Department of Electrical and Computer Engineering and Solid State Institute, Technion – Israel Institute of Technology, 32000 Haifa, Israel
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Abstrakt
Recent advances in laser interactions with coherent free electrons have enabled to shape the electron’s quantum state. Each electron becomes a superposition of energy levels on an infinite quantized ladder, shown to contain up to thousands of energy levels. We propose to utilize the quantum nature of such laser-driven free electrons as a “synthetic Hilbert space” in which we construct and control qudits (quantum digits). The question that motivates our work is what qudit states can be accessed using electron-laser interactions, and whether it is possible to implement any arbitrary quantum gate. We find how to encode and manipulate free-electron qudit states, focusing on dimensions which are powers of 2, where the qudit represents multiple qubits implemented on the same single electron – algebraically separated, but physically joined. As an example, we prove the possibility to fully control a 4-dimenisonal qudit, and reveal the steps required for full control over any arbitrary dimension. Our work enriches the range of applications of free electrons in microscopy and spectroscopy, offering a new platform for continuous-variable quantum information.
Udvalgt billede: Illustration af det syntetiske Hilbert-rum af en laserdrevet fri elektron.
Populært resumé
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