scholarly journals Light-mediated strong coupling between a mechanical oscillator and atomic spins 1 meter apart

Science ◽  
2020 ◽  
Vol 369 (6500) ◽  
pp. 174-179 ◽  
Author(s):  
Thomas M. Karg ◽  
Baptiste Gouraud ◽  
Chun Tat Ngai ◽  
Gian-Luca Schmid ◽  
Klemens Hammerer ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Quantum Physics ◽  
Quantum Control ◽  
Strong Interactions ◽  
Long Distance ◽  
Atomic Spin ◽  
Atomic Spins ◽  
Feedback Networks ◽  
Noise Squeezing ◽  
Opening Up

Engineering strong interactions between quantum systems is essential for many phenomena of quantum physics and technology. Typically, strong coupling relies on short-range forces or on placing the systems in high-quality electromagnetic resonators, which restricts the range of the coupling to small distances. We used a free-space laser beam to strongly couple a collective atomic spin and a micromechanical membrane over a distance of 1 meter in a room-temperature environment. The coupling is highly tunable and allows the observation of normal-mode splitting, coherent energy exchange oscillations, two-mode thermal noise squeezing, and dissipative coupling. Our approach to engineering coherent long-distance interactions with light makes it possible to couple very different systems in a modular way, opening up a range of opportunities for quantum control and coherent feedback networks.

Coherent-feedback Quantum Control with Cold Atomic Spins

2012 ◽  
Author(s):  
Hideo Mabuchi
Keyword(s):  
Quantum Control ◽  
Atomic Spins ◽  
Cold Atomic Spins

scholarly journals Analysis of the strong vertices of Σc∗ND and Σb∗NB in QCD sum rules

2017 ◽  
Vol 32 (35) ◽  
pp. 1750203 ◽  
Author(s):  
Guo-Liang Yu ◽  
Zhi-Gang Wang ◽  
Zhen-Yu Li
Keyword(s):  
Strong Coupling ◽  
Sum Rules ◽  
Form Factors ◽  
Coupling Constants ◽  
Strong Interactions ◽  
Dirac Structure ◽  
Qcd Sum Rules ◽  
Analytical Functions ◽  
Heavy Baryons ◽  
Perturbative Part

The strong coupling constants not only are important to understand the strong interactions of the heavy baryons, but can also help us reveal the nature and structure of these baryons. Additionally, researchers indeed have made great efforts to calculate some of the strong coupling constants, [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], etc. In this paper, we analyze the strong vertices [Formula: see text] and [Formula: see text] using the three-point QCD sum rules under the Dirac structure of [Formula: see text]. We perform our analysis by considering the contributions of the perturbative part and the condensate terms of [Formula: see text] and [Formula: see text]. After the form factors are calculated, they are then fitted into analytical functions which are used to get the strong coupling constants for these two vertices. The final results are [Formula: see text] and [Formula: see text].

CURRENT CORRELATORS AND DUAL DESCRIPTION OF LONG DISTANCE QCD

2002 ◽  
Vol 17 (10) ◽  
pp. 599-607
Author(s):  
H. C. CHANDOLA ◽  
H. C. PANDEY
Keyword(s):  
Fibre Bundle ◽  
Dielectric Behavior ◽  
Strong Interactions ◽  
Macroscopic Description ◽  
Long Distance ◽  
Dielectric Parameters ◽  
Abelian Gauge ◽  
Microscopic Interactions ◽  
Magnetic Symmetry ◽  
Abelian Fields

An attempt has been made to analyze the magnetic symmetry of the non-Abelian gauge theory associated with the strong interactions using the fibre bundle formulation. Utilizing the gauge field topology, the analysis of dual dynamics associated with the non-Abelian fields is shown to have important bearings on the nonperturbative hadronic effects like confinement of colored quarks and gluons inside hadrons. The state of dual superconductivity for the magnetically condensed vacuum has been analyzed to understand the bulk QCD magnetic properties by evaluating the current correlators in magnetic gauge in terms of the dielectric parameters. The dielectric behavior has been shown to lead to the p-4 confining nature to the dual gluon propagators and to provide an effective macroscopic description of the complicated nonperturbative microscopic interactions of charged particles in dual QCD. The p-4 behavior of dual gluon propagator has also been shown to confirm the linearly rising inter-quark confining potential with an explicit dual gluon mass dependency in dual QCD.

PHASES OF QCD FROM SMALL TO LARGE Nf: (SOME) LATTICE RESULTS

2010 ◽  
Vol 25 (27n28) ◽  
pp. 5175-5182 ◽  
Author(s):  
A. DEUZEMAN ◽  
E. PALLANTE ◽  
M. P. LOMBARDO
Keyword(s):  
Phase Transition ◽  
Strong Coupling ◽  
Bulk Phase ◽  
Strong Interactions ◽  
Conformal Theory ◽  
Bare Coupling

We analyze the phases of strong interactions in the space of the flavor number Nf, bare coupling gL, and temperature T by lattice MonteCarlo simulations for two and three unrooted staggered flavors, corresponding to eight and twelve continuum flavors, respectively. We observe a Coulomb-like phase at intermediate lattice couplings which we interpret as the avatar of a continuum conformal theory for Nf = 12. We comment on the possible occurrence of an UVFP associated with the bulk phase transition between the strong coupling lattice phase and the Coulomb-like phase.

scholarly journals EINSTEIN GRAVITY AS AN EMERGENT PHENOMENON?

2001 ◽  
Vol 10 (06) ◽  
pp. 799-806 ◽  
Author(s):  
CARLOS BARCELÓ ◽  
MATT VISSER ◽  
STEFANO LIBERATI
Keyword(s):  
General Relativity ◽  
Quantum Physics ◽  
High Energy ◽  
Einstein Gravity ◽  
Low Energy ◽  
Lorentzian Geometry ◽  
Long Distance ◽  
Emergent Phenomenon ◽  
Effective Dynamics ◽  
The One

In this essay we marshal evidence suggesting that Einstein gravity may be an emergent phenomenon, one that is not "fundamental" but rather is an almost automatic low-energy long-distance consequence of a wide class of theories. Specifically, the emergence of a curved spacetime "effective Lorentzian geometry" is a common generic result of linearizing a classical scalar field theory around some nontrivial background. This explains why so many different "analog models" of general relativity have recently been developed based on condensed matter physics; there is something more fundamental going on. Upon quantizing the linearized fluctuations around this background geometry, the one-loop effective action is guaranteed to contain a term proportional to the Einstein–Hilbert action of general relativity, suggesting that while classical physics is responsible for generating an "effective geometry," quantum physics can be argued to induce an "effective dynamics." This physical picture suggests that Einstein gravity is an emergent low-energy long-distance phenomenon that is insensitive to the details of the high-energy short-distance physics.

scholarly journals Free coherent evolution of a coupled atomic spin system initialized by electron scattering

Science ◽  
2021 ◽  
Vol 372 (6545) ◽  
pp. 964-968
Author(s):  
Lukas M. Veldman ◽  
Laëtitia Farinacci ◽  
Rasa Rejali ◽  
Rik Broekhoven ◽  
Jérémie Gobeil ◽  
...  
Keyword(s):  
Magnetic Interaction ◽  
Scanning Tunneling ◽  
Local Magnetization ◽  
Tunneling Microscopy ◽  
Pump Probe ◽  
Atomic Spin ◽  
Spin Lattice ◽  
Atomic Spins ◽  
Insight Into ◽  
A Current

Full insight into the dynamics of a coupled quantum system depends on the ability to follow the effect of a local excitation in real-time. Here, we trace the free coherent evolution of a pair of coupled atomic spins by means of scanning tunneling microscopy. Rather than using microwave pulses, we use a direct-current pump-probe scheme to detect the local magnetization after a current-induced excitation performed on one of the spins. By making use of magnetic interaction with the probe tip, we are able to tune the relative precession of the spins. We show that only if their Larmor frequencies match, the two spins can entangle, causing angular momentum to be swapped back and forth. These results provide insight into the locality of electron spin scattering and set the stage for controlled migration of a quantum state through an extended spin lattice.

scholarly journals To unite nuclear and sub-nuclear strong interactions

2017 ◽  
Vol 5 (2) ◽  
pp. 104
Author(s):  
Satya Seshavatharam UV ◽  
Lakshminarayana S
Keyword(s):  
Binding Energy ◽  
Strong Coupling ◽  
Charge Radius ◽  
Nuclear Charge ◽  
Strong Coupling Constant ◽  
Strong Interactions ◽  
Nuclear Charge Radius ◽  
Coupling Constant

With reference to ‘reciprocal’ of the strong coupling constant and ‘reduced Compton's wavelength’ of the nucleon, we make an attempt to understand the background of nuclear charge radius, binding energy and stability.

scholarly journals Kick and Fix: The Roots of Quantum Control

Proceedings ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 30 ◽  
Author(s):  
Paolo Facchi ◽  
Saverio Pascazio
Keyword(s):  
Strong Coupling ◽  
Quantum Control ◽  
Strong Coupling Regime ◽  
Historical Survey ◽  
Adiabatic Theorem ◽  
Zeno Effect ◽  
Crucial Problem ◽  
Exponential Operator ◽  
Product Formulas

When two operators A and B do not commute, the calculation of the exponential operator e A + B is a difficult and crucial problem. The applications are vast and diversified: to name but a few examples, quantum evolutions, product formulas, quantum control, Zeno effect. The latter are of great interest in quantum applications and quantum technologies. We present here a historical survey of results and techniques, and discuss differences and similarities. We also highlight the link with the strong coupling regime, via the adiabatic theorem, and contend that the “pulsed” and “continuous” formulations differ only in the order by which two limits are taken, and are but two faces of the same coin.

scholarly journals A comprehensive model of soft interactions in the LHC era

2015 ◽  
Vol 30 (08) ◽  
pp. 1542005 ◽  
Author(s):  
Errol Gotsman ◽  
Eugene Levin ◽  
Uri Maor
Keyword(s):  
High Energy ◽  
Strong Interactions ◽  
Comprehensive Model ◽  
Long Distance ◽  
Theoretical Understanding ◽  
Self Consistent ◽  
Minimal Bias ◽  
Soft Interactions ◽  
High Energy Scattering ◽  
Consistent Approach

In this review we present our model which is an example of the self-consistent approach that incorporates our theoretical understanding of long distance physics, based both on N = 4 SYM for strong coupling and on the matching with the perturbative QCD approach. We demonstrate how important and decisive the LHC data were on strong interactions which led us to a set of the phenomenological parameters that fully confirmed our theoretical expectations, and produced a new picture of the strong interaction at high energy. We also show how far we have come towards creating a framework for the description of minimal bias events for high energy scattering without generating Monte Carlo codes.

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