A new technique based on advanced camera technology demonstrates a rapid and efficient way to reconstruct the full quantum state of entangled particles. Researchers from the University of Ottawa, working together with Danilo Zia and Fabio Sciarrino from the Sapienza University of Rome, have recen
in short. With the standard approaches , a full tomography requires large number of measurements that rapidly increase with the system’s complexity .
The projective measurement approach to quantum tomography can be thought of as looking at the shadows of aobject projected on different walls from independent directions. All a researcher can see is the shadows, and from them, they can infer the shape of the full object. For instance, in a CT scan , the information of a 3D object can thus be reconstructed from a set of 2D images.
The team, led by Ebrahim Karimi, Canada Research Chair in Structured Quantum Waves, co-director of uOttawa Nexus for Quantum Technologies research institute and associate professor in the Faculty of Science, extended this concept to the case of two photons. Reconstructing a biphoton state requires superimposing it with a presumably well-known quantum state, and then analyzing the spatial distribution of the positions where two photons arrive simultaneously.
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