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43 papers · 1 filter
Necessity of macroscopic operation for the creation of superpositions of macroscopically distinct states
Tomoyuki Morimae
We consider the creation of superpositions of macroscopically distinct states by a completely-positive (CP) operation on a subsystem. We conclude that the subsystem on which the CP…
Existence and nonexistence of an intrinsic tunneling time
Gonzalo Ordonez, Naomichi Hatano
Using a time operator, we define a tunneling time for a particle going through a barrier. This tunneling time is the average of the phase time introduced by other authors. In addit…
Quantum teleportation scheme by selecting one of multiple output ports
Satoshi Ishizaka, Tohya Hiroshima
The scheme of quantum teleportation, where Bob has multiple (N) output ports and obtains the teleported state by simply selecting one of the N ports, is thoroughly studied. We cons…
Quantum communication using a bounded-size quantum reference frame
Stephen D. Bartlett, Terry Rudolph, Robert W. Spekkens +1
Typical quantum communication schemes are such that to achieve perfect decoding the receiver must share a reference frame with the sender. Indeed, if the receiver only possesses a…
Quantum error correction beyond qubits
Takao Aoki, Go Takahashi, Tadashi Kajiya +4
Quantum computation and communication rely on the ability to manipulate quantum states robustly and with high fidelity. Thus, some form of error correction is needed to protect fra…
Entanglement purification protocol for a mixture of a pure entangled state and a pure product state
Mikolaj Czechlewski, Andrzej Grudka, Satoshi Ishizaka +1
We present an entanglement purification protocol for a mixture of a pure entangled state and a pure product state, which are orthogonal to each other. The protocol is combination o…