Leistungsfähige verschränkte Zustände aus Quantenpunkten

• Antragstellerin: Professorin Dr. Doris Reiter
• Fachliche Zuordnung: Theoretische Physik der kondensierten Materie ; Experimentelle Physik der kondensierten Materie ; Optik, Quantenoptik und Physik der Atome, Moleküle und Plasmen
• Förderung: Förderung von 2020 bis 2025
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 428026575

• Erstellungsjahr: 2024

Zusammenfassung der Projektergebnisse

Communication is about to be revolutionized by the usage of quantum mechanics, known as the second quantum revolution. At the heart of this revolution are the exploitation of entangled states, which do not have any classical analogue. Therefore, the efficient creation of entangled states is crucial in this endeavor and the race of the search for the ideal source of entangled photon pairs is at its peak. The main goal of our project is to bring forward semiconductor quantum dots as usable source of entangled photon pairs. A new angle is added by a fundamentally new ingredient, namely the dark exciton states, for the controlled biexciton generation and subsequently the deterministic generation of time-bin entangled photons. We will consider advanced creation of time-bin entangled photon states, as well as multilevel entanglement and multiphoton entanglement using single quantum dots and quantum dot molecules. We aim to achieve these goals by a strong joint theoretical and experimental effort to turn the potential of quantum dots as entangled photon source into a useful set of tools for quantum communication, eventually leading to the construction of usable quantum repeaters.

Projektbezogene Publikationen (Auswahl)

• Optical Stark shift to control the dark exciton occupation of a quantum dot in a tilted magnetic field. Physical Review B, 104(7).
  Neumann, Miriam; Kappe, Florian; Bracht, Thomas K.; Cosacchi, Michael; Seidelmann, Tim; Axt, Vollrath Martin; Weihs, Gregor & Reiter, Doris E.
  
• Swing-Up of Quantum Emitter Population Using Detuned Pulses. PRX Quantum, 2(4).
  Bracht, Thomas K.; Cosacchi, Michael; Seidelmann, Tim; Cygorek, Moritz; Vagov, Alexei; Axt, V. Martin; Heindel, Tobias & Reiter, Doris E.
  
• SUPER Scheme in Action: Experimental Demonstration of Red-Detuned Excitation of a Quantum Emitter. Nano Letters, 22(16), 6567-6572.
  Karli, Yusuf; Kappe, Florian; Remesh, Vikas; Bracht, Thomas K.; Münzberg, Julian; Covre, da Silva Saimon; Seidelmann, Tim; Axt, Vollrath Martin; Rastelli, Armando; Reiter, Doris E. & Weihs, Gregor
  
• Collective excitation of spatio-spectrally distinct quantum dots enabled by chirped pulses. Materials for Quantum Technology, 3(2), 025006.
  Kappe, Florian; Karli, Yusuf; Bracht, Thomas K.; Covre, da Silva Saimon Filipe; Seidelmann, Tim; Axt, Vollrath Martin; Rastelli, Armando; Weihs, Gregor; Reiter, Doris E. & Remesh, Vikas
  
• Compact chirped fiber Bragg gratings for single-photon generation from quantum dots. APL Photonics, 8(10).
  Remesh, Vikas; Krämer, Ria G.; Schwarz, René; Kappe, Florian; Karli, Yusuf; Siems, Malte Per; Bracht, Thomas K.; Covre, da Silva Saimon Filipe; Rastelli, Armando; Reiter, Doris E.; Richter, Daniel; Nolte, Stefan & Weihs, Gregor
  
• Dressed-state analysis of two-color excitation schemes. Physical Review B, 107(3).
  Bracht, Thomas K.; Seidelmann, Tim; Karli, Yusuf; Kappe, Florian; Remesh, Vikas; Weihs, Gregor; Axt, Vollrath Martin & Reiter, Doris E.
  
• Theory of time-bin-entangled photons from quantum emitters. Physical Review A, 110(6).
  Bracht, Thomas K.; Kappe, Florian; Cygorek, Moritz; Seidelmann, Tim; Karli, Yusuf; Remesh, Vikas; Weihs, Gregor; Axt, Vollrath Martin & Reiter, Doris E.
  
• Keeping the photon in the dark: Enabling quantum dot dark state control by chirped pulses and magnetic fields. Science Advances, 11(28).
  Kappe, Florian; Schwarz, René; Karli, Yusuf; Bracht, Thomas; Axt, Vollrath M.; Covre, da Silva Saimon F.; Rastelli, Armando; Remesh, Vikas; Reiter, Doris E. & Weihs, Gregor