5 papers
Adaptive thresholding for scalable measurement-based qubit reset
Qian Cao, Unnati Akhouri, Samuel Vizvary +3
Fast, high-fidelity qubit initialization is a key primitive for scalable quantum information processing, but conventional reset protocols either require long relaxation times or di…
Mixed-State Symmetry-Protected Topology and Strong-to-Weak Spontaneous Symmetry Breaking in a Superconducting Qubit Array
Qian Cao, Zhen Bi, Kater W. Murch
We experimentally investigate how symmetry-protected topological order in a one-dimensional cluster state is transformed by measurement and decoherence in a five-qubit superconduct…
Measurement and Control of the Complex Berry Phase in a Quantum System
Pratik J. Barge, Qian Cao, Niklas Hörnedal +2
The Berry phase is a geometric phase acquired during adiabatic evolution over a closed loop in parameter space. It plays an essential role in geometric quantum gates and other phas…
Frequency super-resolution with quantum environment engineering in a weakly coupled nuclear-spin system
Tianzi Wang, Qian Cao, Peng Du +1
Optical super-resolution has been widely employed to beat spatial diffraction limit, which is often stated by Abbe-Rayleigh criterion. Analogously, we propose a frequency super-res…
Control of free induction decay with quantum state preparation in a weakly coupled multi-spin system
Qian Cao, Tianzi Wang, Wenxian Zhang
Nuclear magnetic resonance (NMR) has been a widely used tool in various scientific fields and practical applications, with quantum control emerging as a promising strategy for syne…