9 citations · 26 across the 13 of their papers we have counts for
13 papers
Ground- and excited-state energies extraction via Trotterization on IBM quantum computers
Fernando Espinoza-Ortiz, Chungwei Lin, Chih-Chun Chien
We implement the Hadamard test with Trotterized time-evolution operators on IBM quantum computers to simultaneously extract ground- and excited-state energies of the transverse fie…
Spatial and particle-particle entanglement in 1D quantum walks of two distinguishable or indistinguishable bosonic particles
Christopher Mastandrea, Chih-Chun Chien
We present entanglement measures between spatially separated regions and between two distinguishable or indistinguishable particles in one-dimensional two-particle continuous-time…
Geometry near rank-changing points on the mixed-state manifold: Bures metric, conical singularities, and Lindblad dynamics
Yu-Huan Huang, Xu-Yang Hou, Hao Guo +1
We elucidate the Bures metric in quantum state space near a rank-changing point of the density matrix and show contrasting behavior for two-level () systems versus higher-leve…
Intermediate-temperature topological Uhlmann phase on IBM quantum computers
Christopher Mastandrea, Costin Iancu, Hao Guo +1
A spin-1 system can exhibit an intermediate-temperature topological regime with a quantized Uhlmann phase sandwiched by topologically trivial low- and high-temperature regimes. We…
Uhlmann and scalar Wilczek-Zee phases of degenerate quantum systems
Xin Wang, Hao Guo, Chih-Chun Chien
The Wilczek-Zee (WZ) holonomy arises in degenerate states while the Uhlmann holonomy characterizes finite-temperature topology. We investigate possible relationships between the Uh…
Time-optimal single-scalar control on a qubit of unitary dynamics
Chungwei Lin, Qi Ding, Petros T. Boufounos +4
Optimal control theory is applied to analyze the time-optimal solution with a single scalar control knob in a two-level quantum system without quantum decoherence. Emphasis is \cha…
Mixed-state geometric phases of coherent and squeezed spin states
Xin Wang, Jia-Chen Tang, Xu-Yang Hou +2
Two mixed-state geometric phases, known as the Uhlmann phase and interferometric geometric phase (IGP), of spin coherent states (CSSs) and spin squeezed states (SSSs) are analyzed.…
Third quantization with Hartree approximation for open-system bosonic transport
Fernando Espinoza-Ortiz, Chih-Chun Chien
The third quantization (3rd Q) for bosons provides the exact steady-state solution of the Lindblad equation with quadratic Hamiltonians. By decomposing the interaction of the Bose…
Robustness and classical proxy of entanglement in variants of quantum walk
Christopher Mastandrea, Chih-Chun Chien
Quantum walk (QW) utilizes its internal quantum states to decide the displacement, thereby introducing single-particle entanglement between the internal and positional degrees of f…
Uhlmann quench and geometric dynamic quantum phase transition of mixed states
Jia-Chen Tang, Xu-Yang Hou, Zheng Zhou +2
Dynamic quantum phase transitions (DQPT) following quantum quenches exhibit singular behavior of the overlap between the initial and evolved states. Here we present a formalism to…
Breaking and trapping Cooper pairs by Rydberg-molecule spectroscopy in atomic Fermi superfluids
Chih-Chun Chien, Simeon I. Mistakidis, Hossein R. Sadeghpour
We propose a spectroscopic probe of the breaking and localization of Cooper pairs in an atomic Fermi superfluid interacting with a Rydberg impurity. This is achieved by monitoring…
Sjqvist quantum geometric tensor of finite-temperature mixed states
Zheng Zhou, Xu-Yang Hou, Xin Wang +3
The quantum geometric tensor (QGT) reveals local geometric properties and associated topological information of quantum states. Here a generalization of the QGT to mixed quantum st…
Interferometric Geometric Phases of -symmetric Quantum Mechanics
Xin Wang, Zheng Zhou, Jia-Chen Tang +3
We present a generalization of the geometric phase to pure and thermal states in -symmetric quantum mechanics (PTQM) based on the approach of the interferometric geom…