All Outputs (22)

Hybrid coherent control of magnons in a ferromagnetic phononic resonator excited by laser pulses (2024)
Journal Article

We propose and demonstrate the concept of hybrid coherent control (CC) whereby a quantum or classical harmonic oscillator is excited by two excitations: one is quasiharmonic (i.e., harmonic with a finite lifetime) and the other is a pulsed broadband... Read More about Hybrid coherent control of magnons in a ferromagnetic phononic resonator excited by laser pulses.

Discrete time translation symmetry breaking in a Josephson junction laser (2023)
Journal Article

A Josephson junction laser is realized 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... Read More about Discrete time translation symmetry breaking in a Josephson junction laser.

Defining the Semiclassical Limit of the Quantum Rabi Hamiltonian (2022)
Journal Article

The crossover from quantum to semiclassical behavior in the seminal Rabi model of light-matter interaction still, surprisingly, lacks a complete and rigorous understanding. A formalism for deriving the semiclassical model directly from the quantum Ha... Read More about Defining the Semiclassical Limit of the Quantum Rabi Hamiltonian.

A macroscopic object passively cooled into its quantum ground state of motion beyond single-mode cooling (2021)
Journal Article

The nature of the quantum-to-classical crossover remains one of the most challenging open question of Science to date. In this respect, moving objects play a specific role. Pioneering experiments over the last few years have begun exploring quantum b... Read More about A macroscopic object passively cooled into its quantum ground state of motion beyond single-mode cooling.

Josephson photonics with simultaneous resonances (2021)
Journal Article

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... Read More about Josephson photonics with simultaneous resonances.

Quantum estimation of coupling strengths in driven-dissipative optomechanics (2021)
Journal Article

We exploit local quantum estimation theory to investigate the measurement of linear (g1) and quadratic (g2) coupling strengths in a driven-dissipative optomechanical system in the red-sideband regime. We consider model parameters inspired by recent e... Read More about Quantum estimation of coupling strengths in driven-dissipative optomechanics.

Multi-Photon Resonances in Josephson Junction-Cavity Circuits (2021)
Journal Article

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... Read More about Multi-Photon Resonances in Josephson Junction-Cavity Circuits.

Beyond linear coupling in microwave optomechanics (2020)
Journal Article

We explore the nonlinear dynamics of a cavity optomechanical system. Our realization consisting of a drumhead nano-electro-mechanical resonator (NEMS) coupled to a microwave cavity, allows for a nearly ideal platform to study the nonlinearities arisi... Read More about Beyond linear coupling in microwave optomechanics.

Phase synchronization in coupled bistable oscillators (2020)
Journal Article

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... Read More about Phase synchronization in coupled bistable oscillators.

Electronic and photonic counting statistics as probes of non-equilibrium quantum dynamics (2020)
Journal Article

© 2020 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft. We analyse the full counting statistics (FCS) of photons flowing in and out of a microwave cavity coupled to a voltag... Read More about Electronic and photonic counting statistics as probes of non-equilibrium quantum dynamics.

Theory of double Cooper-pair tunneling and light emission mediated by a resonator (2019)
Journal Article

Photon emission by tunneling electrons can be encouraged by locating a resonator close to the tunnel junction and applying an appropriate voltage-bias. However, studies of normal metals show that the resonator also affects how the charges flow, facil... Read More about Theory of double Cooper-pair tunneling and light emission mediated by a resonator.

Josephson junction cavity systems as cousins of the quantum optical micromaser (2019)
Journal Article

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... Read More about Josephson junction cavity systems as cousins of the quantum optical micromaser.

Dynamical multistability in a quantum dot laser (2019)
Journal Article

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... Read More about Dynamical multistability in a quantum dot laser.

Dynamics of many-body quantum synchronisation (2018)
Journal Article

© 2018 The Author(s). The Author(s). Published by IOP Publishing on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft. We analyse the properties of the synchronisation transition in a many-body system consisting of quantum va... Read More about Dynamics of many-body quantum synchronisation.

Noise switching at a dynamical critical point in a cavity-conductor hybrid (2017)
Journal Article

Coupling a mesoscopic conductor to a microwave cavity can lead to fascinating feedback effects which generate strong correlations between the dynamics of photons and charges. We explore the connection between cavity dynamics and charge transport in... Read More about Noise switching at a dynamical critical point in a cavity-conductor hybrid.

Quantum dynamics of a Josephson junction driven cavity mode system in the presence of voltage bias noise (2017)
Journal Article

We give a semiclassical analysis of the average photon number as well as photon number variance (Fano factor F) for a Josephson junction (JJ) embedded microwave cavity system, where the JJ is subject to a fluctuating (i.e., noisy) bias voltage with f... Read More about Quantum dynamics of a Josephson junction driven cavity mode system in the presence of voltage bias noise.

Synchronization of micromasers (2016)
Journal Article

We investigate synchronization effects in quantum self-sustained oscillators theoretically using the micromaser as a model system. We use the probability distribution for the relative phase as a tool for quantifying the emergence of preferred phases... Read More about Synchronization of micromasers.

Spin correlations as a probe of quantum synchronization in trapped ion phonon-lasers (2015)
Journal Article

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... Read More about Spin correlations as a probe of quantum synchronization in trapped ion phonon-lasers.

Josephson photonics with a two-mode superconducting circuit (2015)
Journal Article

We analyze the quantum dynamics of two electromagnetic oscillators coupled in series to a voltage-biased Josephson junction. When the applied voltage leads to a Josephson frequency across the junction which matches the sum of the two mode frequencies... Read More about Josephson photonics with a two-mode superconducting circuit.

Realization of a single-Cooper-pair Josephson laser (2014)
Journal Article

We have embedded a voltage-biased Cooper-pair transistor (CPT) in a high-Q superconducting microwave cavity. When the energy given to a tunneling Cooper pair by the voltage bias is equal to a multiple of the cavity photon frequency, the cavity is pum... Read More about Realization of a single-Cooper-pair Josephson laser.