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Published on: May 30, 2014
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.
Abstract:
The tomography of photonic quantum states is key in quantum optics, impacting quantum sensing, computing, and communication. Conventional detectors are limited in their temporal and spatial resolution, hampering high-rate quantum communication and local addressing of photonic circuits. Here, we propose to utilize free electron-photon interactions for quantum state tomography, introducing electron homodyne detection with potential for femtosecond-temporal and nanometer-spatial resolutions. The detectable quantum information level depends on the electron-photon interaction strength. Our Letter opens avenues for free-electron-based photodetection utilizing the ultrafast, subwavelength, nondestructive nature of free electrons.
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