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4 papers · 1 filter
Entanglement between Collective Operators in a Linear Harmonic Chain
Johannes Kofler, Vlatko Vedral, Myungshik S. Kim +1
We investigate entanglement between collective operators of two blocks of oscillators in an infinite linear harmonic chain. These operators are defined as averages over local opera…
Quantum Key Distribution with Blind Polarization Bases
Won-Ho Kye, Chil-Min Kim, M. S. Kim +1
We propose a new quantum key distribution scheme that uses the blind polarization basis. In our scheme the sender and the receiver share key information by exchanging qubits with a…
Greenberger-Horne-Zeilinger Nonlocality in Arbitrary Even Dimensions
Jinhyoung Lee, Seung-Woo Lee, M. S. Kim
We generalize Greenberger-Horne-Zeilinger (GHZ) nonlocality to every even-dimensional and odd-partite system. For the purpose we employ concurrent observables that are incompatible…
Completely-Positive Non-Markovian Decoherence
Jinhyoung Lee, Inbo Kim, Helen McAneney +2
We propose an effective Hamiltonian approach to investigate decoherence of a quantum system in a non-Markovian reservoir, naturally imposing the complete positivity on the reduced…