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5 papers · 2 filters
Strategies and Networks for State-Dependent Quantum Cloning
Anthony Chefles, Stephen M. Barnett
State-dependent cloning machines that have so far been considered either deterministically copy a set of states approximately, or probablistically copy them exactly. In considering…
Quantum local-field corrections and spontaneous decay
S. Scheel, L. Knoll, D. -G. Welsch +1
A recently developed scheme [S. Scheel, L. Knoll, and D.-G. Welsch, Phys. Rev. A 58, 700 (1998)] for quantizing the macroscopic electromagnetic field in linear dispersive and absor…
Quantum State Separation, Unambiguous Discrimination and Exact Cloning
Anthony Chefles, Stephen M. Barnett
Unambiguous discrimination and exact cloning reduce the square-overlap between quantum states, exemplifying the more general type of procedure we term state separation. We obtain t…
Optimum Unambiguous Discrimination Between Linearly Independent Symmetric States
Anthony Chefles, Stephen M. Barnett
The quantum formalism permits one to discriminate sometimes between any set of linearly-independent pure states with certainty. We obtain the maximum probability with which a set o…
Unambiguous Discrimination Between Linearly-Independent Quantum States
Anthony Chefles
The theory of generalised measurements is used to examine the problem of discriminating unambiguously between non-orthogonal pure quantum states. Measurements of this type never gi…