Analytical View on Non-invasive Measurement of Moving Charge by Various Topologies of Wannier Qubit

Conference paper
Part of the Lecture Notes in Networks and Systems book series (LNNS, volume 283)


Detection of moving charge in free space is presented in the framework of single electron CMOS devices. It opens the perspective for construction of new type detectors for beam diagnostic in accelerators. General phenomenological model of noise acting on position based qubit implemented in semiconductor quantum dots is given in the framework of simplistic tight-binding model. At first linear position-based qubit also known as Wannier qubit is considered with the situation of being excited by external movement of charged particle in its proximity. Analytical formulas describing the change of qubit state are derived analytically. In the next steps the roton semiconductor qubit representing closed loop of coupled quantum dots is given and the effect of external moving charge on the change of qubit state is determined by analytical formulas. Roton qubit physical state can be controlled by external magnetic and electric field what is the extension of controlling mechanism in comparison with linear Wannier qubit, when we have N quantum dots aligned.


Weak measurement Linear and circular Wannier qubits Tight-binding model 



I would like to thank to M.Sc. Marcin Piontek (University of Lodz) and to PhD Marcin Kowalik (Rzeszow University of Technology) for their assistance in schemes graphical upgrade.


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© The Author(s), under exclusive license to Springer Nature Switzerland AG 2022

Authors and Affiliations

  1. 1.Cracow University of Technology, Faculty of Computer Science and Telecommunications, Department of Computer ScienceKrakówPoland
  2. 2.Quantum Hardware SystemsŁódźPoland

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