Remote control for quantum emitters

To technically exploit the properties of quantum physics, quantum objects and their interactions must be controlled precisely. In many cases, this is done using light. Researchers at the University of Innsbruck and the Institute of Quantum Optics and Quantum Information (IQOQI) of the Austrian Academy of Sciences have now developed a method to address quantum emitters using individually prevalent light pulses.

“It is important not only to personally read the controls and the position of the emitters,” Oriole Romero-Isart says, “but also to do so while leaving the system as possible.”

Romero-Isart’s research group, together with Juan Jose Garcia-Ripoll (partner of IQOQI) from the Instituto de Física Fundamentals in Madrid, have now investigated how to use specially engineered pulses to focus light on a single quantum emitter Can be done for

Self compressing light pulse

“Our proposal is based on light pulses,” explains the first author of the research paper, Sylvia Casullerus. “The frequency of these light pulses is time-dependent.” So, similar to birds chirping, the frequency of the signal changes over time. In structures with certain electromagnetic properties — such as waveguides — propagate frequencies at different speeds.

“If you set the initial conditions of the light pulse correctly, the pulse compresses itself over a certain distance,” explains Patrick Maurer from the Innsbruck team. “Another important part of our work was to show that the pulse enables the control of individual quantum emitters.”

This approach can be used as a kind of remote control to detect, for example, individual superconducting quantum bits in a wavelet or an atom near a photonic crystal.

A wide range of applications

In his work, now published in Physical Review Letters, scientists point out that this method works not only with light or electromagnetic pulses, but also with other waves such as lattice oscillations (phonons) or magnetic stimuli (magnons). Does.

The research group, led by Innsbruck experimental physicist Gerhard Kirkmeier, along with the team of theorists, wants to apply the concept to superconducting qubits in the laboratory.

“Our proposal is based on light pulses,” explains the first author of the research paper, Sylvia Casullerus. “The frequency of these light pulses is time-dependent.” So, similar to birds chirping, the frequency of the signal changes over time. In structures with certain electromagnetic properties – such as waveguides – frequencies propagate at different speeds.

“If you set the initial conditions of the light pulse correctly, the pulse compresses itself over a certain distance,” explains Patrick Maurer from the Innsbruck team.

“Another important part of our work was to show that the pulse enables the control of individual quantum emitters.” This approach can be used as a kind of remote control to detect, for example, individual superconducting quantum bits in a wavelet or an atom near a photonic crystal.

A wide range of applications

In his work, now published in Physical Review Letters, scientists point out that this method works not only with light or electromagnetic pulses, but also with other waves such as lattice oscillations (phonons) or magnetic stimuli (magnons). Does.

The research group, led by Innsbruck experimental physicist Gerhard Kirkmeier, along with the team of theorists, wants to apply the concept to superconducting qubits in the laboratory.

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