Demonstrating efficient and robust bosonic state reconstruction via optimized excitation counting
arxiv(2024)
摘要
Quantum state reconstruction is an essential element in quantum information
processing. However, efficient and reliable reconstruction of non-trivial
quantum states in the presence of hardware imperfections can be challenging.
This task is particularly demanding for high-dimensional states encoded in
continuous-variable (CV) systems, as many error-prone measurements are needed
to cover the relevant degrees of freedom of the system in phase space. In this
work, we introduce an efficient and robust technique for optimized
reconstruction based on excitation number sampling (ORENS). We use a standard
bosonic circuit quantum electrodynamics (cQED) setup to experimentally
demonstrate the robustness of ORENS and show that it outperforms the existing
cQED reconstruction techniques such as Wigner tomography and Husimi Q-function.
Our investigation highlights that ORENS is naturally free of parasitic system
dynamics and resilient to decoherence effects in the hardware. Finally, ORENS
relies only on the ability to accurately measure the excitation number of the
state, making it a versatile and accessible tool for a wide range of CV
platforms and readily scalable to multimode systems. Thus, our work provides a
crucial and valuable primitive for practical quantum information processing
using bosonic modes.
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