Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Spekkens, R. W."'
Autor:
Leifer, M. S., Spekkens, R. W.
Publikováno v:
J. Phys. A: Math. Theor. 47(27) 275301 (2014)
In approaches to quantum theory in which the quantum state is regarded as a representation of knowledge, information, or belief, two agents can assign different states to the same quantum system. This raises two questions: when are such state assignm
Externí odkaz:
http://arxiv.org/abs/1110.1085
Autor:
Leifer, M. S., Spekkens, R. W.
Publikováno v:
Phys. Rev. A 88, 052130 (2013)
Quantum theory can be viewed as a generalization of classical probability theory, but the analogy as it has been developed so far is not complete. Whereas the manner in which inferences are made in classical probability theory is independent of the c
Externí odkaz:
http://arxiv.org/abs/1107.5849
Autor:
Leifer, M. S., Spekkens, R. W.
Publikováno v:
Phys. Rev. Lett. 95, 200405 (2005)
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 effects do not demonstrate the impossibility of a noncontextual hidde
Externí odkaz:
http://arxiv.org/abs/quant-ph/0412178
Autor:
Leifer, M. S., Spekkens, R. W.
Publikováno v:
Proceedings of QS 2004, Int. J. Theor. Phys. 44:1977-1987 (2005)
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 ``logical pre- and post-selection paradoxes'', bear a striking resembl
Externí odkaz:
http://arxiv.org/abs/quant-ph/0412179
Autor:
Spekkens, R. W.
Publikováno v:
Phys. Rev. A 71, 052108 (2005)
An operational definition of contextuality is introduced which generalizes the standard notion in three ways: (1) it applies to arbitrary operational theories rather than just quantum theory, (2) it applies to arbitrary experimental procedures, rathe
Externí odkaz:
http://arxiv.org/abs/quant-ph/0406166
Publikováno v:
Phys. Rev. Lett. 92, 17901 (2004)
We present two polarization-based protocols for quantum key distribution. The protocols encode key bits in noiseless subspaces or subsystems, and so can function over a quantum channel subjected to an arbitrary degree of collective noise, as occurs,
Externí odkaz:
http://arxiv.org/abs/quant-ph/0306199
Publikováno v:
Phys. Rev. Lett. 91, 027901 (2003)
We show that communication without a shared reference frame is possible using entangled states. Both classical and quantum information can be communicated with perfect fidelity without a shared reference frame at a rate that asymptotically approaches
Externí odkaz:
http://arxiv.org/abs/quant-ph/0302111
Autor:
Spekkens, R. W., Rudolph, Terry
Publikováno v:
Phys. Rev. Lett. vol 89, 227901 (2002)
We present a quantum protocol for the task of weak coin flipping. We find that, for one choice of parameters in the protocol, the maximum probability of a dishonest party winning the coin flip if the other party is honest is 1/sqrt(2). We also show t
Externí odkaz:
http://arxiv.org/abs/quant-ph/0202118
Autor:
Spekkens, R. W., Rudolph, T.
Publikováno v:
Quantum Inform. Compu. 2, 66 (2002)
It is well known that no quantum bit commitment protocol is unconditionally secure. Nonetheless, there can be non-trivial upper bounds on both Bob's probability of correctly estimating Alice's commitment and Alice's probability of successfully unveil
Externí odkaz:
http://arxiv.org/abs/quant-ph/0107042
Autor:
Spekkens, R. W., Rudolph, T.
Publikováno v:
Phys. Rev. A 65, 012310 (2001)
Although it is impossible for a bit commitment protocol to be both arbitrarily concealing and arbitrarily binding, it is possible for it to be both partially concealing and partially binding. This means that Bob cannot, prior to the beginning of the
Externí odkaz:
http://arxiv.org/abs/quant-ph/0106019