scholarly journals Nonradiating and radiating modes excited by quantum emitters in open epsilon-near-zero cavities

2016 ◽  
Vol 2 (10) ◽  
pp. e1600987 ◽  
Author(s):  
Iñigo Liberal ◽  
Nader Engheta
Keyword(s):  
Degrees Of Freedom ◽  
Quantum Information Processing ◽  
State Of The Art ◽  
Optical Cavity ◽  
Dynamic Control ◽  
External Boundary ◽  
Dielectric Resonators ◽  
Optical Cavities ◽  
Epsilon Near Zero ◽  
Quantum Emitters

Controlling the emission and interaction properties of quantum emitters (QEs) embedded within an optical cavity is a key technique in engineering light-matter interactions at the nanoscale, as well as in the development of quantum information processing. State-of-the-art optical cavities are based on high quality factor photonic crystals and dielectric resonators. However, wealthier responses might be attainable with cavities carved in more exotic materials. We theoretically investigate the emission and interaction properties of QEs embedded in open epsilon-near-zero (ENZ) cavities. Using analytical methods and numerical simulations, we demonstrate that open ENZ cavities present the unique property of supporting nonradiating modes independently of the geometry of the external boundary of the cavity (shape, size, topology, etc.). Moreover, the possibility of switching between radiating and nonradiating modes enables a dynamic control of the emission by, and the interaction between, QEs. These phenomena provide unprecedented degrees of freedom in controlling and trapping fields within optical cavities, as well as in the design of cavity opto- and acoustomechanical systems.

scholarly journals Engineering spin-orbit synthetic Hamiltonians in liquid-crystal optical cavities

Science ◽  
2019 ◽  
Vol 366 (6466) ◽  
pp. 727-730 ◽  
Author(s):  
Katarzyna Rechcińska ◽  
Mateusz Król ◽  
Rafał Mazur ◽  
Przemysław Morawiak ◽  
Rafał Mirek ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electromagnetic Waves ◽  
Degrees Of Freedom ◽  
Optical Cavity ◽  
Three Dimensional ◽  
Spin Orbit ◽  
Opposite Parity ◽  
Optical Cavities ◽  
Near Resonance ◽  
Spin Orbit Interactions

Spin-orbit interactions lead to distinctive functionalities in photonic systems. They exploit the analogy between the quantum mechanical description of a complex electronic spin-orbit system and synthetic Hamiltonians derived for the propagation of electromagnetic waves in dedicated spatial structures. We realize an artificial Rashba-Dresselhaus spin-orbit interaction in a liquid crystal–filled optical cavity. Three-dimensional tomography in energy-momentum space enabled us to directly evidence the spin-split photon mode in the presence of an artificial spin-orbit coupling. The effect is observed when two orthogonal linear polarized modes of opposite parity are brought near resonance. Engineering of spin-orbit synthetic Hamiltonians in optical cavities opens the door to photonic emulators of quantum Hamiltonians with internal degrees of freedom.

scholarly journals Dynamic control of Purcell enhanced emission of erbium ions in nanoparticles

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Bernardo Casabone ◽  
Chetan Deshmukh ◽  
Shuping Liu ◽  
Diana Serrano ◽  
Alban Ferrier ◽  
...  
Keyword(s):  
Optical Transition ◽  
Optical Cavity ◽  
Dynamic Control ◽  
Photon Emission ◽  
Rare Earth Ion ◽  
Purcell Factor ◽  
Erbium Ions ◽  
Essential Resource ◽  
Dynamical Control ◽  
Quantum Emitters

AbstractThe interaction of single quantum emitters with an optical cavity enables the realization of efficient spin-photon interfaces, an essential resource for quantum networks. The dynamical control of the spontaneous emission rate of quantum emitters in cavities has important implications in quantum technologies, e.g., for shaping the emitted photons’ waveform or for driving coherently the optical transition while preventing photon emission. Here we demonstrate the dynamical control of the Purcell enhanced emission of a small ensemble of erbium ions doped into a nanoparticle. By embedding the nanoparticles into a fully tunable high finesse fiber based optical microcavity, we demonstrate a median Purcell factor of 15 for the ensemble of ions. We also show that we can dynamically control the Purcell enhanced emission by tuning the cavity on and out of resonance, by controlling its length with sub-nanometer precision on a time scale more than two orders of magnitude faster than the natural lifetime of the erbium ions. This capability opens prospects for the realization of efficient nanoscale quantum interfaces between solid-state spins and single telecom photons with controllable waveform, for non-destructive detection of photonic qubits, and for the realization of quantum gates between rare-earth ion qubits coupled to an optical cavity.

Engineering the sensitivity of macroscopic physical systems to variations in the fine-structure constant

2021 ◽  
Author(s):  
Beata Zjawin ◽  
Marcin Bober ◽  
Roman Ciuryło ◽  
Daniel Lisak ◽  
Michał Zawada ◽  
...  
Keyword(s):  
Fine Structure ◽  
Optical Cavity ◽  
Structure Constant ◽  
Relativistic Effects ◽  
Fine Structure Constant ◽  
Sensitivity Factor ◽  
Optical Cavities ◽  
Physical Systems ◽  
Heavy Atoms ◽  
Nuclear Transitions

Abstract Experiments aimed at searching for variations in the fine-structure constant α are based on spectroscopy of transitions in microscopic bound systems, such as atoms and ions, or resonances in optical cavities. The sensitivities of these systems to variations in α are typically on the order of unity and are fixed for a given system. For heavy atoms, highly charged ions and nuclear transitions, the sensitivity can be increased by benefiting from the relativistic effects and favorable arrangement of quantum states. This article proposes a new method for controlling the sensitivity factor of macroscopic physical systems. Specific concepts of optical cavities with tunable sensitivity to α are described. These systems show qualitatively different properties from those of previous studies of the sensitivity of macroscopic systems to variations in α, in which the sensitivity was found to be fixed and fundamentally limited to an order of unity. Although possible experimental constraints attainable with the specific optical cavity arrangements proposed in this article do not yet exceed the present best constraints on α variations, this work paves the way for developing new approaches to searching for variations in the fundamental constants of physics.

scholarly journals Strain induced coupling and quantum information processing with hexagonal boron nitride quantum emitters

2021 ◽  
Author(s):  
Fatemeh Tarighitabesh ◽  
Qaem Hassanzada ◽  
Mohammad Hadian ◽  
Arsalan Hashemi ◽  
Abdolhosseini Sarsari ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Boron Nitride ◽  
Quantum Information Processing ◽  
Hexagonal Boron Nitride ◽  
Quantum Emitters

scholarly journals High-Dimensional Pixel Entanglement: Efficient Generation and Certification

Quantum ◽  
2020 ◽  
Vol 4 ◽  
pp. 376
Author(s):  
Natalia Herrera Valencia ◽  
Vatshal Srivastav ◽  
Matej Pivoluska ◽  
Marcus Huber ◽  
Nicolai Friis ◽  
...  
Keyword(s):  
Carrying Capacity ◽  
Communication Systems ◽  
Degrees Of Freedom ◽  
State Of The Art ◽  
Quality Measurement ◽  
High Dimensional ◽  
Single Photons ◽  
Spatial Mode ◽  
Classical Communication ◽  
Entanglement Of Formation

Photons offer the potential to carry large amounts of information in their spectral, spatial, and polarisation degrees of freedom. While state-of-the-art classical communication systems routinely aim to maximize this information-carrying capacity via wavelength and spatial-mode division multiplexing, quantum systems based on multi-mode entanglement usually suffer from low state quality, long measurement times, and limited encoding capacity. At the same time, entanglement certification methods often rely on assumptions that compromise security. Here we show the certification of photonic high-dimensional entanglement in the transverse position-momentum degree-of-freedom with a record quality, measurement speed, and entanglement dimensionality, without making any assumptions about the state or channels. Using a tailored macro-pixel basis, precise spatial-mode measurements, and a modified entanglement witness, we demonstrate state fidelities of up to 94.4% in a 19-dimensional state-space, entanglement in up to 55 local dimensions, and an entanglement-of-formation of up to 4 ebits. Furthermore, our measurement times show an improvement of more than two orders of magnitude over previous state-of-the-art demonstrations. Our results pave the way for noise-robust quantum networks that saturate the information-carrying capacity of single photons.

scholarly journals Design and simulation of bio fluidic sensor based on photonic crystal

2014 ◽  
Vol 3 (2) ◽  
pp. 106
Author(s):  
Rajini Gaddam Kesava Reddy ◽  
Sharmila Ashok kumar ◽  
Sankardoss Varadhan
Keyword(s):  
Photonic Crystals ◽  
Photonic Band Gap ◽  
Optical Cavity ◽  
Fdtd Method ◽  
High Sensitivity ◽  
Three Dimensions ◽  
Fluidic Channel ◽  
Optical Cavities ◽  
Fluid Sensor ◽  
On Chip

Photonic crystals are materials patterned with a periodicity in dielectric constant in one, two and three dimensions and associated with Bragg scattering which can create range of forbidden frequencies called Photonic Band Gap (PBG). By optimizing various parameters and creating defects, we will review the design and characterization of waveguides, optical cavities and multi-fluidic channel devices. We have used such waveguides and laser nanocavities as Biosensor, in which field intensity is strongly dependent on the type of biofliud and its refractive index. This design and simulation technique leads to development of a nanophotonic sensor for detection of biofluids. In this paper, we have simulated sensing of biofliud in various photonic defect structures with the help of a numerical algorithm called Finite Difference Time Domain (FDTD) method. The simulation result shows the high sensitivity for the change in the bio-molecular structure. For developing the complete sensor system, we have to use the MEMS technologies to integrate on-chip fluidic transport components with sensing systems. The resulting biofluidic system will have the capability to continuously monitor the concentration of a large number of relevant biological molecules continuously from ambulatory patients. Keywords: FDTD, Photonic Crystals, Bio fluid Sensor, Optical Cavity.

Application of Fractional Calculus for Dynamic Problems of Solid Mechanics: Novel Trends and Recent Results

2009 ◽  
Vol 63 (1) ◽  
Author(s):  
Yuriy A. Rossikhin ◽  
Marina V. Shitikova
Keyword(s):  
Fractional Calculus ◽  
Degrees Of Freedom ◽  
Solid Mechanics ◽  
State Of The Art ◽  
Dynamic Problems ◽  
Engineering Problems ◽  
Multilayered Systems ◽  
Linear And Nonlinear ◽  
Linear And Nonlinear Systems

The present state-of-the-art article is devoted to the analysis of new trends and recent results carried out during the last 10years in the field of fractional calculus application to dynamic problems of solid mechanics. This review involves the papers dealing with study of dynamic behavior of linear and nonlinear 1DOF systems, systems with two and more DOFs, as well as linear and nonlinear systems with an infinite number of degrees of freedom: vibrations of rods, beams, plates, shells, suspension combined systems, and multilayered systems. Impact response of viscoelastic rods and plates is considered as well. The results obtained in the field are critically estimated in the light of the present view of the place and role of the fractional calculus in engineering problems and practice. This articles reviews 337 papers and involves 27 figures.

Dynamic Control of Curve-Constrained Hyper-Redundant Manipulators

2004 ◽  
Vol 16 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Shugen Ma ◽  
◽  
Mitsuru Watanabe ◽  
Keyword(s):  
Degrees Of Freedom ◽  
Dynamic Control ◽  
Redundant Manipulators ◽  
Redundant Manipulator ◽  
Real Time Control ◽  
Feed Forward ◽  
Manipulator Dynamics ◽  
Time Control ◽  
Control Scheme ◽  
Feed Forward Controller

Hyper-redundant manipulators have high number of kinematic degrees of freedom, and possess unconventional features such as the ability to enter narrow spaces while avoiding obstacles. To control these hyper-redundant manipulators accurately, manipulator dynamics should be considered. This is, however, time-comsuming and makes implementation of real-time control difficult. In this paper, we propose a dynamic control scheme for hyper-redundant manipulators, which is based on analysis in defined posture space where three parameters were used to determine the manipulator posture. Manipulator dynamics are modeled on the parameterized form with the parameter of the posture space path. The posture space path-tracking feed-forward controller is then formulated on the basis of a parameterized dynamic equation. Computer simulation, in which a hyper-redundant manipulator traces the posture space path well by using the proposed feed-forward controller, proved that the hyper-redundant manipulator tracks the workspace path accurately.

Enhanced spin squeezing and quantum entanglement near the critical point of the Jaynes–Cummings–Dicke model

2017 ◽  
Vol 31 (09) ◽  
pp. 1750062 ◽  
Author(s):  
Aranya B. Bhattacherjee ◽  
Deepti Sharma
Keyword(s):  
Critical Point ◽  
Quantum Entanglement ◽  
Fisher Information ◽  
Quantum Information Processing ◽  
Optical Cavity ◽  
Quantum Fisher Information ◽  
Spin Squeezing ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Superradiant Phase

We investigate spin squeezing (SS) and the quantum Fisher information (QFI) for the Jaynes–Cummings–Dicke (JCD) model in a two-component atomic Bose–Einstein condensate (BEC) inside an optical cavity. Analytical expressions for spin squeezing and the reciprocal of the quantum Fisher information per particle (RMQFI) are derived using the frozen spin approximation. It is shown that in the superradiant phase near the critical point, maximum squeezing and maximum quantum entanglement occur and thus the critical point emerges as a useful resource for precision measurements. In the presence of decoherence and particle loss, we show that gradually with time, even though the ability of squeezing and entanglement generation are weakened, yet significant amounts are still present which can be relevant to quantum information processing and precision spectroscopy.

scholarly journals Absolute and arbitrary orientation of single-molecule shapes

Science ◽  
2021 ◽  
Vol 371 (6531) ◽  
pp. eabd6179
Author(s):  
Ashwin Gopinath ◽  
Chris Thachuk ◽  
Anya Mitskovets ◽  
Harry A. Atwater ◽  
David Kirkpatrick ◽  
...  
Keyword(s):  
Single Molecule ◽  
Degrees Of Freedom ◽  
Large Scale ◽  
Dna Origami ◽  
Excitation Light ◽  
Optical Cavities ◽  
Large Scale Integration ◽  
Unique Maximum ◽  
Modular Platform ◽  
Scale Integration

DNA origami is a modular platform for the combination of molecular and colloidal components to create optical, electronic, and biological devices. Integration of such nanoscale devices with microfabricated connectors and circuits is challenging: Large numbers of freely diffusing devices must be fixed at desired locations with desired alignment. We present a DNA origami molecule whose energy landscape on lithographic binding sites has a unique maximum. This property enabled device alignment within 3.2° on silica surfaces. Orientation was absolute (all degrees of freedom were specified) and arbitrary (the orientation of every molecule was independently specified). The use of orientation to optimize device performance was shown by aligning fluorescent emission dipoles within microfabricated optical cavities. Large-scale integration was demonstrated with an array of 3456 DNA origami with 12 distinct orientations that indicated the polarization of excitation light.

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