonlinear directional coupler. The source can generate high-fidelity N00N states, completely split states, and states with variable degrees of entanglement.</abstract>
    <parentTitle language="eng">Nonlinear Optics [Kauai, Hawaii 26-31 July 2015]</parentTitle>
    <identifier type="isbn">978-1-55752-001-2</identifier>
    <identifier type="doi">10.1364/nlo.2015.nw2a.4</identifier>
    <enrichment key="opus.import.date">2022-04-28T18:57:25+00:00</enrichment>
    <enrichment key="opus.source">sword</enrichment>
    <enrichment key="opus.import.user">importuser</enrichment>
    <enrichment key="BegutachtungStatus">peer-reviewed</enrichment>
    <licence>Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG</licence>
    <author>Frank Setzpfandt</author>
    <author>Alexander S. Solntsev</author>
    <author>James Titchener</author>
    <author>Che Wen Wu</author>
    <author>Chunle Xiong</author>
    <author>Thomas Pertsch</author>
    <author>Roland Schiek</author>
    <author>Dragomir N. Neshev</author>
    <author>Andrey A. Sukhorukov</author>
    <collection role="institutes" number="FakEI">Fakultät Elektro- und Informationstechnik</collection>
    <collection role="othforschungsschwerpunkt" number="16315">Information und Kommunikation</collection>
  </doc>
  <doc>
    <id>3702</id>
    <completedYear/>
    <publishedYear>2015</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>OSA</publisherName>
    <publisherPlace>Washington, D.C.</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Optically tunable entangled photon state generation in a nonlinear directional coupler</title>
    <abstract language="eng">We propose and experimentally demonstrate an all-optically tunable biphoton quantum light source using a nonlinear directional coupler. The source can generate high-fidelity N00N states, completely split states, and states with variable degrees of entanglement.</abstract>
    <parentTitle language="eng">CLEO: QELS_Fundamental Science 2015, San Jose, California, United States, 10-15 May 2015</parentTitle>
    <identifier type="isbn">978-1-55752-968-8</identifier>
    <identifier type="doi">10.1364/cleo_qels.2015.fth4d.3</identifier>
    <enrichment key="opus.import.date">2022-04-28T18:45:44+00:00</enrichment>
    <enrichment key="opus.source">sword</enrichment>
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    <enrichment key="BegutachtungStatus">peer-reviewed</enrichment>
    <licence>Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG</licence>
    <author>Frank Setzpfandt</author>
    <author>Alexander S. Solntsev</author>
    <author>James Titchener</author>
    <author>Che Wen Wu</author>
    <author>Chunle Xiong</author>
    <author>Thomas Pertsch</author>
    <author>Roland Schiek</author>
    <author>Dragomir N. Neshev</author>
    <author>Andrey A. Sukhorukov</author>
    <collection role="institutes" number="FakEI">Fakultät Elektro- und Informationstechnik</collection>
    <collection role="othforschungsschwerpunkt" number="16315">Information und Kommunikation</collection>
  </doc>
  <doc>
    <id>8874</id>
    <completedYear>2025</completedYear>
    <publishedYear>2025</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1100</pageFirst>
    <pageLast>1117</pageLast>
    <pageNumber/>
    <edition/>
    <issue>5</issue>
    <volume>15</volume>
    <type>article</type>
    <publisherName>Optica Publishing Group</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Measurement of the cubic nonlinear susceptibility in lithium niobate</title>
    <abstract language="eng">We measured the cubic nonlinear susceptibility tensor elements ( χ(3)) for polarization along the primary crystallographic axis in titanium-indiffused lithium niobate waveguides, assessed through self-phase modulation using picosecond-duration pulses at telecommunication wavelengths. A dominant, highly temperature- and wavelength-dependent contribution from a cascaded second-order nonlinearity is observed. Through careful extraction of the cascaded effect, we quantify the intrinsic third-order susceptibility tensor elements as χ(3) zzzz(ω; ω, ω, −ω) = (5.2 ± 1.3) × 10−21 m2 V2 and χ(3) xxxx(ω; ω, ω, −ω) = χ(3) yyyy(ω; ω, ω, −ω) = (3.6 ± 0.8) × 10−21 m2 V2 .&#13;
These measurements underscore the substantial impact of the cascaded nonlinearity in enhancing the effective cubic nonlinearity in lithium niobate and offer precise values essential for the design of nonlinear photonic devices.</abstract>
    <parentTitle language="eng">Optical Materials Express</parentTitle>
    <identifier type="issn">2159-3930</identifier>
    <identifier type="doi">10.1364/OME.557516</identifier>
    <note>Corresponding author der OTH Regensburg: Schiek, Roland</note>
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    <enrichment key="CorrespondingAuthor">Roland Schiek</enrichment>
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    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>Roland Schiek</author>
    <author>Alexander S. Solntsev</author>
    <author>Dragomir N. Neshev</author>
    <collection role="institutes" number="FakEI">Fakultät Elektro- und Informationstechnik</collection>
    <collection role="oaweg" number="">Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium</collection>
    <collection role="oaweg" number="">Corresponding author der OTH Regensburg</collection>
    <collection role="funding" number="">Publikationsfonds der OTH Regensburg</collection>
    <collection role="DFGFachsystematik" number="1">Ingenieurwissenschaften</collection>
    <collection role="othforschungsschwerpunkt" number="">Materialien und Produktion</collection>
  </doc>
</export-example>
