Luigi Amico
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View article: Diode effect in the Fraunhofer pattern of disordered planar Josephson junctions
Diode effect in the Fraunhofer pattern of disordered planar Josephson junctions Open
The Josephson diode effect describes the property of a Josephson junction to have different values of the critical current for different directions of applied bias current and it is the focus of intense research thanks to the potential tec…
View article: Synthetic fractional flux quanta in a ring of superconducting qubits
Synthetic fractional flux quanta in a ring of superconducting qubits Open
A ring of capacitively coupled transmons threaded by a synthetic magnetic field is studied as a realization of a strongly interacting bosonic system. The synthetic flux is imparted through a specific Floquet modulation scheme based on a su…
View article: Sensing electric fields through Rydberg atom networks
Sensing electric fields through Rydberg atom networks Open
We present the operating principle of a quantum sensor for electric fields based on networks of Rydberg atoms. The sensing mechanism exploits the dependence of the Rydberg blockade on the electric field, particularly in the vicinity of the…
View article: Josephson Dynamics in 2D Ring-shaped Condensates
Josephson Dynamics in 2D Ring-shaped Condensates Open
We investigate Josephson transport in a fully closed, two-dimensional superfluid circuit formed by a ring-shaped 87Rb Bose-Einstein condensate that contains two optical barriers acting as movable weak links. Translating these barriers at c…
View article: Dynamical Aharonov-Bohm cages and tight meson confinement in a $${{\mathbb{Z}}}_{2}$$-loop gauge theory
Dynamical Aharonov-Bohm cages and tight meson confinement in a $${{\mathbb{Z}}}_{2}$$-loop gauge theory Open
Low-dimensional lattice gauge theories based on simplified gauge groups have emerged as relevant models of charge-confinement that can potentially be realized with quantum simulators. The intertwined dynamics of matter and gauge fields can…
View article: Persistent currents in ultracold gases
Persistent currents in ultracold gases Open
International audience
View article: Suppressing chaos with mixed superconducting-qubit devices
Suppressing chaos with mixed superconducting-qubit devices Open
In quantum information processing, a tension between two different tasks occurs: while qubits' states can be preserved by isolating them, quantum gates can be realized only through qubit-qubit interactions. In arrays of qubits, weak coupli…
View article: Atomic Josephson Parametric Amplifier
Atomic Josephson Parametric Amplifier Open
We study the dynamics of a driven atomic Josephson junction that we propose as a parametric amplifier. By periodically modulating the position of the barrier, we induce a small current across the junction, serving as our input signal. The …
View article: Extractable energy from quantum superposition of current states
Extractable energy from quantum superposition of current states Open
We explore the energy content of superpositions of single-excitation current states. Specifically, we focus on the maximum energy that can be extracted from them through local unitary transformations. The figure of merit we employ is the l…
View article: Dynamical Aharonov-Bohm cages and tight meson confinement in a $\mathbb{Z}_2$-loop gauge theory
Dynamical Aharonov-Bohm cages and tight meson confinement in a $\mathbb{Z}_2$-loop gauge theory Open
We study the finite-density phases of a $\mathbb{Z}_2$ lattice gauge theory (LGT) of interconnected loops and dynamical $\mathbb{Z}_2$ charges. The gauge-invariant Wilson terms, accounting for the magnetic flux threading each loop, corresp…
View article: Diode effect in the Fraunhofer pattern of disordered planar Josephson junctions
Diode effect in the Fraunhofer pattern of disordered planar Josephson junctions Open
The Josephson diode effect describes the property of a Josephson junction to have different values of the critical current for different direction of applied bias current and it is the focus of intense research thanks to the possible appli…
View article: Static impurity in a mesoscopic system of SU($N$) fermionic matter-waves
Static impurity in a mesoscopic system of SU($N$) fermionic matter-waves Open
We investigate the effects of a static impurity, modeled by a localized barrier, in a one-dimensional mesoscopic system comprised of strongly correlated repulsive SU($N$)-symmetric fermions. For a mesoscopic sized ring under the effect of …
View article: Persistent currents in ultracold gases
Persistent currents in ultracold gases Open
Persistent currents flowing in spatially closed tracks define one of the most iconic concepts in mesoscopic physics. They have been studied in solid-state platforms such as superfluids, superconductors and metals. Cold atoms trapped in mag…
View article: Extractable energy from quantum superposition of current states
Extractable energy from quantum superposition of current states Open
We explore the energy content of superpositions of current states. Specifically, we focus on the maximum energy that can be extracted from them through local unitary transformations. The figure of merit we employ is the local ergotropy. We…
View article: Quantum superpositions of current states in Rydberg-atom networks
Quantum superpositions of current states in Rydberg-atom networks Open
Quantum simulation of many-body quantum systems using Rydberg-atom platforms has become of extreme interest in the last years. The possibility to realize spin Hamiltonians and the accurate control at the single atom level paved the way for…
View article: Synthetic fractional flux quanta in a ring of superconducting qubits
Synthetic fractional flux quanta in a ring of superconducting qubits Open
A ring of capacitively coupled transmons threaded by a synthetic magnetic field is studied as a realization of a strongly interacting bosonic system. The synthetic flux is imparted through a specific Floquet modulation scheme based on a su…
View article: Observation of Shapiro steps in an ultracold atomic Josephson junction
Observation of Shapiro steps in an ultracold atomic Josephson junction Open
The current-voltage characteristic of a driven superconducting Josephson junction displays discrete steps. This phenomenon, called the Shapiro steps, forms today's voltage standard! Here, we report the observation of Shapiro steps in a dri…
View article: Shapiro steps in strongly-interacting Fermi gases
Shapiro steps in strongly-interacting Fermi gases Open
We report the observation of Shapiro steps in a periodically driven Josephson junction between strongly-interacting Fermi superfluids of ultracold atoms. We observe quantized plateaus in the current-potential characteristics, the height an…
View article: Shapiro Steps in Driven Atomic Josephson Junctions
Shapiro Steps in Driven Atomic Josephson Junctions Open
We study driven atomic Josephson junctions realized by coupling two two-dimensional atomic clouds with a tunneling barrier. By moving the barrier at a constant velocity, dc and ac Josephson regimes are characterized by a zero and nonzero a…
View article: Floquet-Rydberg quantum simulator for confinement in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="double-struck">Z</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> gauge theories
Floquet-Rydberg quantum simulator for confinement in gauge theories Open
Recent advances in the field of quantum technologies have opened up the road for the realization of small-scale quantum simulators of lattice gauge theories which, among other goals, aim at improving our understanding on the nonperturbativ…
View article: Perspective on new implementations of atomtronic circuits
Perspective on new implementations of atomtronic circuits Open
In this article, we provide perspectives for atomtronics circuits on quantum technology platforms beyond simple bosonic or fermionic cold atom matter-wave currents. Specifically, we consider (i) matter-wave schemes with multi-component qua…
View article: Aharonov-Bohm effect for confined matter in lattice gauge theories
Aharonov-Bohm effect for confined matter in lattice gauge theories Open
Gauge theories arise in physical systems displaying space-time local symmetries. They provide a powerful description of important realms of physics ranging from fundamental interactions to statistical mechanics, condensed matter, and, more…
View article: Quantum superpositions of current states in Rydberg-atom networks
Quantum superpositions of current states in Rydberg-atom networks Open
Quantum simulation of many-body quantum systems using Rydberg-atom platforms has become of extreme interest in the last years. The possibility to realize spin Hamiltonians and the accurate control at the single atom level paved the way for…
View article: A Floquet-Rydberg quantum simulator for confinement in $\mathbb{Z}_2$ gauge theories
A Floquet-Rydberg quantum simulator for confinement in $\mathbb{Z}_2$ gauge theories Open
Recent advances in the field of quantum technologies have opened up the road for the realization of small-scale quantum simulators of lattice gauge theories which, among other goals, aim at improving our understanding on the non-perturbati…
View article: Perspective on new implementations of atomtronic circuits
Perspective on new implementations of atomtronic circuits Open
In this article, we provide perspectives for atomtronics circuits on quantum technology platforms beyond simple bosonic or fermionic cold atom matter-wave currents. Specifically, we consider (i) matter-wave schemes with multi-component qua…
View article: Massive particle interferometry with lattice solitons
Massive particle interferometry with lattice solitons Open
We discuss an interferometric scheme employing interference of bright solitons formed as specific bound states of attracting bosons on a lattice. We revisit the proposal of Castin and Weiss [Phys. Rev. Lett. vol. 102, 010403 (2009)] for us…
View article: Controlled dissipation for Rydberg atom experiments
Controlled dissipation for Rydberg atom experiments Open
We demonstrate a simple technique for adding controlled dissipation to Rydberg atom experiments. In our experiments we excite cold rubidium atoms in a magneto-optical trap to $70$-S Rydberg states, whilst simultaneously inducing forced dis…
View article: Interference dynamics of matter-waves of SU($N$) fermions
Interference dynamics of matter-waves of SU($N$) fermions Open
Interacting N-component fermions spatially confined in ring-shaped potentials display specific coherence properties. The orbital angular momentum per particle of such systems can be quantized to fractional values specifically depending on …
View article: Coherent excitation transport through ring-shaped networks
Coherent excitation transport through ring-shaped networks Open
The coherent quantum transport of matter wave through a ring-shaped circuit attached to leads defines an iconic system in mesoscopic physics that has allowed both to explore fundamental questions in quantum science and to draw important av…
View article: Rydberg atomtronic devices
Rydberg atomtronic devices Open
Networks of Rydberg atoms provide a powerful basis for quantum simulators and quantum technologies. Inspired by matter-wave atomtronics, here we engineer switches, diodes and universal logic gates. Our schemes control the Rydberg excitatio…