7 citations · 15 across the 10 of their papers we have counts for
10 papers
Modular-Annihilator Parent Hamiltonians for Purified Gibbs States: Spectral Design and Controlled Approximation
Changhao Yi, Jun Takahashi, Cunlu Zhou
Purified Gibbs states provide a bridge between finite-temperature physics, dissipative dynamics, and ground-state methods. In this work, we study the exact finite sum-of-squares (S…
Certifying unknown-basis pure-state entanglement dimensionality with few measurement settings
Changhao Yi
We introduce a basis-independent algorithm that only uses single-copy measurements to certify the Schmidt number of -qubit bipartite pure states. Assuming the local system dime…
A Symmetry-Enabled Direct Quantum Protocol for Many-Body Green's Functions
Changhao Yi, Cunlu Zhou
We present a symmetry-enabled direct quantum protocol for computing many-body Green's functions, a central tool for studying strongly correlated quantum systems. Our protocol relie…
Certifying entanglement dimensionality by -reduction moments
Changhao Yi, Xiaodi Li, Huangjun Zhu
In this paper, we combine the k-reduction map, the moment method, and the classical shadow method into a practical protocol for certifying the entanglement dimensionality. Our appr…
Optimal estimation of three parallel spins with genuine and restricted collective measurements
Changhao Yi, Kai Zhou, Zhibo Hou +2
Collective measurements on identical and independent quantum systems can offer advantages in information extraction compared with individual measurements. However, little is known…
Third moments of qudit Clifford orbits and 3-designs based on magic orbits
Huangjun Zhu, Chengsi Mao, Changhao Yi
When the local dimension is an odd prime, the qudit Clifford group is only a 2-design, but not a 3-design, unlike the qubit counterpart. This distinction and its extension to C…
Nearly query-optimal classical shadow estimation of unitary channels
Zihao Li, Changhao Yi, You Zhou +1
Classical shadow estimation (CSE) is a powerful tool for learning the properties of quantum states and quantum processes. Here we consider the CSE task for quantum unitary channels…
Qudit Shadow Estimation Based on the Clifford Group and the Power of a Single Magic Gate
Chengsi Mao, Changhao Yi, Huangjun Zhu
Shadow estimation is a sample-efficient protocol for learning the properties of a quantum system using randomized measurements, but the current understanding of qudit shadow estima…
Faster Randomized Dynamical Decoupling
Changhao Yi, Leeseok Kim, Milad Marvian
We present a randomized dynamical decoupling (DD) protocol that can improve the performance of any given deterministic DD, by using no more than two additional pulses. Our construc…
Experimental Realization of Genuine Three-copy Collective Measurements for Optimal Information Extraction
Kai Zhou, Changhao Yi, Wen-Zhe Yan +5
Nonclassical phenomena tied to entangled states are the focus of foundational studies and powerful resources in many applications. By contrast, the counterparts in quantum measurem…