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Soliton versus single photon quantum dynamics in arrays of superconducting qubits
Ben Blain, Giampiero Marchegiani, Juan Polo +2
Superconducting circuits constitute a promising platform for future implementation of quantum processors and simulators. Arrays of capacitively coupled transmon qubits naturally im…
Variational Quantum Eigensolver for SU() Fermions
Mirko Consiglio, Wayne J. Chetcuti, Carlos Bravo-Prieto +5
Variational quantum algorithms aim at harnessing the power of noisy intermediate-scale quantum computers, by using a classical optimizer to train a parameterized quantum circuit to…
GHZ-like states in the Qubit-Qudit Rabi Model
Yuan Shen, Giampiero Marchegiani, Gianluigi Catelani +4
We study a Rabi type Hamiltonian system in which a qubit and a d-level quantum system (qudit) are coupled through a common resonator. In the weak and strong coupling limits the spe…
Machine learning engineering of quantum currents
Tobias Haug, Rainer Dumke, Leong-Chuan Kwek +2
The design, accurate preparation and manipulation of quantum states in quantum circuits are essential operational tasks at the heart of quantum technologies. Nowadays, circuits can…
Topological pumping of quantum correlations
T. Haug, L. Amico, L. -C. Kwek +2
Topological pumping and duality transformations are paradigmatic concepts in condensed matter and statistical mechanics. In this paper, we extend the concept of topological pumping…
Topological pumping in Aharonov-Bohm rings
Tobias Haug, Rainer Dumke, Leong-Chuan Kwek +1
Topological Thouless pumping and Aharonov-Bohm effect are both fundamental effects enabled by the topological properties of the system. Here, we study both effects together: topolo…
Charge-Qubit-Resonator-Interface-Based Nonlinear Circuit QED
Deshui Yu, Leong Chuan Kwek, Luigi Amico +1
We explore applications of nonlinear circuit QED with a charge qubit inductively coupled to a microwave LC resonator in the photonic engineering and ultrastrong-coupling multiphoto…
Atomtronics-enabled Quantum Technologies
Luigi Amico, Gerhard Birkl, Malcolm Boshier +1
Atomtronics is an emerging field in quantum technology that promises to realize 'atomic circuit' architectures exploiting ultra-cold atoms manipulated in versatile micro-optical ci…
An Atomtronic Flux Qubit: A ring lattice of Bose-Einstein condensates interrupted by three weak links
D. Aghamalyan, N. T. Nguyen, F. Auksztol +6
We study a physical system consisting of a Bose-Einstein condensate confined to a ring shaped lattice potential interrupted by three weak links. The system is assumed to be driven…
Entanglement convertibility by sweeping through the quantum phases of the alternating bonds chain
Yu-Chin Tzeng, Li Dai, M. -C. Chung +2
We study the entanglement structure and the topological edge states of the ground state of the spin-1/2 XXZ model with bond alternation. We employ parity-density matrix renormaliza…
Exact analysis of the spectral properties of the anisotropic two-bosons Rabi model
Shuai Cui, Jun-Peng Cao, Heng Fan +1
We introduce the anisotropic two-photon Rabi model in which the rotating and counter rotating terms enters along with two different coupling constants. Eigenvalues and eigenvectors…
Local reversibility and entanglement structure of many-body ground states
Tomotaka Kuwahara, Itai Arad, Luigi Amico +1
The low-temperature physics of quantum many-body systems is largely governed by the structure of their ground states. Minimizing the energy of local interactions, ground states oft…
Anisotropic Rabi model
Qiong-Tao Xie, Shuai Cui, Jun-Peng Cao +2
We define the anisotropic Rabi model as the generalization of the spin-boson Rabi model: The Hamiltonian system breaks the parity symmetry; the rotating and counter-rotating intera…
Local convertibility of the ground state of the perturbed Toric code
Siddhartha Santra, Alioscia Hamma, Lukasz Cincio +3
We present analytical and numerical studies of the behaviour of the -Renyi entropies in the Toric code in presence of several types of perturbations aimed at studying the simula…
Effective dynamics of cold atoms flowing in two ring shaped optical potentials with tunable tunneling
Davit Aghamalyan, Luigi Amico, L. C Kwek
We study the current dynamics of coupled atomic condensates flowing in two ring-shaped optical potentials. We provide a specific setup where the ring-ring coupling can be tuned in…
Superfluid qubit systems with ring shaped optical lattices
Luigi Amico, Davit Aghamalyan, H. Crepaz +3
We study an experimentally feasible qubit system employing neutral atomic currents. Our system is based on bosonic cold atoms trapped in ring-shaped optical lattice potentials. The…
Local characterization of 1d topologically ordered states
Jian Cui, Luigi Amico, Heng Fan +3
We consider 1d Hamiltonian systems whose ground states display symmetry protected topological order. We show that ground states within the topological phase cannot be connected wit…
Classical Vs Quantum correlations in composite systems
Luigi Amico, Sougato Bose, Vladimir E. Korepin +1
Here we provide the contributions' abstracts published in a volume we edited as a special issue in International Journal of Modern Physics B. The volume deals with the recent progr…
Local response of topological order to an external perturbation
Alioscia Hamma, Lukasz Cincio, Siddhartha Santra +2
We study the behavior of the Rényi entropies for the toric code subject to a variety of different perturbations, by means of 2D density matrix renormalization group and analytical…
Quantum discord in the ground state of spin chains
Marcelo S. Sarandy, Thiago R. de Oliveira, Luigi Amico
The ground state of a quantum spin chain is a natural playground for investigating correlations. Nevertheless, not all correlations are genuinely of quantum nature. Here we review…
Topological order in 1D Cluster state protected by symmetry
Wonmin Son, Luigi Amico, Vlatko Vedral
We demonstrate how to construct the Z2*Z2 global symmetry which protects the ground state degeneracy of cluster states for open boundary conditions. Such a degeneracy ultimately ar…
Statistical mechanics of the Cluster-Ising model
Pietro Smacchia, Luigi Amico, Paolo Facchi +4
We study a Hamiltonian system describing a three-spin-1/2 cluster-like interaction competing with an Ising-like anti-ferromagnetic interaction. We compute free energy, spin correla…
Quantum phase transition between cluster and antiferromagnetic states
Wonmin Son, Luigi Amico, Rosario Fazio +3
We study a Hamiltonian system describing a three spin-1/2 cluster-like interaction competing with an Ising-like exchange. We show that the ground state in the cluster phase possess…
Ground state factorization and correlations with broken symmetry
Bruno Tomasello, Davide Rossini, Alioscia Hamma +1
We show how the phenomenon of factorization in a quantum many body system is of collective nature. To this aim we study the quantum discord in the one dimensional XY model in a…