millikelvin - microwave -photonic probestation

• Subject Area: Optics, Quantum Optics and Physics of Atoms, Molecules and Plasmas ; Experimental Condensed Matter Physics
• Term: since 2022
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 491605905

At the Institute of Physics at University of Münster, hybrid quantum devices are developed for applications in photonic quantum information processing. For fully-fledged quantum communication technologies, versatile emitter and receiver devices comprising quantum light sources and / or detectors are key components. Here, integrated photonic circuits (IQPCs) are arguably one of the most promising platforms to integrate the required functionalities. Moreover, practical implementations demand flexible hybrid architectures which combine the unique strengths of individual components and at the same time avoid individual shortcomings.The requested instrument is a standardized test and development system for source and detection devices to validate the performance of IQPC devices and their individual components. The central apparatus is a photonic probestation equipped with optical fiber ports and microwave connections designed and specified for operation at millikelvin temperatures.The requested instrument will be used for different interconnected research tracks. The first track involves the transduction between the microwave and optical domains. Here for instance microwave surface acoustic wave pulses program single photon states by dynamically modulating integrated quantum emitters or individual photonic circuit elements. Feedbacked control between the microwave and photonic domains enable the implementation and validation of programmable quantum protocols to generate purpose-fit output states from sources. The second track targets modern hybrid IQPC source devices comprising emerging classes of quantum emitters involves for instance hosted in modern 2D semiconductors. In this highly exploratory track, the investigation of the coherent optical and spin properties and the development and optimization of the devices is equally possible. In the third research track, the instrument serves as a benchmarking and validation platform for receivers employing superconducting single photon detectors.The requested system is designed in a fully modular way and allows the straightforward adoption of newly developed standardized methodologies. To this end, individual components are equipped with interfaces to ensure interoperation between different functionalities. Thus, the apparatus can be reconfigured to meet future demands for instance to integrate emerging quantum light sources in different wavelength bands or create bidirectional quantum transduction schemes from stationary microwave superconducting or spin qubits to flying photonic qubits.

• DFG Programme: Major Instrumentation Initiatives
• Major Instrumentation: Arbitrary Waveform Transceiver ; Narrowband tunable laser ; Single photon detection system ; millikelvin microwave photonic probestation
• Instrumentation Group: 5240 Photonenzähler, Quantenphotometer ; 5700 Festkörper-Laser ; 7170 Transientrecorder, digitale Signalspeicher
• Applicant Institution: Universität Münster
• Leader: Professor Dr. Hubert Johannes Krenner
• Co-Investigators: Professor Dr. Rudolf Bratschitsch; Professor Dr. Carsten Schuck; Professorin Dr. Ursula Wurstbauer