Laser-free qubit control

R. Srinivas, S. C. Burd, H. M. Knaack +9 more

Lachlan J. Rogers, Fedor Jelezko

Ori Reinhardt, Chen Mechel, Morgan H. Lynch +1 more

Abstract Free‐electron interactions with laser‐driven nearfields can quantize the electrons’ energy spectrum and provide control over this quantized degree of freedom. The study proposes to use such interactions to promote free electrons as carriers of quantum information and show how to create a qubit on a free electron, which holds promise for applications in electron microscopy and spectroscopy. A method to implement the qubit's noncommutative spin algebra, and to control and measure the qubit state with a universal set of 1‐qubit gates is shown. These gates are within the current capabilities of ultrafast transmission electron microscopes. Laser‐driven free‐electron qubits promise configurability by the laser intensity, frequency, and polarizability, simultaneously with high‐resolution temporal control on femtosecond timescales.

Ori Reinhardt, Chen Mechel, Morgan H. Lynch +1 more

Free-electron interactions with laser-driven nanophotonic nearfields can quantize the electrons' energy spectrum and provide control over this quantized degree of freedom. We propose to use such interactions to promote free electrons as carriers of quantum information and find how to create a qubit on a free electron. We find how to implement the qubit's non-commutative spin-algebra, then control and measure the qubit state with a universal set of 1-qubit gates. These gates are within the current capabilities of femtosecond-pulsed laser-driven transmission electron microscopy. Pulsed laser driving promise configurability by the laser intensity, polarizability, pulse duration, and arrival times.

A.P. Danilov, V. G. Chekmachev, Alexander V. Tsukanov

Maxim V. Tsarev, A. Ryabov, Peter Baum

We laser-modulate the electron beam of a transmission electron microscope into qubit states for potential use in free-electron quantum optics.