Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Berry, D. W."'
Publikováno v:
Phys. Rev. B 83, 125410 (2011)
We propose a protocol to estimate magnetic fields using a single nitrogen-vacancy (N-V) center in diamond, where the estimate precision scales inversely with time, ~1/T$, rather than the square-root of time. The method is based on converting the task
Externí odkaz:
http://arxiv.org/abs/1103.4816
Autor:
Berry, D. W., Lvovsky, A. I.
Publikováno v:
Phys. Rev. Lett. 105, 203601 (2010)
We answer the question whether linear-optical processing of the states produced by one or multiple imperfect single-photon sources can improve the single-photon fidelity. This processing can include arbitrary interferometers, coherent states, feedfor
Externí odkaz:
http://arxiv.org/abs/1004.2245
Publikováno v:
Nature Photonics 5, 43 (2011)
The high-precision interferometric measurement of an unknown phase is the basis for metrology in many areas of science and technology. Quantum entanglement provides an increase in sensitivity, but present techniques have only surpassed the limits of
Externí odkaz:
http://arxiv.org/abs/1003.5213
Autor:
Wheatley, T. A., Berry, D. W., Yonezawa, H., Nakane, D., Arao, H., Pope, D. T., Ralph, T. C., Wiseman, H. M., Furusawa, A., Huntington, E. H.
Publikováno v:
Phys Rev Lett, 104, 093601, 2010
Quantum parameter estimation has many applications, from gravitational wave detection to quantum key distribution. We present the first experimental demonstration of the time-symmetric technique of quantum smoothing. We consider both adaptive and non
Externí odkaz:
http://arxiv.org/abs/0912.1162
Publikováno v:
Phys. Rev. A 80, 052114 (2009)
We present the theory of how to achieve phase measurements with the minimum possible variance in ways that are readily implementable with current experimental techniques. Measurements whose statistics have high-frequency fringes, such as those obtain
Externí odkaz:
http://arxiv.org/abs/0907.0014
Publikováno v:
New J. Phys. 12, 053011 (2010).
Recently a pair of experiments demonstrated a simulation of Abelian anyons in a spin network of single photons. The experiments were based on an Abelian discrete gauge theory spin lattice model of Kitaev. Here we describe how to use linear optics and
Externí odkaz:
http://arxiv.org/abs/0906.4578
Publikováno v:
IEEE J. Sel. Top. Quantum Electron., 15, 1661-1672 (2009)
Adaptive techniques make practical many quantum measurements that would otherwise be beyond current laboratory capabilities. For example: they allow discrimination of nonorthogonal states with a probability of error equal to the Helstrom bound; they
Externí odkaz:
http://arxiv.org/abs/0904.2045
Publikováno v:
New J. Phys. 11, 073023 (2009)
We derive, and experimentally demonstrate, an interferometric scheme for unambiguous phase estimation with precision scaling at the Heisenberg limit that does not require adaptive measurements. That is, with no prior knowledge of the phase, we can ob
Externí odkaz:
http://arxiv.org/abs/0809.3308
Publikováno v:
Nature.450:393-396,2007
Measurement underpins all quantitative science. A key example is the measurement of optical phase, used in length metrology and many other applications. Advances in precision measurement have consistently led to important scientific discoveries. At t
Externí odkaz:
http://arxiv.org/abs/0709.2996
Autor:
Berry, D. W., Wiseman, H. M.
Publikováno v:
Phys. Rev. A 65, 043803 (2002)
We analyze the problem of quantum-limited estimation of a stochastically varying phase of a continuous beam (rather than a pulse) of the electromagnetic field. We consider both non-adaptive and adaptive measurements, and both dyne detection (using a
Externí odkaz:
http://arxiv.org/abs/quant-ph/0111013