Dual-Path Methods for Propagating Quantum Microwaves

  1. R. Di Candia,
  2. E. P. Menzel,
  3. L. Zhong,
  4. F. Deppe,
  5. A. Marx,
  6. R. Gross,
  7. and E. Solano
We study quantum state tomography, entanglement detection, and channel noise reconstruction of propagating quantum microwaves via dual-path methods. The presented schemes make use of the following key elements: propagation channels, beam splitters, linear amplifiers, and field quadrature detectors. Remarkably, our methods are tolerant to the ubiquitous noise added to the signals by phase-insensitive microwave amplifiers. Furthermore, we analyze our techniques with numerical examples and experimental data. Our methods provide key toolbox components that may pave the way towards quantum microwave teleportation and communication protocols.
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