136 citations · 536 across the 18 of their papers we have counts for
19 papers
Interaction of quantum systems with single pulses of quantized radiation
Victor Rueskov Christiansen, Alexander Holm Kiilerich, Klaus Mølmer
The interaction of a propagating pulse of quantum radiation with a localized quantum system can be described by a cascaded master equation with a distinct initially populated input…
Ancilla mediated qubit readout and heralded entanglement between rare-earth dopant ions in crystals
Kamanasish Debnath, Alexander Holm Kiilerich, Klaus Mølmer
Owing to their long excited state lifetimes, rare-earth ions in crystals are widely used in quantum applications. To allow optical readout of the qubit state of individual ions, we…
Quantum interactions with pulses of radiation
Alexander Holm Kiilerich, Klaus Mølmer
This article presents a general master equation formalism for the interaction between travelling pulses of quantum radiation and localized quantum systems. Traveling fields populat…
Integration of the Berry curvature on a qubit state manifold by coupling to a quantum meter system
Peng Xu, Shi-Liang Zhu, Klaus Mølmer +1
We present a scheme that allows integration of the Berry curvature and thus determination of the Chern number of a qubit eigenstate manifold. Our proposal continuously couples the…
Coherent spectral hole burning and qubit isolation by stimulated Raman adiabatic passage
Kamanasish Debnath, Alexander Holm Kiilerich, Albert Benseny +1
We describe how stimulated Raman adiabatic passage (STIRAP) can be applied to create spectral holes in an inhomogeneously broadened system. Due to the robustness of STIRAP, our pro…
Input-Output Theory with Quantum Pulses
Alexander Holm Kiilerich, Klaus Mølmer
We present a formalism that accounts for the evolution of quantum states of travelling light pulses incident on and emanating from a local quantum scatterer such as an atom or a ca…
A dynamical approach to ancilla assisted quantum thermometry
Alexander Holm Kiilerich, Antonella De Pasquale, Vittorio Giovannetti
A scheme for improving the sensitivity of quantum thermometry is proposed where the sensing quantum system used to recover the temperature of an external bath is dynamically couple…
Quantum Control with Measurements and Quantum Zeno Dynamics
Jens Jakob Sørensen, Mogens Dalgaard, Alexander Holm Kiilerich +2
We introduce an efficient iterative method to prepare a target state in Hilbert spaces with high dimensionality using a combination of unitary evolution, measurements, and quantum…
Hypothesis testing with a continuously monitored quantum system
Alexander Holm Kiilerich, Klaus Mølmer
In a Bayesian analysis, the likelihood that specific candidate parameters govern the evolution of a quantum system are conditioned on the outcome of measurements which, in turn, ca…
Multi-state and multi-hypothesis discrimination with open quantum systems
Alexander Holm Kiilerich, Klaus Mølmer
We show how an upper bound for the ability to discriminate any number N of candidates for the Hamiltonian governing the evolution of an open quantum system may be calculated by num…
Relaxation of an ensemble of two-level emitters in a squeezed bath
Alexander Holm Kiilerich, Klaus Mølmer
We derive and evaluate equations of motion for the mean values and variances of the components of spins collectively coupled to a broadband squeezed radiation reservoir. Our formal…
Homodyne monitoring of post-selected decay
D. Tan, N. Foroozani, M. Naghiloo +3
We use homodyne detection to monitor the radiative decay of a superconducting qubit. According to the classical theory of conditional probabilities, the excited state population di…
Measurement of the topological Chern number by continuous probing of a qubit subject to a slowly varying Hamiltonian
Peng Xu, Alexander Holm Kiilerich, Ralf Blattmann +3
We analyze a measurement scheme that allows determination of the Berry curvature and the topological Chern number of a Hamiltonian with parameters exploring a two-dimensional close…
Random search for a dark resonance
Alexander Holm Kiilerich, Klaus Mølmer
A pair of resonant laser fields can drive a three-level system into a dark state where it seizes to absorb and emit radiation due to destructive interference. We propose a scheme t…
Magnetic resonance with squeezed microwaves
A. Bienfait, P. Campagne-Ibarcq, A. Holm-Kiilerich +9
Vacuum fluctuations of the electromagnetic field set a fundamental limit to the sensitivity of a variety of measurements, including magnetic resonance spectroscopy. We report the u…
Bayesian parameter estimation by continuous homodyne detection
Alexander Holm Kiilerich, Klaus Mølmer
We simulate the process of continuous homodyne detection of the radiative emission from a quantum system, and we investigate how a Bayesian analysis can be employed to determine un…
Quantum Zeno effect in parameter estimation
Alexander Holm Kiilerich, Klaus Mølmer
The quantum Zeno effect freezes the evolution of a quantum system subject to frequent measure- ments. We apply a Fisher information analysis to show that because of this effect, a…
Parameter estimation by multi-channel photon counting
Alexander Holm Kiilerich, Klaus Mølmer
The physical parameters governing the dynamics of a light emitting quantum system can be estimated from the photon counting signal. The information available in the full detection…
Estimation of atomic interaction parameters by photon counting
Alexander Holm Kiilerich, Klaus Mølmer
Detection of radiation signals is at the heart of precision metrology and sensing. In this article we show how the fluctuations in photon counting signals can be exploited to optim…