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Papers by Jonathan jurkat

Physical Review Materials

In this paper, we introduce a novel quantum photonic device, which we term photonic Bier-Glass ca... more In this paper, we introduce a novel quantum photonic device, which we term photonic Bier-Glass cavity. We discuss its fabrication and functionality, which is based on the coupling of integrated In(Ga)As quantum dots to a broadband photonic cavity resonance. By design, the device architecture uniquely combines the Purcell enhancement of a photonic micropillar structure with broadband photonic mode shaping of a vertical, tapered waveguide, making it an interesting candidate to enable the efficient extraction of entangled photon pairs. We detail the epitaxial growth of the heterostructure and the necessary lithography steps to approach a GaAs-based photonic device with a height exceeding 15 µm, supported on a pedestal that can be as thin as 20 nm. We present an optical characterization, which confirms the presence of broadband optical resonances, in conjunction with amplified spontaneous emission of single photons.

Cornell University - arXiv, Sep 28, 2018

The key challenge to scalable optical quantum computing 1 , boson sampling 2 , and quantum metrol... more The key challenge to scalable optical quantum computing 1 , boson sampling 2 , and quantum metrology 3 is sources of single photons with near-unity system efficiency and simultaneously near-perfect indistinguishability in all degrees of freedom 4 (including spectral, temporal, spatial, and polarization). However, previous highindistinguishability solid-state single-photon sources 4-6 had to rely on polarization filtering that reduced the system efficiency by at least 50%. Here, we overcome this challenge by developing a new single-photon source based on a coherently driven quantum dot embedded in an elliptical micropillar. The asymmetric cavity lifts the polarization degeneracy into two orthogonal linearly polarized modes with a suitable energy separation 7. We design an excitation-collection scheme that allows the creation and collection of single photons with an indistinguishability of 0.976(1) and a degree of polarization of 91%. Our method provides a solution of combining near-unity system efficiency and indistinguishability compatible with background

Frontiers in Optics + Laser Science APS/DLS, 2019

 Users may download and print one copy of any publication from the public portal for the purpose... more  Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

We report on our advances to use quantum dots in micropillar cavities to demonstrate a single qua... more We report on our advances to use quantum dots in micropillar cavities to demonstrate a single quantum repeater node based on the proposal from Luong et al. [1]. Modern classical cryptography relies on mathematical complexity and is likely to become insecure with future developments in quantum computing. The security in communication can be recovered using quantum communication, whose security is solely based on the laws of physics. Photons, which are used for encoding, change their quantum state upon measurement and thus a possible eavesdropper can be easily detected. Unfortunately, this feature also disables the use of amplifiers in the classical sense, where the signal that lost strength in the channel is measured and re-amplified to cover bigger distances. To circumvent the problem of amplification while enabling the possibility to cover large distances the concept of a quantum repeater [2] was introduced. Recently, several groups demonstrated in a proof of principle experiment t...

Infrared Remote Sensing and Instrumentation XXVII, 2019

For many quantum-photonic applications highly efficient and fast single-photon detectors are of u... more For many quantum-photonic applications highly efficient and fast single-photon detectors are of utmost importance. Resonant tunneling diode (RTD) photodetectors can be operated as low-noise and high-speed amplifiers of small optically generated electrical signals. For this purpose, RTD photodetectors exploit that the tunneling current is extremely sensitive to changes in the local electrostatic potential, which enables the detection of single photogenerated minority charge carriers, and hence the detection of single photons with the capability of photon-number resolution. Here, we present different RTD device geometries and operation schemes for enhanced quantum-efficiency and operation frequencies.

2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2021

Single self-assembled quantum dots are established emitters of single photons and entangled photo... more Single self-assembled quantum dots are established emitters of single photons and entangled photon pairs. The entanglement of photons generated by quantum dots has been shown in polarization [1] , in time bin [2] , and also as hyperentanglement [3] . However, the achievable degree of entanglement and readiness of the source for use in quantum communication protocols, depend on several additional functionalities such as high collection efficiency, coherence of the emitted photon pairs, and fabrication scalability.