All

It is widely spread in the literature that non-Markovianity (NM) may be
regarded as a resource in quantum mechanics. However, it is still unclear how
and when this alleged resource may be exploited. Here, we study the
relationship between NM and quantum optimal control under the objective of
generating entanglement within M non-interacting subsystems, each one coupled
to the same non-Markovian environment. Thus, we design a variety of entangling
protocols that are only achievable due to the existence of the environment. We

Local excitations in fractional quantum Hall systems are amongst the most
intriguing objects in condensed matter, as they behave like particles of
fractional charge and fractional statistics. In order to experimentally reveal
these exotic properties and further to use such excitations for quantum
computations, microscopic control over the excitations is necessary. Here we
discuss different optical strategies to achieve such control. First, we propose
that the application of a light field with non-zero orbital angular momentum

The nuclear spin bath (NSB) dynamics and its quantum control are of
importance for the storage and processing of quantum information within a
semiconductor environment. In the presence of a carrier spin, primarily it is
the hyperfine interaction that rules the high frequency NSB characteristics.
Here, we first study the overall coherence decay and rephasings in a
hyperfine-driven NSB through the temporal and spectral behaviors of the
so-called Loschmidt echo (LE). Its dependence on the NSB size, initial

Quantum communication relies on the efficient generation of entanglement
between remote quantum nodes, due to entanglement's key role in achieving and
verifying secure communications. Remote entanglement has been realized using a
number of different probabilistic schemes, but deterministic remote
entanglement has only recently been demonstrated, using a variety of
superconducting circuit approaches. However, the deterministic violation of a
Bell inequality, a strong measure of quantum correlation, has not to date been

We provide a fine-grained definition for monogamous measure of entanglement
that does not invoke any particular monogamy relation. Our definition is given
in terms an equality, as oppose to inequality, that we call the "disentangling
condition". We relate our definition to the more traditional one, by showing
that it generates standard monogamy relations. We then show that all quantum
Markov states satisfy the disentangling condition for any entanglement
monotone. In addition, we demonstrate that entanglement monotones that are

We consider the energy transfer process between two identical atoms placed
inside a perfectly conducting cylindrical waveguide. We first introduce a
general analytical expression of the energy transfer amplitude in terms of the
electromagnetic Green's tensor; we then evaluate it in the case of a
cylindrical waveguide made of a perfect conductor, for which analytical forms
of the Green's tensor exist. We numerically analyse the energy transfer
amplitude when the radius of the waveguide is such that the transition

We theoretically propose a method for on-demand generation of traveling
Schr\"odinger cat states, namely, quantum superpositions of distinct coherent
states of traveling fields. This method is based on deterministic generation of
intracavity cat states using a Kerr-nonlinear parametric oscillator (KPO) via
quantum adiabatic evolution. We show that the cat states generated inside a KPO
can be released into an output mode by controlling the parametric pump

We experimentally investigate the unitarity-limited behavior of the
three-body loss near a p-wave Feshbach resonance in a single-component Fermi
gas of $^6$Li atoms. At the unitarity limit, the three-body loss coefficient
$L_{3}$ exhibits universality in the sense that it is independent of the
interaction strength and follows the predicted temperature scaling law of $L_3
\propto T^{-2}$. When decreasing the interaction strength from the unitarity
regime, the three-body loss coefficient as a function of the interaction

Optomechanical sensors involving multiple optical carriers can experience
mechanically mediated interactions causing multi-mode correlations across the
optical fields. One instance is laser-interferometric gravitational wave
detectors which introduce multiple carrier frequencies for classical sensing
and control purposes. An outstanding question is whether such multi-carrier
optomechanical sensors outperform their single-carrier counterpart in terms of
quantum-limited sensitivity. We show that the best precision is achieved by a

Quantum Renyi relative entropies provide a one-parameter family of distances
between density matrices, which generalizes the relative entropy and the
fidelity. We study these measures for renormalization group flows in quantum
field theory. We derive explicit expressions in free field theory based on the
real time approach. Using monotonicity properties, we obtain new inequalities
that need to be satisfied by consistent renormalization group trajectories in
field theory. These inequalities play the role of a second law of