Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Armour, Andrew D."'
Autor:
Lang, Ben, Armour, Andrew D.
We analyse the entanglement in a model Josephson photonics system in which a dc voltage-biased Josephson junction couples a collection of cavity modes and populates them with microwave photons. Using an approximate quadratic Hamiltonian model, we stu
Externí odkaz:
http://arxiv.org/abs/2410.00805
A Josephson junction laser is realised when a microwave cavity is driven by a voltage-biased Josephson junction. Through the ac Josephson effect, a dc voltage generates a periodic drive that acts on the cavity and generates interactions between its m
Externí odkaz:
http://arxiv.org/abs/2208.03191
Publikováno v:
Phys. Rev. B 104, 155424 (2021)
Inelastic Cooper pair tunneling across a voltage-biased Josephson junction in series with one or more microwave cavities can generate photons via resonant processes in which the energy lost by the Cooper pair matches that of the photon(s) produced. W
Externí odkaz:
http://arxiv.org/abs/2106.15243
Autor:
Lang, Ben, Armour, Andrew D.
Publikováno v:
New J. Phys. 23 033021 (2021)
We explore the dissipative dynamics of nonlinearly driven oscillator systems tuned to resonances where multiple excitations are generated. Such systems are readily realised in circuit QED systems combining Josephson junctions with a microwave cavity
Externí odkaz:
http://arxiv.org/abs/2012.10149
Publikováno v:
Phys. Rev. A 104, 033508 (2021)
We exploit local quantum estimation theory to investigate the measurement of linear and quadratic coupling strengths in a driven-dissipative optomechanical system. For experimentally realistic values of the model parameters, we find that the linear c
Externí odkaz:
http://arxiv.org/abs/2012.08876
Publikováno v:
Phys. Rev. Research 2, 013233 (2020)
We introduce a simple model system to study synchronization theoretically in quantum oscillators that are not just in limit-cycle states, but rather display a more complex bistable dynamics. Our oscillator model is purely dissipative, with a two-phot
Externí odkaz:
http://arxiv.org/abs/1906.07603
Publikováno v:
Phys. Scr. 94, 104001 (2019)
We explore the similarities and differences between simple theoretical models developed to describe the quantum optical micromaser and Josephson-photonics devices. Whilst the micromaser has long been recognised as an important model for the dynamics
Externí odkaz:
http://arxiv.org/abs/1903.04182
Publikováno v:
Phys. Rev. B 99, 045442 (2019)
We study the dynamical multistability of a solid-state single-atom laser implemented in a quantum-dot spin valve. The system is formed by a resonator that interacts with a two-level system in a dot in contact with two ferromagnetic leads of antiparal
Externí odkaz:
http://arxiv.org/abs/1808.04884
Publikováno v:
Phys. Rev. A 91, 061401 (2015)
We investigate quantum synchronization theoretically in a system consisting of two cold ions in microtraps. The ions' motion is damped by a standing-wave laser whilst also being driven by a blue-detuned laser which results in self-oscillation. Workin
Externí odkaz:
http://arxiv.org/abs/1412.1863
Autor:
Armour, Andrew D.
This thesis describes theoretical investigations into the dynamics of superfluid films and the effects of disorder on the roughening transition of crystal surfaces. The dynamic theory of superfluid helium films, due to Ambegaokar et al., is refined t
Externí odkaz:
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266937