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Quantum coherence: myth or fact?
Kae Nemoto, Samuel L. Braunstein
It has recently been argued that the inability to measure the absolute phase of an electromagnetic field prohibits the representation of a laser's output as a quantum optical coher…
Quantum Metrology: Detection of weak forces using Schrodinger Cat resources
Kae Nemoto, W. J. Munro, G. J. Milburn +1
We investigate the utility of non classical states of simple harmonic oscillators (a superposition of coherent states) for sensitive force detection. We find that like squeezed sta…
Quantum algorithms in group theory
Michael Batty, Samuel L. Braunstein, Andrew J. Duncan +1
We present a survey of quantum algorithms, primarily for an intended audience of pure mathematicians. We place an emphasis on algorithms involving group theory.
Towards photostatistics from photon-number discriminating detectors
Hwang Lee, Ulvi H. Yurtsever, Pieter Kok +4
We study the properties of a photodetector that has a number-resolving capability. In the absence of dark counts, due to its finite quantum efficiency, photodetection with such a d…
Quantum coherence in the presence of unobservable quantities
Kae Nemoto, Samuel L. Braunstein
State representations summarize our knowledge about a system. When unobservable quantities are introduced the state representation is typically no longer unique. However, this non-…
Quantum deleting and Signalling
Arun K. Pati, Samuel L. Braunstein
It is known that if we can clone an arbitrary state we can send signal faster than light. Here, we show that deletion of unknown quantum state against a copy can lead to superlumin…