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F67: Transduction for Quantum Networks

Room 412

Sponsoring Units: DQIChair: Zhaoyou Wang, Stanford UniversitySession Type:
  • Focus

Tue. March 7, 8:48 a.m. – 9:00 a.m. PST

Room 412

A distributed quantum computing system requires to share information between spatially separated quantum processors by creating a quantum channel, which can be implemented by emitting a microwave photon from a sender processor and absorbing it by a receiver processor. For this purpose, deterministically encoding the state of a stationary qubit into a travelling photon is of great interest. Here we introduce a superconducting circuit consisting of a data qubit and an emitter qubit coupled to a quantum channel, with a coupler between them to parametrically exchange quantum state. With this structure, we demonstrate the deterministic transfer of a qubit state into a propagating microwave photon with a single-rail encoding, with a process fidelity in excess of 90%. We use a time-dependent parametric drive to shape the temporal profile of the propagating mode to be time-symmetric and with a constant phase so that the absorption process by the receiver can be implemented as a time-reversed version of the emission. Compared with previous works which utilize a second-order transition to control the emission, the presented technique uses a first-order parametric process, which requires no strong pump and can therefore help eliminate AC Stark shifts and heating of the data qubit. It offers ease of calibration and flexibility in fine-tuning photon emission and absorption, and can therefore facilitate high-fidelity quantum state transfer and remote entanglement operations in a distributed quantum computing system. 

Presented By

  • Jiaying Yang (Chalmers University of Technology)


  • Jiaying Yang (Chalmers University of Technology)
  • Axel Eriksson (Chalmers Univ of Tech)
  • Aamir Mohammed Ali (Chalmers Univ of Tech)
  • Ingrid Strandberg (Chalmers Univ of Tech)
  • Claudia Castillo Moreno (Chalmers Univ of Tech)
  • Daniel Perez Lozano (Interuniversity Microelectronics Centre)
  • Per Delsing (Chalmers Univ of Tech)
  • Per Persson (Ericsson AB)
  • Simone Gasparinetti (Chalmers Univ of Tech)