Modeling Quantum Devices and the Reconstruction of Physics in Practical Systems

Area of Science:

• Quantum physics
• Quantum device modeling

Background:

• Accurate modeling of quantum devices is crucial for understanding experimental results.
• Current limitations in experimental operations often prevent precise identification of the device's physical model.

Purpose of the Study:

• To investigate the conditions necessary for correctly reconstructing the physical model of a quantum device.
• To determine the experimental requirements for unambiguous quantum device characterization.

Main Methods:

• Analysis of quantum theory constraints on model identification.
• Identification of sufficient conditions for model reconstruction based on experimental operations.
• Exploration of requirements involving quantum states, measurements, and evolution operators.

Main Results:

• Standard experimental efforts with limited operations are often insufficient to uniquely identify the device's physical model.
• Sufficient conditions for correct model reconstruction involve either a specific set of pure states and projective measurements or a set of evolution operators capable of generating all unitary operators.

Conclusions:

• Unambiguous quantum device modeling necessitates carefully chosen experimental setups.
• Achieving accurate physical model identification requires either comprehensive state/measurement preparation or a universal set of quantum gates.