Zobrazeno 1 - 10
of 714
pro vyhledávání: '"Carmichael H"'
Publikováno v:
R Guti\'errez-J\'auregui and H J Carmichael 2018 Phys. Scr. 93 104001
A system evolving under the driven Jaynes--Cummings model will undergo a phase transition at a critical driving field amplitude. This transition is foreshadowed by a collapse of the quasienergy level spectra of the system and remains present as the m
Externí odkaz:
http://arxiv.org/abs/1808.06727
Publikováno v:
Phys. Rev. A 98, 023804 (2018)
The mean-field steady states of a generalized model of $N$ two-state systems interacting with one mode of the radiation field in the presence of external driving and dissipation are surveyed as a function of three control parameters: one governs the
Externí odkaz:
http://arxiv.org/abs/1806.05761
Autor:
Minev, Z. K., Mundhada, S. O., Shankar, S., Reinhold, P., Gutierrez-Jauregui, R., Schoelkopf, R. J., Mirrahimi, M., Carmichael, H. J., Devoret, M. H.
Publikováno v:
Nature 570, 200 (2019); see also arXiv:1902.10355 [quant-ph]
Quantum physics was invented to account for two fundamental features of measurement results -- their discreetness and randomness. Emblematic of these features is Bohr's idea of quantum jumps between two discrete energy levels of an atom. Experimental
Externí odkaz:
http://arxiv.org/abs/1803.00545
We present an elementary derivation and generalisation of a recently reported method of simulating feedback in open quantum systems. We use our generalised method to simulate systems with multiple delays, as well as cascaded systems with delayed back
Externí odkaz:
http://arxiv.org/abs/1702.05776
Autor:
Whalen, S. J., Carmichael, H. J.
Publikováno v:
Phys. Rev. A 93, 063820 (2016)
The time-local master equation for a driven boson system interacting with a boson environment is derived by way of a time-local Heisenberg--Langevin equation. Extension to the driven qubit fails---except for weak excitation---due to the lost linearit
Externí odkaz:
http://arxiv.org/abs/1602.03971
Publikováno v:
Phys. Rev. A 91, 023829 (2015)
We investigate a two-way cascaded cavity QED system consisting of microtoroidal resonators coupled through an optical fiber. Each microtoroidal cavity supports two counter-propagating whispering-gallery modes coupled to single atoms through their eva
Externí odkaz:
http://arxiv.org/abs/1501.02515
Autor:
Cimmarusti, A. D., Patterson, B. D., Schroeder, C. A., Orozco, L. A., Barberis-Blostein, P., Carmichael, H. J.
Publikováno v:
EPJ Web of Conferences 57, 03005 (2013)
Conditional measurements on the undriven mode of a two-mode cavity QED system prepare a coherent superposition of ground states which generate quantum beats. The continuous system drive induces decoherence through the phase interruptions from Rayleig
Externí odkaz:
http://arxiv.org/abs/1309.4792
Autor:
Cimmarusti, A. D., Schroeder, C. A., Patterson, B. D., Orozco, L. A., Barberis-Blostein, P., Carmichael, H. J.
Publikováno v:
Control of conditional quantum beats in cavity QED: amplitude decoherence and phase shifts A D Cimmarusti et al 2013 New J. Phys. 15 013017
We implement a simple feedback mechanism on a two-mode cavity QED system to preserve the Zeeman coherence of a ground state superposition that generates quantum beats on the second-order correlation function. Our investigation includes theoretical an
Externí odkaz:
http://arxiv.org/abs/1301.3000
Publikováno v:
D. G. Norris, A. D. Cimmarusti, L. A. Orozco, P. Barberis-Blostein, and H. J. Carmichael, Phys. Rev. A 86, 053816 (2012)
The spontaneous creation and persistence of ground-state coherence in an ensemble of intracavity Rb atoms has been observed as a quantum beat. Our system realizes a quantum eraser, where the detection of a first photon prepares a superposition of gro
Externí odkaz:
http://arxiv.org/abs/1211.6364
Autor:
Hughes, S., Carmichael, H. J.
Publikováno v:
2013 New J. Phys. 15 053039
We investigate pump-induced exciton inversion in a quantum-dot cavity system with continuous wave drive. Using a polaron-based master equation, we demonstrate excited-state populations above 0.9 for an InAs dot at a phonon bath temperature of 4K. In
Externí odkaz:
http://arxiv.org/abs/1210.0488