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Engineering superposition states and tailored probes for nanoresonators via open-loop control.

Kurt Jacobs¹, Lin Tian, Justin Finn

¹Department of Physics, University of Massachusetts at Boston, 100 Morrissey Boulevard, Boston, Massachusetts 02125, USA.

Physical Review Letters

|March 5, 2009

Summary

This summary is machine-generated.

Researchers demonstrate preparing nanoresonators in quantum superposition states using qubit monitoring. This novel method, utilizing open-loop control, works even with thermal states and avoids complex nonlinearities, paving the way for quantum nanosystem advancements.

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Area of Science:

Quantum physics
Nanoscience
Quantum information science

Background:

Mesoscopic superposition states are crucial for quantum technologies.
Preparing these states in nanomechanical systems is challenging.
Existing methods often require complex nonlinear interactions.

Purpose of the Study:

To demonstrate a novel method for preparing nanoresonators in mesoscopic superposition states.
To show the efficacy of monitoring a coupled qubit for state engineering.
To investigate the role of open-loop control in quantum nanosystems.

Main Methods:

Coupling a qubit to the square of the nanoresonator's position.
Utilizing an open-loop control protocol derived from optimal control theory.
Simulating the preparation process, including environmental noise effects.

Main Results:

Successfully prepared nanoresonators in mesoscopic superposition states from thermal initial states.
The method does not require third-order nonlinearity.
Open-loop control effectively engineered the desired quantum states.

Conclusions:

Open-loop control is a powerful tool for state engineering in quantum nanosystems.
This method offers a simpler alternative for creating superposition states in nanoresonators.
The findings advance the control and measurement capabilities in quantum nanoscience.