Chang‐shui Yu

Stronger uncertainty relations with improvable upper and lower bounds

2016 · arXiv (Cornell University)

We utilize quantum superposition principle to establish the improvable upper and lower bounds on the stronger uncertainty relation, i.e., the "weighted-like" sum of the variances of observables. Our bounds include some free parameters which not …

Circuit QED: Cross-Kerr-effect induced by a superconducting qutrit without classical pulses

2016 · arXiv (Cornell University)

The realization of cross-Kerr nonlinearity is an important task for many applications in quantum information processing. In this work, we propose a method for realizing cross-Kerr nonlinearity interaction between two superconducting coplanar waveguide resonators coupled …

Quantum speed limit for the maximum coherent state under the squeezed environment*

2021 · Chinese Physics B

The quantum speed limit time for quantum system under squeezed environment is studied. We consider two typical models, the damped Jaynes–Cummings model and the dephasing model. For the damped Jaynes–Cummings model under squeezed environment, we …

Optimal convex approximations of qubit states under Pauli distance

2024 · Laser Physics

Abstract Utilizing the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mrow> <mml:msub> <mml:mi>l</mml:mi> <mml:mn>1</mml:mn> </mml:msub> </mml:mrow> </mml:mrow> </mml:math> norm as the quantum state distance metric, we consider the Pauli distance of arbitrary target quantum states, that is, the …