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quant-ph2026
Perturbation theory for quantum information quantities of Gaussian states
Zihao Gong, Saikat Guha
Many quantum-information tasks can benefit from Gaussian quantum resources, while their fundamental performance limits are characterized by quantum information quantities. However,…
quant-ph2026
No-Go Theorem for Ancilla-Assisted Gaussian Enhancement in Passive-Unitary Estimation
Zihao Gong, Saikat Guha
We study the maximum quantum Fisher information (QFI) for estimating a single parameter embedded in a generic multimode lossless passive Gaussian unitary using general Gaussian pro…
quant-ph2026
Quantum-enhanced Network Tomography
Yufei Zheng, Zihao Gong, Saikat Guha +1
Network tomography refers to the use of inference techniques for inferring internal network states from end-to-end probes. Quantum probes, implemented by sending blocks of cohe…