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J.-Prof. Dr. Tim Bartley

Kontakt
Publikationen
J.-Prof. Dr. Tim Bartley

Mesoskopische Quantenoptik

Leiter - Juniorprofessor

Integrierte Quantenoptik

Mitglied - Alumnus

Telefon:
+49 5251 60-5881
Büro:
P8.3.13
Besucher:
Pohlweg 47-49
33098 Paderborn

Liste im Research Information System öffnen

2021

Generating two-mode squeezing with multimode measurement-induced nonlinearity

M. Riabinin, P. Sharapova, T. Bartley, T. Meier, Journal of Physics Communications (2021)

DOI


Quantum detector tomography of a high dynamic-range superconducting nanowire single-photon detector

T. Schapeler, J.P. Höpker, T. Bartley, Superconductor Science and Technology (2021), 064002

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Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides

J.P. Höpker, V.B. Verma, M. Protte, R. Ricken, V. Quiring, C. Eigner, L. Ebers, M. Hammer, J. Förstner, C. Silberhorn, R.P. Mirin, S. Woo Nam, T. Bartley, Journal of Physics: Photonics (2021), 3, pp. 034022

We demonstrate the integration of amorphous tungsten silicide superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides. We show proof-of-principle detection of evanescently coupled photons of 1550 nm wavelength using bidirectional waveguide coupling for two orthogonal polarization directions. We investigate the internal detection efficiency as well as detector absorption using coupling-independent characterization measurements. Furthermore, we describe strategies to improve the yield and efficiency of these devices.


A Versatile Metasurface Enabling Superwettability for Self‐Cleaning and Dynamic Color Response

J. Lu, B. Sain, P. Georgi, M. Protte, T. Bartley, T. Zentgraf, Advanced Optical Materials (2021), 2101781

Metasurfaces provide applications for a variety of flat elements and devices due to the ability to modulate light with subwavelength structures. The working principle meanwhile gives rise to the crucial problem and challenge to protect the metasurface from dust or clean the unavoidable contaminants during daily usage. Here, taking advantage of the intelligent bioinspired surfaces which exhibit self-cleaning properties, a versatile dielectric metasurface benefiting from the obtained superhydrophilic or quasi-superhydrophobic states is shown. The design is realized by embedding the metasurface inside a large area of wettability supporting structures, which is highly efficient in fabrication, and achieves both optical and wettability functionality at the same time. The superhydrophilic state enables an enhanced optical response with water, while the quasi-superhydrophobic state imparts the fragile antennas an ability to self-clean dust contamination. Furthermore, the metasurface can be easily switched and repeated between these two wettability or functional states by appropriate treatments in a repeatable way, without degrading the optical performance. The proposed design strategy will bring new opportunities to smart metasurfaces with improved optical performance, versatility, and physical stability.


2020

Cryogenic electro-optic polarisation conversion in titanium in-diffused lithium niobate waveguides

F. Thiele, F. vom Bruch, V. Quiring, R. Ricken, H. Herrmann, C. Eigner, C. Silberhorn, T. Bartley, Optics Express (2020), 28961

DOI


Single-channel electronic readout of a multipixel superconducting nanowire single photon detector

J. Tiedau, T. Schapeler, V. Anant, H. Fedder, C. Silberhorn, T. Bartley, Optics Express (2020), 5528

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Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics

M. Protte, L. Ebers, M. Hammer, J.P. Höpker, M. Albert, V. Quiring, C. Meier, J. Förstner, C. Silberhorn, T. Bartley, in: OSA Quantum 2.0 Conference, 2020

We fabricate silicon tapers to increase the mode overlap of superconducting detectors on Ti:LiNbO3 waveguides. Mode images show a reduction in mode size from 6 µm to 2 µm FWHM, agreeing with beam propagation simulations.


Quantum detector tomography of a 2×2 multi-pixel array of superconducting nanowire single photon detectors

T. Schapeler, J. Philipp Höpker, T. Bartley, Optics Express (2020), 33035

DOI


2019

Scalability of parametric down-conversion for generating higher-order Fock states

J. Tiedau, T. Bartley, G. Harder, A.E. Lita, S.W. Nam, T. Gerrits, C. Silberhorn, Physical Review A (2019)

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Engineering integrated photon pair sources and multiplexed detectors (Conference Presentation)

E. Meyer-Scott, N. Prasannan, N. Montaut, J. Tiedau, C. Eigner, G. Harder, L. Sansoni, T. Nitsche, H. Herrmann, R. Ricken, V. Quiring, T. Bartley, S. Barkhofen, C. Silberhorn, in: Advances in Photonics of Quantum Computing, Memory, and Communication XII, 2019

DOI


A high dynamic range optical detector for measuring single photons and bright light

J. Tiedau, E. Meyer-Scott, T. Nitsche, S. Barkhofen, T. Bartley, C. Silberhorn, Optics Express (2019), 1

DOI


Generating two-mode squeezing with multimode measurement-induced nonlinearity

M. Riabinin, P. Sharapova, T. Bartley, T. Meier, in: arXiv:1912.09097, 2019

Measurement-induced nonclassical effects in a two-mode interferometer are investigated theoretically using numerical simulations and analytical results. We demonstrate that for certain parameters measurements within the interferometer lead to the occurrence of two-mode squeezing. The results strongly depend on the detection probability, the phase inside the interferometer, and the choice of the input states. The appropriate parameters for maximized squeezing are obtained. We analyze the influence of losses and confirm that the predicted effects are within reach of current experimental techniques.


Integrated transition edge sensors on titanium in-diffused lithium niobate waveguides

J.P. Höpker, T. Gerrits, A. Lita, S. Krapick, H. Herrmann, R. Ricken, V. Quiring, R. Mirin, S.W. Nam, C. Silberhorn, T. Bartley, APL Photonics (2019), 056103

DOI


2018

Heralded orthogonalisation of coherent states and their conversion to discrete-variable superpositions

R. Kruse, C. Silberhorn, T. Bartley, Quantum Measurements and Quantum Metrology (2018), 4(1)

<jats:title>Abstract</jats:title><jats:p>The nonorthogonality of coherent states is a fundamental property which prevents them from being perfectly and deterministically discriminated. Here, we present an experimentally feasible protocol for the probabilistic orthogonalisation of a pair of coherent states, independent of their amplitude and phase. In contrast to unambiguous state discrimination, a successful operation of our protocol is heralded without measuring the states. As such, they remain suitable for further manipulation and the obtained orthogonal states serve as a discretevariable basis. Therefore, our protocol doubles as a simple continuous-to-discrete variable converter, which may find application in hybrid continuous-discrete quantum information processing protocols.</jats:p>


Incomplete Detection of Nonclassical Phase-Space Distributions

M. Bohmann, J. Tiedau, T. Bartley, J. Sperling, C. Silberhorn, W. Vogel, Physical Review Letters (2018)

DOI


Engineering integrated sources of entangled photon pairs

E. Meyer-Scott, N. Prasannan, N. Montaut, J. Tiedau, G. Harder, L. Sansoni, H. Herrmann, C. Eigner, R. Ricken, V. Quiring, T. Bartley, S. Barkhofen, C. Silberhorn, in: Frontiers in Optics / Laser Science, 2018

DOI


Compressive characterization of telecom photon pairs in the spatial and spectral degrees of freedom

N. Montaut, O.S. Magaña-Loaiza, T. Bartley, V.B. Verma, S.W. Nam, R.P. Mirin, C. Silberhorn, T. Gerrits, Optica (2018), 1418

DOI


Incomplete Detection of Nonclassical Phase-Space Distributions

M. Bohmann, J. Tiedau, T. Bartley, J. Sperling, C. Silberhorn, W. Vogel, Physical Review Letters (2018)

DOI


Quantum state and mode profile tomography by the overlap

J. Tiedau, V.S. Shchesnovich, D. Mogilevtsev, V. Ansari, G. Harder, T. Bartley, N. Korolkova, C. Silberhorn, New Journal of Physics (2018), 033003

DOI


2017

Full statistical mode reconstruction of a light field via a photon-number-resolved measurement

I.A. Burenkov, A.K. Sharma, T. Gerrits, G. Harder, T. Bartley, C. Silberhorn, E.A. Goldschmidt, S.V. Polyakov, Physical Review A (2017)

DOI


Discorrelated quantum states

E. Meyer-Scott, J. Tiedau, G. Harder, L.K. Shalm, T. Bartley, Scientific Reports (2017), 7

DOI


Limits of the time-multiplexed photon-counting method

R. Kruse, J. Tiedau, T. Bartley, S. Barkhofen, C. Silberhorn, Physical Review A (2017)

DOI


Driven Boson Sampling

S. Barkhofen, T. Bartley, L. Sansoni, R. Kruse, C.S. Hamilton, I. Jex, C. Silberhorn, Physical Review Letters (2017)

DOI


Harnessing temporal modes for multi-photon quantum information processing based on integrated optics

G. Harder, V. Ansari, T. Bartley, B. Brecht, C. Silberhorn, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences (2017), 375(2099), 20160244

<jats:p>In the last few decades, there has been much progress on low loss waveguides, very efficient photon-number detectors and nonlinear processes. Engineered sum-frequency conversion is now at a stage where it allows operation on arbitrary temporal broadband modes, thus making the spectral degree of freedom accessible for information coding. Hereby the information is often encoded into the temporal modes of a single photon. Here, we analyse the prospect of using multi-photon states or squeezed states in different temporal modes based on integrated optics devices. We describe an analogy between mode-selective sum-frequency conversion and a network of spatial beam splitters. Furthermore, we analyse the limits on the achievable squeezing in waveguides with current technology and the loss limits in the conversion process.</jats:p> <jats:p>This article is part of the themed issue ‘Quantum technology for the 21st century’.</jats:p>


Towards integrated superconducting detectors on lithium niobate waveguides

J.P. Höpker, M. Bartnick, E. Meyer-Scott, F. Thiele, T. Meier, T. Bartley, S. Krapick, N.M. Montaut, M. Santandrea, H. Herrmann, S. Lengeling, R. Ricken, V. Quiring, A.E. Lita, V.B. Verma, T. Gerrits, S.W. Nam, C. Silberhorn, in: Quantum Photonic Devices, 2017, pp. 1035809

DOI


Limits on the heralding efficiencies and spectral purities of spectrally filtered single photons from photon-pair sources

E. Meyer-Scott, N. Montaut, J. Tiedau, L. Sansoni, H. Herrmann, T. Bartley, C. Silberhorn, Physical Review A (2017)

DOI


Harnessing temporal modes for multi-photon quantum information processing based on integrated optics

G. Harder, V. Ansari, T. Bartley, B. Brecht, C. Silberhorn, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences (2017), 20160244

DOI


2016

Quantum enhanced estimation of optical detector efficiencies

M. Barbieri, A. Datta, T. Bartley, X. Jin, W.S. Kolthammer, I.A. Walmsley, Quantum Measurements and Quantum Metrology (2016)

<jats:title>Abstract</jats:title><jats:p>Quantum mechanics establishes the ultimate limit to the scaling of the precision on any parameter, by identifying optimal probe states and measurements. While this paradigm is, at least in principle, adequate for the metrology of quantum channels involving the estimation of phase and loss parameters, we show that estimating the loss parameters associated with a quantum channel and a realistic quantum detector are fundamentally different. While Fock states are provably optimal for the former, we identify a crossover in the nature of the optimal probe state for estimating detector imperfections as a function of the loss parameter using Fisher information as a benchmark. We provide theoretical results for on-off and homodyne detectors, the most widely used detectors in quantum photonics technologies, when using Fock states and coherent states as probes.</jats:p>


Quantum enhanced estimation of optical detector efficiencies

M. Barbieri, A. Datta, T. Bartley, X. Jin, W.S. Kolthammer, I.A. Walmsley, Quantum Measurements and Quantum Metrology (2016)

<jats:title>Abstract</jats:title><jats:p>Quantum mechanics establishes the ultimate limit to the scaling of the precision on any parameter, by identifying optimal probe states and measurements. While this paradigm is, at least in principle, adequate for the metrology of quantum channels involving the estimation of phase and loss parameters, we show that estimating the loss parameters associated with a quantum channel and a realistic quantum detector are fundamentally different. While Fock states are provably optimal for the former, we identify a crossover in the nature of the optimal probe state for estimating detector imperfections as a function of the loss parameter using Fisher information as a benchmark. We provide theoretical results for on-off and homodyne detectors, the most widely used detectors in quantum photonics technologies, when using Fock states and coherent states as probes.</jats:p>


Single-Mode Parametric-Down-Conversion States with 50 Photons as a Source for Mesoscopic Quantum Optics

G. Harder, T. Bartley, A.E. Lita, S.W. Nam, T. Gerrits, C. Silberhorn, Physical Review Letters (2016)

DOI


Quantum Correlations from the Conditional Statistics of Incomplete Data

J. Sperling, T. Bartley, G. Donati, M. Barbieri, X. Jin, A. Datta, W. Vogel, I. Walmsley, Physical Review Letters (2016)

DOI


Quantum Correlations from the Conditional Statistics of Incomplete Data

J. Sperling, T. Bartley, G. Donati, M. Barbieri, X. Jin, A. Datta, W. Vogel, I. Walmsley, Physical Review Letters (2016)

DOI


2015

Directly comparing entanglement-enhancing non-Gaussian operations

T. Bartley, I.A. Walmsley, New Journal of Physics (2015), 023038

DOI


2014

Observing optical coherence across Fock layers with weak-field homodyne detectors

G. Donati, T. Bartley, X. Jin, M. Vidrighin, A. Datta, M. Barbieri, I.A. Walmsley, Nature Communications (2014)

DOI


2013

Direct Observation of Sub-Binomial Light

T. Bartley, G. Donati, X. Jin, A. Datta, M. Barbieri, I.A. Walmsley, Physical Review Letters (2013)

DOI


Strategies for enhancing quantum entanglement by local photon subtraction

T. Bartley, P.J.D. Crowley, A. Datta, J. Nunn, L. Zhang, I. Walmsley, Physical Review A (2013)

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Requirements for two-source entanglement concentration

M. Vidrighin, T. Bartley, G. Donati, X. Jin, M. Barbieri, W.S. Kolthammer, A. Datta, I.A. Walmsley, Quantum Measurements and Quantum Metrology (2013)

DOI


2012

Multiphoton state engineering by heralded interference between single photons and coherent states

T. Bartley, G. Donati, J.B. Spring, X. Jin, M. Barbieri, A. Datta, B.J. Smith, I.A. Walmsley, Physical Review A (2012)

DOI


2011

Continuous phase stabilization and active interferometer control using two modes

G. Jotzu, T. Bartley, H.B. Coldenstrodt-Ronge, B.J. Smith, I.A. Walmsley, Journal of Modern Optics (2011), pp. 42-45

DOI


2009

Feasibility of free space quantum key distribution with coherent polarization states

D. Elser, T. Bartley, B. Heim, C. Wittmann, D. Sych, G. Leuchs, New Journal of Physics (2009)(4), pp. 045014

We demonstrate for the first time the feasibility of free space quantum key distribution with continuous variables under real atmospheric conditions. More specifically, we transmit coherent polarization states over a 100 m free space channel on the roof of our institute's building. In our scheme, signal and local oscillator (LO) are combined in a single spatial mode, which auto-compensates atmospheric fluctuations and results in an excellent interference. Furthermore, the LO acts as a spatial and spectral filter, thus allowing unrestrained daylight operation.


Atmospheric channel characteristics for quantum communication with continuous polarization variables

B. Heim, D. Elser, T. Bartley, M. Sabuncu, C. Wittmann, D. Sych, C. Marquardt, G. Leuchs, Applied Physics B (2009), pp. 635-640

DOI


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