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9 papers · 2 filters
Transfer and storage of qubits in the presence of decoherence
Kelly R. Patton, Uwe R. Fischer
The effects of decoherence on the transfer and storage of coherent quantum states in hybrid systems are studied within the Caldeira-Leggett approach. In general, we find that a hig…
Quantum teleportation between "particle-like" and "field-like" qubits using hybrid entanglement under decoherence effects
Kimin Park, Seung-Woo Lee, Hyunseok Jeong
We study quantum teleportation between two different types of optical qubits, one of which is "particle-like" and the other "field-like," via hybrid entangled states under the effe…
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…
Optimality for indecomposable entanglement witnesses
Kil-Chan Ha, Seung-Hyeok Kye
We examine various notions related with the optimality for entanglement witnesses arising from Choi type positive linear maps. We found examples of optimal entanglement witnesses w…
Production of entanglement with highly-mixed states
Minsu Kang, M. S. Kim, Hyunseok Jeong
We study production of entanglement with highly-mixed states. We find that entanglement between highly mixed states can be generated via a direct unitary interaction even when both…