Research

Our research encompasses many aspects of material science, nanophotonics, and quantum optics. One of our primary goals is to localize and engineer new types of solid-state optically active spin qubits and interface them with nanoscale photonic structures to utilize them for quantum networking and computing applications.

Optically active spin qubits

We explore different material platforms (see below) capable of hosting quantum emitters with access to spin states, design and fabricate nanophotonic structures, including on-chip integrated circuits, and perform quantum optics experiments to validate their usability as qubits and sources of entangled photonic states for quantum networking and quantum computing applications.

Rare earth ions

S. Ourari, Ł. Dusanowski, S. P. Horvath, M. T. Uysal, C. M. Phenicie, P. Stevenson, M. Raha, S. Chen, R. J. Cava, N. P. de Leon, J. D. Thompson, Nature 620, 977–981 (2023)

Quantum dots

Ł. Dusanowski, C. Nawrath, S. L. Portalupi, M. Jetter, T. Huber, S. Klembt, P. Michler, S. Höfling, "Optical charge injection and coherent control of a quantum-dot spin-qubit emitting at telecom wavelengths", Nature Communications, 13, 748 (2022).

Defects in monolayers

L. N. Tripathi, O. Iff, S. Betzold, Ł. Dusanowski, M. Emmerling, K. Moon, Y. J. Lee, S.-H. Kwon, S. Höfling, and C. Schneider, "Spontaneous Emission Enhancement in Strain-Induced WSe2 Monolayer-Based Quantum Light Sources on Metallic Surfaces", ACS Photonics 5, 1919 (2018).

Quantum networks

One of our aims is to use single photons and spin states as qubits to establish quantum links between them. For that purpose, we engineer spin-photon interfaces to access both optical and spin transitions, which allow us to manipulate spin states, including initialization and single-shot readout, generate indistinguishable single photons, and ultimately form entanglement between photon and spin, critical for quantum network applications.

Quantum state tomography of entangled Er ion spin and photon-time-bin state

M. T. Uysal*, Ł. Dusanowski*, H. Xu*, S. P. Horvath, S. Ourari, R. J. Cava, N. P. de Leon, J. D. Thompson, "Spin-photon entanglement of a single Er3+ ion in the telecom band", arXiv: 2406.06515 (2024).

Er ion single-shot spin readout and indistinguishable single photon generation

S. Ourari, Ł. Dusanowski, S. P. Horvath, M. T. Uysal, C. M. Phenicie, P. Stevenson, M. Raha, S. Chen, R. J. Cava, N. P. de Leon, J. D. Thompson, Nature 620, 977–981 (2023)

Coherent control of quantum dot spin

Integrated quantum photonic circuits

Envisioned integrated quantum photonic circuit with multiple quantum active spin qubits coupled to cavities and interconnected with ridge waveguides, directional couplers and other on chip functionalities.

Scalable quantum photonic technologies require the low-loss integration of many quantum emitters and spins. One of our group's main themes is the on-chip integration of optically active spin qubits with photonic circuits toward fully scalable integrated quantum technologies. Below are a few examples of our previous work in this area.

InAs/GaAs quantum dots integrated with on-chip resonators

Ł. Dusanowski, D. Köck, E. Shin, S.-H. Kwon, C. Schneider, and S. Höfling, "Purcell-Enhanced and Indistinguishable Single-Photon Generation from Quantum Dots Coupled to On-Chip Integrated Ring Resonators", Nano Lett. 20, 6357 (2020).

Bondable Si photonic circuits

S. Ourari, Ł. Dusanowski, S. P. Horvath, M. T. Uysal, C. M. Phenicie, P. Stevenson, M. Raha, S. Chen, R. J. Cava, N. P. de Leon, J. D. Thompson, Nature 620, 977–981 (2023)

InAs/GaAs photonic circuits with multiple quantum dots

Ł. Dusanowski, D. Köck, C. Schneider, S. Höfling, "On-chip Hong-Ou-Mandel interference from separate quantum dot emitters in an integrated circuit", ACS Photonics, 10, 8, 2941 (2023)

Nanophotonics

All our research is enabled by utilizing various photonic structures coupled to quantum emitters. In particular, in our lab, we design and fabricate devices such as cavities, waveguides, and grating couplers. For that purpose, we use standard techniques such as e-beam lithography and dry/wet etching, and more exotic ones such as focus ion beam milling. In the figure on the left, you can see a few examples of devices fabricated by our group members.

Exotic topological materials

M. Syperek, R. Stühler, A. Consiglio, P. Holewa, P. Wyborski, Ł. Dusanowski, F. Reis, S. Höfling, R. Thomale, W. Hanke, R. Claessen, D. Di Sante, C. Schneider, Nature Communications, 13, 6313 (2022)

Physics of excitons confined in exotic materials, such as monolayer of Bi on SiC, which has been established as a large-gap, two-dimensional quantum spin Hall insulator.

Strong light-matter interactions

N. Lundt, Ł. Dusanowski, E. Sedov, P. Stepanov, M. M. Glazov, S. Klembt, M. Klaas, J. Beierlein, Y. Qin, S. Tongay, M. Richard, A. V. Kavokin, S. Höfling, C. Schneider, Nature Nanotechnology 14, 770 (2019).

Interesting physical effects related to the strong coupling of light in a photonic cavity and excitons in quantum wells or monolayers, such as polariton condensates or optical valley Hall effect (left).

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