48 citations · 133 across the 5 of their papers we have counts for
9 papers · 1 filter
Entanglement, Berry Phases, and Level Crossings for the Atomic Breit-Rabi Hamiltonian
Sangchul Oh, Zhen Huang, Uri Peskin +1
The relation between level crossings, entanglement, and Berry phases is investigated for the Breit-Rabi Hamiltonian of hydrogen and sodium atoms, describing a hyperfine interaction…
Quantum phase transitions, entanglement, and geometric phases of two qubits
Sangchul Oh
The relation between quantum phase transitions, entanglement, and geometric phases is investigated with a system of two qubits with XY type interaction. A seam of level crossings o…
Quantum Computational Method of Finding the Ground State Energy and Expectation Values
Sangchul Oh
We propose a new quantum computational way of obtaining a ground-state energy and expectation values of observables of interacting Hamiltonians. It is based on the combination of t…
Entanglement between qubits induced by a common environment with a gap
Sangchul Oh, Jaewan Kim
We study a system of two qubits interacting with a common environment, described by a two-spin boson model. We demonstrate two competing roles of the environment: inducing entangle…
Entanglement of an impurity and conduction spins in the Kondo model
Sangchul Oh, Jaewan Kim
Based on Yosida's ground state of the single-impurity Kondo Hamiltonian, we study three kinds of entanglement between an impurity and conduction electron spins. First, it is shown…
Quantum Separability of Thermal Spin One Boson Systems
Jae-Weon Lee, Sangchul Oh, Jaewan Kim
Using the temperature Green's function approach we investigate entanglement between two non-interacting spin 1 bosons in thermal equilibrium. We show that, contrary to the fermion…