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7 papers · 2 filters
A quantum algorithm for obtaining the lowest eigenstate of a Hamiltonian assisted with an ancillary qubit system
Jeongho Bang, Seung-Woo Lee, Chang-Woo Lee +1
We propose a quantum algorithm to obtain the lowest eigenstate of any Hamiltonian simulated by a quantum computer. The proposed algorithm begins with an arbitrary initial state of…
Testing genuine multipartite nonlocality in phase space
Seung-Woo Lee, Mauro Paternostro, Jinhyoung Lee +1
We demonstrate genuine three-mode nonlocality based on phase space formalism. A Svetlichny-type Bell inequality is formulated in terms of the -parameterized quasiprobability fun…
Procedures for realizing an approximate universal NOT gate
Jeongho Bang, Seung-Woo Lee, Hyunseok Jeong +1
We consider procedures to realize an approximate universal NOT gate in terms of average fidelity and fidelity deviation. The average fidelity indicates the optimality of operation…
Generating a Schrödinger-cat-like state via a coherent superposition of photonic operations
Chang-Woo Lee, Jinhyoung Lee, Hyunchul Nha +1
We propose an optical scheme to generate a superposition of coherent states with enhanced size adopting an interferometric setting at the single-photon level currently available in…
Operational quasiprobabilities for qudits
Junghee Ryu, James Lim, Sunghyuk Hong +1
We propose an operational quasiprobability function for qudits, enabling a comparison between quantum and hidden-variable theories. We show that the quasiprobability function becom…
Entanglement amplification of fermionic systems in an accelerated frame
Younghun Kwon, Jinho Chang
In this article we present an analysis to derive physical results in the entanglement amplification of fermonic systems in the relativistic regime, that is, beyond the single-mode…