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10 papers · 2 filters
Logical Pre- and Post-Selection paradoxes, measurement-disturbance and contextuality
M. S. Leifer, R. W. Spekkens
Many seemingly paradoxical effects are known in the predictions for outcomes of measurements made on pre- and post-selected quantum systems. A class of such effects, which we call…
Pre- and Post-selection paradoxes and contextuality in quantum mechanics
M. S. Leifer, R. W. Spekkens
Many seemingly paradoxical effects are known in the predictions for outcomes of intermediate measurements made on pre- and post-selected quantum systems. Despite appearances, these…
Entanglement under restricted operations: Analogy to mixed-state entanglement
Stephen D. Bartlett, Andrew C. Doherty, Robert W. Spekkens +1
We show that the classification of bi-partite pure entangled states when local quantum operations are restricted yields a structure that is analogous in many respects to that of mi…
Entanglement Assisted Metrology
Paola Cappellaro, Joseph Emerson, Nicolas Boulant +3
We propose a new approach to the measurement of a single spin state, based on nuclear magnetic resonance (NMR) techniques and inspired by the coherent control over many-body system…
Discrete Wigner functions and quantum computational speedup
Ernesto F. Galvao
In [Phys. Rev. A 70, 062101 (2004)] Gibbons et al. defined a class of discrete Wigner functions W to represent quantum states in a finite Hilbert space dimension d. I characterize…
Decoherence-full subsystems and the cryptographic power of a private shared reference frame
Stephen D. Bartlett, Terry Rudolph, Robert W. Spekkens
We show that private shared reference frames can be used to perform private quantum and private classical communication over a public quantum channel. Such frames constitute a nove…