Dr. Benjamin Brecht

Contact

Biography

Publications

Integrated Quantum Optics

Academic Senior Councillor - Group leader "Quantum Networks"

VCard

Institute for photonic quantum systems (PhoQS)

Manager - Academic Senior Councillor - Management

VCard

Phone:

+49 5251 60-5899

Fax:

+49 5251 60-5886

E-mail:

benjamin.brecht(at)upb(dot)de

Office:

ST0.335

Visitor:

Warburger Str. 100
33098 Paderborn

07/2022 - today	Co-Investigator of the QuantERA Project E2TPA The E2TPA (Exploiting Entangled Two-Photon Absorption) project aims to understand and harness the physics behind the interaction of entangled quantum light and molecules. Within the project, we are developing customised quantum light sources for entangled two-photon absorption together with our national and international partners. I am leading and coordinating the research at the Paderborn site.
03/2021 - today	Manager of the Institute for Photonic Quantum Systems (PhoQS) The interdisciplinary Institute for Photonic Quantum Systems (PhoQS) aims to combine expertise from the areas of experimental and theoretical physics, computer science, electrical engineering, and mathematics to realise photonic quantum technologies for applications in the emerging fields of quantum communications, quantum metrology and sensing, quantum simulations, and quantum computing.
10/2020 - today	Co-Investigator of the EU HORIZON2020 FET-OPEN Project STORMYTUNE STORMYTUNE (Spectral-temporal metrology with tailored quantum measurements) explores novel ways to improve the performance of spectroscopy techniques by using quantum measurements. As co-coordinator of the project, I am the scientific contact point for the EU. Further, I am responsible for the day to day coordination of the consortium and am leading the research efforts in Paderborn.
10/2020 - today	Co-Investigator of the QuantERA Project ApresSF In ApresSF (Application-ready superresolution in space and frequency), we aim to improve superresolving measurements and to bring them closer to industrial application. I am leading the research efforts in Paderborn, which focus on the continuous improvement of time-frequency measurements.
10/2018 - today	Deputy Senate Speaker of Paderborn University
06/2018 - today	Group leader "Quantum Networks" at Paderborn University The "Quantum Networks" group is part of the Silberhorn group. We are interested in the generation, manipulation, and utilization of quantum light in different areas of application. Examples include quantum simulations based on time-multiplexed quantum walks, ultra-precise time-frequency metrology, and high-dimensional time-frequency quantum communications.
10/2015 - 09/2018	Co-Investigator of the EU FP7 FET-OPEN Project QCUMbER In QCUMbER (Quantum-controlled ultrafast multimode entanglement and measurement), we investigated the utilisation of the spectral-temporal structure of quantum light. Part of my contribution to the project was the day to day coordination during my time in Oxford.
05/2015 - 05/2018	Postdoc at the University of Oxford, UK Work on quantum memories in warm caesium vapour in the group of Prof Ian A. Walmsley. During my time we invented, patented and deployed a novel memory protocol - ORCA - for the storage and retrieval of heralded single photons.
04/2014 - 04/2015	Postdoc at Paderborn University Work on the time-frequency manipulation of quantum light
08/2009 - 03/2014	Doctoral thesis at the Max Planck Institute for the Science of Light and the Paderborn University Thesis title: Engineering ultrafast quantum frequency conversion
07/2008 - 07/2009	Physics diploma at the FAU Erlangen-Nuremberg Title of the diploma thesis: Generation of decorrelated photon pairs in photonic crystal fibres

Open list in Research Information System

2023

Verschränkung wie am Fließband

S. Barkhofen, B. Brecht, C. Silberhorn, Physik in unserer Zeit (2023), 54(1), pp. 10-11

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2022

Direct Measurement of Higher-Order Nonlinear Polarization Squeezing

N. Prasannan, J. Sperling, B. Brecht, C. Silberhorn, Physical Review Letters (2022), 129(26), 263601

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Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing

E. Meyer-Scott, N. Prasannan, I. Dhand, C. Eigner, V. Quiring, S. Barkhofen, B. Brecht, M.B. Plenio, C. Silberhorn, Physical Review Letters (2022), 129(15), 150501

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Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing

E. Meyer-Scott, N. Prasannan, I. Dhand, C. Eigner, V. Quiring, S. Barkhofen, B. Brecht, M.B. Plenio, C. Silberhorn, Physical Review Letters (2022), 129(15), 150501

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2021

Effects of coherence on temporal resolution

S. De, J. Gil López, B. Brecht, C. Silberhorn, L.L. Sánchez-Soto, Z. Hradil, J. Řeháček, Physical Review Research (2021), 3(3), 033082

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Achieving the Ultimate Quantum Timing Resolution

V. Ansari, B. Brecht, J. Gil-Lopez, J.M. Donohue, J. Řeháček, Z. Hradil, L.L. Sánchez-Soto, C. Silberhorn, PRX Quantum (2021), 2, 010301

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Continuous variable multimode quantum states via symmetric group velocity matching

V. Roman-Rodriguez, B. Brecht, K. Srinivasan, C. Silberhorn, N. Treps, E. Diamanti, V. Parigi, New Journal of Physics (2021), 23, 043012

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Statistical Benchmarking of Scalable Photonic Quantum Systems

J. Tiedau, M. Engelkemeier, B. Brecht, J. Sperling, C. Silberhorn, Physical Review Letters (2021), 126, 023601

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Experimental entanglement characterization of two-rebit states

N. Prasannan, S. De, S. Barkhofen, B. Brecht, C. Silberhorn, J. Sperling, Physical Review A (2021), 103

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Improved non-linear devices for quantum applications

J. Gil López, M. Santandrea, G. Roland, B. Brecht, C. Eigner, R. Ricken, V. Quiring, C. Silberhorn, New Journal of Physics (2021), 063082

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Universal compressive tomography in the time-frequency domain

J. Gil López, Y.S. Teo, S. De, B. Brecht, H. Jeong, C. Silberhorn, L.L. Sánchez-Soto, Optica (2021), 1296

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2020

Pulse shaping using dispersion-engineered difference frequency generation

M. Allgaier, V. Ansari, J.M. Donohue, C. Eigner, V. Quiring, R. Ricken, B. Brecht, C. Silberhorn, Physical Review A (2020), 101, 043819

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Remotely projecting states of photonic temporal modes

V. Ansari, J.M. Donohue, B. Brecht, C. Silberhorn, Optics Express (2020), 28(19), 28295-28305

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Spatial entanglement and state engineering via four-photon Hong–Ou–Mandel interference

A. Ferreri, V. Ansari, B. Brecht, C. Silberhorn, P.R. Sharapova, Quantum Science and Technology (2020), 5(4), 045020

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Optimizing spontaneous parametric down-conversion sources for boson sampling

R. van der Meer, J.J. Renema, B. Brecht, C. Silberhorn, P.W.H. Pinkse, Physical Review A (2020), 101(6), 063821

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Spatial entanglement and state engineering via four-photon Hong–Ou–Mandel interference

A. Ferreri, V. Ansari, B. Brecht, C. Silberhorn, P. Sharapova, Quantum Science and Technology (2020), 5(4), 045020

Abstract

DOI

<jats:title>Abstract</jats:title> <jats:p>The phenomenon of entanglement is the basis of quantum information and quantum communication processes. Entangled systems with a large number of photons are of great interest at present because they provide a platform for streaming technologies based on photonics. In this paper we present a device which operates with four-photons and based on the Hong–Ou–Mandel interference. The presented device allows to maximize the degree of spatial entanglement and generate the highly entangled four-dimensional Bell states. Furthermore, the use of the interferometer in different regimes leads to fast interference fringes in the coincidence probability with period of oscillations twice smaller than the pump wavelength. We have a good agreement between theoretical simulations and experimental results.</jats:p>

Quantum photonics with active feedback loops

M. Engelkemeier, L. Lorz, S. De, B. Brecht, I. Dhand, M.B. Plenio, C. Silberhorn, J. Sperling, Physical Review A (2020), 102, 023712

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Spatially single mode photon pair source at 800 nm in periodically poled Rubidium exchanged KTP waveguides

C. Eigner, L. Padberg, M. Santandrea, H. Herrmann, B. Brecht, C. Silberhorn, Optics Express (2020), 28(22), 32925-32935

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2019

Experimental Reconstruction of Entanglement Quasiprobabilities

J. Sperling, E. Meyer-Scott, S. Barkhofen, B. Brecht, C. Silberhorn, Physical Review Letters (2019)

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2018

Tomography and Purification of the Temporal-Mode Structure of Quantum Light

V. Ansari, J.M. Donohue, M. Allgaier, L. Sansoni, B. Brecht, J. Roslund, N. Treps, G. Harder, C. Silberhorn, Physical Review Letters (2018), 120, 213601

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Tailoring nonlinear processes for quantum optics with pulsed temporal-mode encodings

V. Ansari, J.M. Donohue, B. Brecht, C. Silberhorn, Optica (2018), 5(5), 534-550

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Streak camera imaging of single photons at telecom wavelength

M. Allgaier, V. Ansari, C. Eigner, V. Quiring, R. Ricken, J.M. Donohue, T. Czerniuk, M. Aßmann, M. Bayer, B. Brecht, C. Silberhorn, Applied Physics Letters (2018), 112, 031110

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2017

Temporal-mode measurement tomography of a quantum pulse gate

V. Ansari, G. Harder, M. Allgaier, B. Brecht, C. Silberhorn, Physical Review A (2017), 96, 063817

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Highly efficient frequency conversion with bandwidth compression of quantum light

M. Allgaier, V. Ansari, L. Sansoni, C. Eigner, V. Quiring, R. Ricken, G. Harder, B. Brecht, C. Silberhorn, Nature Communications (2017), 14288

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A monolithic, doubly-resonant parametric down-conversion source for Caesium Raman memories

B. Brecht, O. Lazo-Arjona, K.T. Kaczmarek, T. Parker, R. Ricken, V. Quiring, C. Eigner, K.H. Luo, H. Herrmann, C. Silberhorn, I.A. Walmsley, in: Frontiers in Optics 2017, 2017

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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

Abstract

DOI

<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>

Fast time-domain measurements on telecom single photons

M. Allgaier, G. Vigh, V. Ansari, C. Eigner, V. Quiring, R. Ricken, B. Brecht, C. Silberhorn, Quantum Science and Technology (2017), 2, 034012

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2016

A versatile design for resonant guided-wave parametric down-conversion sources for quantum repeaters

B. Brecht, K. Luo, H. Herrmann, C. Silberhorn, Applied Physics B (2016), 122, pp. 116

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On-chip generation of photon-triplet states

S. Krapick, B. Brecht, H. Herrmann, V. Quiring, C. Silberhorn, Optics Express (2016), 24(3), 2836-2849

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A versatile design for resonant guided-wave parametric down-conversion sources for quantum repeaters

B. Brecht, K.H. Luo, H. Herrmann, C. Silberhorn, Applied Physics B (2016)

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2015

Photon Temporal Modes: A Complete Framework for Quantum Information Science

B. Brecht, D.V. Reddy, C. Silberhorn, M. Raymer, Physical Review X (2015), 5, 041017

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Direct generation of genuine single-longitudinal-mode narrowband photon pairs

K. Luo, H. Herrmann, S. Krapick, B. Brecht, R. Ricken, V. Quiring, H. Suche, W. Sohler, C. Silberhorn, New Journal of Physics (2015), 17, 073039

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Uncovering Quantum Correlations with Time-Multiplexed Click Detection

J. Sperling, M. Bohmann, W. Vogel, G. Harder, B. Brecht, V. Ansari, C. Silberhorn, Physical Review Letters (2015)

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Direct generation of genuine single-longitudinal-mode narrowband photon pairs

K.H. Luo, H. Herrmann, S. Krapick, B. Brecht, R. Ricken, V. Quiring, H. Suche, W. Sohler, C. Silberhorn, New Journal of Physics (2015), 073039

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2014

Bright integrated photon-pair source for practical passive decoy-state quantum key distribution

S. Krapick, M. Stefszky, M. Jachura, B. Brecht, M. Avenhaus, C. Silberhorn, Physical Review A (2014)

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Demonstration of coherent time-frequency Schmidt mode selection using dispersion-engineered frequency conversion

B. Brecht, A. Eckstein, R. Ricken, V. Quiring, H. Suche, L. Sansoni, C. Silberhorn, Physical Review A (2014), 90, 030302(R)

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2013

An optimized photon pair source for quantum circuits

G. Harder, V. Ansari, B. Brecht, T. Dirmeier, C. Marquardt, C. Silberhorn, Optics Express (2013), 21(12), 13975-13985

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Theory of quantum frequency conversion and type-II parametric down-conversion in the high-gain regime

A. Christ, B. Brecht, W. Mauerer, C. Silberhorn, New Journal of Physics (2013), 15, 053038

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Characterizing entanglement in pulsed parametric down-conversion using chronocyclic Wigner functions

B. Brecht, C. Silberhorn, Physical Review A (2013), 87, 053810

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An efficient integrated two-color source for heralded single photons

S. Krapick, H. Herrmann, V. Quiring, B. Brecht, H. Suche, C. Silberhorn, New Journal of Physics (2013), 15, 033010

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2011

From quantum pulse gate to quantum pulse shaper—engineered frequency conversion in nonlinear optical waveguides

B. Brecht, A. Eckstein, A. Christ, H. Suche, C. Silberhorn, New Journal of Physics (2011), 13, 065029

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A quantum pulse gate based on spectrally engineered sum frequency generation

A. Eckstein, B. Brecht, C. Silberhorn, Optics Express (2011), 19(15), 13770-13778

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Controlling the correlations in frequency upconversion in PPLN and PPKTP waveguides

B. Brecht, A. Eckstein, C. Silberhorn, physica status solidi (c) (2011), 8(4), pp. 1235-1238

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2010

Bridging visible and telecom wavelengths with a single-mode broadband photon pair source

C. Söller, B. Brecht, P.J. Mosley, L.Y. Zang, A. Podlipensky, N.Y. Joly, P.S.J. Russell, C. Silberhorn, Physical Review A (2010), 81, 031801(R)

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