Generation, manipulation and detection of single photons
Abstract: We develop quantum devices to enable the implementation of quantum technologies based on controlling light at the single photon level. Future quantum communication, computation and sensing will require high-performance quantum devices able to generate and detect light one photon at a time. Schemes to manipulate light on-chip, based on integrated photonics are also carried out in our group. Our single photon sources based on semiconductor quantum dots can generate single photons as well as entangled photon pairs at telecom wavelengths to enable implementation of long distance quantum communication. We operate a quantum network made of deployed optical fibers in the Stockholm area and demonstrate single photon transmission and quantum key generation over 34 km. Single photon detectors with high detection efficiency, low noise and high time resolution are major enabling techniques, our spinoff company Single Quantum develops superconducting nanowire single photon detectors with applications in quantum communication, integrated quantum circuits as well as for lidar and quantum microscopy. We will discuss these applications along with the specific detector requirements for technologies based on single photon detection. Further improvements in terms of time resolution, photon number resolution and extended detection ranges will also be discussed. Quantum technology brings together academic research and entrepreneurship and offers exciting potentials to the early adopters who will build strong synergies.
Bio: Val got his PhD from Lund University, Sweden in 2001 on the generation of single photons with quantum dot devices. He was a postdoc at the Humboldt University in Berlin Germany, an assistant at EPFL in Lausanne, Switzerlands, ober-assistant at ETH Zurich in Switzerland before starting his group at TU Delft in the Netherlands in 2005 on single photon technology. Val moved to KTH Stockholm, Sweden in 2015 to lead the Quantum Nano Photonics group as a full professor. Val co-founded Single Quantum BV in 2012 to develop high-performance single photon detectors and Quantum Scopes AB in 2021 to develop quantum instruments.