scholarly journals Stark many-body localization transitions in superconducting circuits

2021 ◽  
Vol 104 (20) ◽  
Author(s):  
Yong-Yi Wang ◽  
Zheng-Hang Sun ◽  
Heng Fan
Keyword(s):  
Many Body ◽  
Superconducting Circuits

scholarly journals Probing the many-body localization phase transition with superconducting circuits

2019 ◽  
Vol 100 (13) ◽  
Author(s):  
Tuure Orell ◽  
Alexios A. Michailidis ◽  
Maksym Serbyn ◽  
Matti Silveri
Keyword(s):  
Phase Transition ◽  
Many Body ◽  
Superconducting Circuits ◽  
The Many

scholarly journals Observation of quantum many-body effects due to zero point fluctuations in superconducting circuits

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Sébastien Léger ◽  
Javier Puertas-Martínez ◽  
Karthik Bharadwaj ◽  
Rémy Dassonneville ◽  
Jovian Delaforce ◽  
...  
Keyword(s):  
Casimir Effect ◽  
Structure Constant ◽  
Zero Point ◽  
Fine Structure Constant ◽  
Many Body ◽  
Bloch Oscillations ◽  
Superconducting Circuits ◽  
High Impedance ◽  
Non Linear ◽  
Large Phase

AbstractElectromagnetic fields possess zero point fluctuations which lead to observable effects such as the Lamb shift and the Casimir effect. In the traditional quantum optics domain, these corrections remain perturbative due to the smallness of the fine structure constant. To provide a direct observation of non-perturbative effects driven by zero point fluctuations in an open quantum system we wire a highly non-linear Josephson junction to a high impedance transmission line, allowing large phase fluctuations across the junction. Consequently, the resonance of the former acquires a relative frequency shift that is orders of magnitude larger than for natural atoms. Detailed modeling confirms that this renormalization is non-linear and quantum. Remarkably, the junction transfers its non-linearity to about thirty environmental modes, a striking back-action effect that transcends the standard Caldeira-Leggett paradigm. This work opens many exciting prospects for longstanding quests such as the tailoring of many-body Hamiltonians in the strongly non-linear regime, the observation of Bloch oscillations, or the development of high-impedance qubits.

Practical one-step synthesis of multipartite entangled states on superconducting circuits

2019 ◽  
Vol 17 (07) ◽  
pp. 1950051
Author(s):  
Rui Tao ◽  
Xiao-Tao Mo ◽  
Zheng-Yuan Xue ◽  
Jian Zhou
Keyword(s):  
Quantum Information Processing ◽  
Single Step ◽  
Entangled States ◽  
Entangled State ◽  
Many Body ◽  
Entanglement Generation ◽  
Superconducting Circuits ◽  
Transmission Line Resonator ◽  
One Step ◽  
Microwave Control

Quantum entanglement is an important resource for quantum information processing tasks. However, realistic multipartite entangled state production is very difficult. In this paper, we propose an efficient single-step scheme for generating many body Greenberger–Horne–Zeilinger (GHZ) states on superconducting circuits by using a superconducting transmission-line resonator (TLR) interact with [Formula: see text] superconducting transmon qubits. The distinct merit of our proposal is that it does not require the qubit-resonator coupling strengths to be the same, which is usually impractical experimentally, and thus is one of the main reasons for entanglement generation infidelity in previous single-step schemes. The removing of the uniform interaction requirement is achieved by modulating the qubits splitting frequencies with ac microwave fields, which results in tunable individual qubit-resonator coupling strength, and thus effective uniform qubit–qubit interaction Hamiltonian can be obtained. Since microwave control is conventional nowadays, our proposal can be directly tested experimentally, which makes previous multipartite entangled states generation schemes more efficient.

scholarly journals Breaking of Huygens-Fresnel principle in inhomogeneous Tomonaga-Luttinger liquids

2021 ◽  
Author(s):  
Marek Gluza ◽  
Per Moosavi ◽  
Spyros Sotiriadis
Keyword(s):  
Light Cone ◽  
Ultracold Atoms ◽  
Spin Chains ◽  
Many Body ◽  
Luttinger Liquids ◽  
Main Motivation ◽  
One Dimensional ◽  
Superconducting Circuits ◽  
Many Body Systems ◽  
Two Parameters

Abstract Tomonaga-Luttinger liquids (TLLs) can be used to effectively describe one-dimensional quantum many-body systems such as ultracold atoms, charges in nanowires, superconducting circuits, and gapless spin chains. Their properties are given by two parameters, the propagation velocity and the Luttinger parameter. Here we study inhomogeneous TLLs where these are promoted to functions of position and demonstrate that they profoundly affect the dynamics: In general, besides curving the light cone, we show that propagation is no longer ballistically localized to the light-cone trajectories, different from standard homogeneous TLLs. Specifically, if the Luttinger parameter depends on position, the dynamics features pronounced spreading into the light cone, which cannot be understood via a simple superposition of waves as in the Huygens-Fresnel principle. This is the case for ultracold atoms in a parabolic trap, which serves as our main motivation, and we discuss possible experimental observations in such systems.

Novel simulation model for many-body multipole dispersion interactions

1998 ◽  
Vol 94 (3) ◽  
pp. 417-433 ◽  
Author(s):  
MARTIN VAN DER HOEF ◽  
PAUL MADDEN
Keyword(s):  
Simulation Model ◽  
Dispersion Interactions ◽  
Many Body

On the many-body theory of nuclear reactions

1968 ◽  
Vol 111 (1) ◽  
pp. 392-416 ◽  
Author(s):  
K DIETRICH ◽  
K HARA
Keyword(s):  
Nuclear Reactions ◽  
Many Body ◽  
Many Body Theory ◽  
The Many ◽  
Body Theory

MANY-BODY THEORY FOR HYPERFINE EFFECTS IN ATOMS AND MOLECULES

1970 ◽  
Vol 31 (C4) ◽  
pp. C4-99-C4-104
Author(s):  
T. P. DAS ◽  
C. M. DUTTA ◽  
N. C. DUTTA
Keyword(s):  
Many Body ◽  
Atoms And Molecules ◽  
Many Body Theory ◽  
Body Theory
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