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Photonic Quantum State Tomography Using Free Electrons.

Alexey Gorlach1, Salomon Malka1, Aviv Karnieli2

  • 1Solid State Institute, <a href="https://ror.org/03qryx823">Technion-Israel Institute of Technology</a>, Haifa 32000, Israel.

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We introduce electron homodyne detection for quantum state tomography, overcoming limitations of conventional detectors. This method uses free electron-photon interactions for high-resolution measurements in quantum optics.

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Area of Science:

  • Quantum optics and information science.
  • Advanced measurement techniques for quantum systems.

Background:

  • Photonic quantum state tomography is crucial for quantum technologies like sensing, computing, and communication.
  • Current detectors face limitations in temporal and spatial resolution, hindering high-rate quantum communication and precise photonic circuit control.

Purpose of the Study:

  • To propose a novel method for quantum state tomography using free electron-photon interactions.
  • To introduce electron homodyne detection as a technique with potential for unprecedented resolution.

Main Methods:

  • Utilizing the interaction between free electrons and photons for quantum state characterization.
  • Developing electron homodyne detection for high-resolution measurements.

Main Results:

  • Demonstrated potential for femtosecond temporal and nanometer spatial resolutions in photodetection.
  • Established that detectable quantum information levels are contingent on electron-photon interaction strength.

Conclusions:

  • Electron homodyne detection offers a promising new pathway for photodetection.
  • The ultrafast, subwavelength, and nondestructive nature of free electrons can be leveraged for advanced quantum measurements.