We propose a multimode optomechanical system to realize tunable optical nonreciprocity that has the prospect of making an diode for information technology. The proposed model consists two subsystems, each which contains cavities, injected with classical field and quantum signal via 50:50 beam splitter, mechanical oscillator, coupled both cavities coupling. Meanwhile oscillator in subsystem are respectively their corresponding other subsystem. Our scheme yields nonreciprocal effects at...

Based on the flexibility of polymer film, cone-shaped solar cells (PSCs) are fabricated and studied. Effective light trapping is achieved due to multi-absorption in all 360° directions. Monte Carlo ray tracing used simulate absorption PSCs with two variables: wavelength half cone angle. With an inverted indium-tin-oxide-free device structure, a 43% enhanced utilization without loss material realized angle 45°, compared planar PSCs.

Controllable single-photon routing takes the central roles in optical quantum networks for information processing. Given that most of schemes previously proposed are specifically designed photons with selected frequencies, here we investigate how to implement routings single different frequencies. We show capabilities frequencies manipulatable by properly designing configuration scatters such as cavity embedded atoms and channel boundaries. This is particularly important bandwidth future.

We demonstrate a simple rubbing hole injection layer (HIL) to form surface relief gratings (SRGs) on the functional layers of polymer solar cells (PSCs). PSCs studied in this work consist an ITO/PEDOT:PSS(HIL)/P3HT:PCBM(photoactive layer)/LiF/Al structure. SRGs are successfully formed HIL effective process, and over printed photoactive cathode consequently. These triplet change morphologies interfaces PSCs, which can increase optical path lengths, interaction between P3HT chains, interface...

How to achieve the maximal entanglement, for given finite entanglement resources? In this paper, we propose a two-port feedback optical parametric amplifier (TFPA) consisting of nondegenerate (NOPA) and two linear beam splitters. The former is an resource, latter serve as controllers that feed entangled beams generated from NOPA back into its input ports. By manipulating reflectivity splitters phase delays introduced by paths, enhancement can be achieved TFPA. Furthermore, demonstrate such...

A quantum router takes the central role in an optical network. However, how to route expected photons with different frequencies targeted output ports of network is still a basic challenge. Here, we propose effective approach, by setting proper cavity-atom and photon-cavity chiral interactions, realize filter routing single multi-channel With frequency serving as signpost, can be effectively routed modulating detunings between cavities auxiliary atoms. Hopefully, this technique play...

Optimal phase point, where the best sensitivity can be achieved, plays an important role in operation of interferometer. In this paper, we theoretically investigate optimal point SU(1,1) interferometer joint intensity detection and homodyne detection, respectively. We demonstrate that for happens nearby dark fringe with realistic factors considered. The divergence from dependent on initial injection scheme interferometer, strength parametric amplifier inside internal losses system. addition,...

Remote distribution of secret keys is a challenging task in quantum cryptography. A significant step this direction the measurement-device independence key (MDI-QKD). For two remote (or independent) parties Alice and Bob who initially no share information, MDI-QKD enables them to by measurement an untrusted relay. Unfortunately, yields assumption that devices both have be trusted. Here, we show QKD between independent can also realized even if device either or untrusted. We tackle problem...

We realize that an optomechanical system is not only able to measure angular velocity, but also simultaneously estimate position of the corresponding rotation axis. To implement simultaneous estimation, we first propose a multiparameter estimation scheme through consists two subsystems. The velocity and rotation-axis are jointly sensed by tested mass then estimated radiation exiting from cavity due coupling. adequately consider nuisance angles, which arise unexpected misalignment system,...

We theoretically investigate the high-precision estimation of coupling rate, which can reflect an actual observable, in a hybrid optomechanical system (OMS). In our scheme, apart from optical cavity, mechanical vibrator is also coupled to two-level (TLS) via direct dispersive coupling. As for initial state, we take into account coherent states both and modes. After evolving period vibrator, final state then carries information about estimated rate. find that through measuring internal TLS,...

Quantum information processing with geometric features of quantum states may provide promising noise-resilient schemes for metrology. In this work, we theoretically explore phase-space Sagnac interferometers trapped atomic clocks rotation sensing, which could be intrinsically robust to certain decoherence noises and reach high precision. With the wave guide provided by sweeping ring traps, give criteria under well-known phase is a pure or unconventional respect space. Furthermore,...

We derive a general phase-matching condition (PMC) for enhancement of sensitivity in SU(1,1) interferometers. Under this condition, the quantum Fisher information (QFI) two-mode interferometry becomes maximal with respect to relative phase two modes, case an arbitrary state one input port and even (odd) other port, is enhanced. also find that optimal parameters can let QFI some areas achieve Heisenberg limit both pure mixed initial states. As examples, we consider several states: coherent...

Surface energy modification was utilized in the fabrication of hollow transmission Fabry-Perot interferometer (FPI) for first time. Polydimethylsiloxane (PDMS) used to modify surface substrate self-assembly poly(vinylidenefluoride-trifluoroethylene) [P(VDF-TrFE)] 70/30 mol% copolymer film on given areas, which is simple and low destructive photoelectric device. A strain 7.12% under a field 22.3 MV/m observed from film, led FPI with tunable range 54 nm at wavelength 604 nm.

A physical model for Geant4-based simulation of the galactic cosmic ray (GCR) particles' interaction with lunar surface matter has been developed to investigate production rates cosmogenic nuclei. In this GCRs, mainly very high energy protons and α particles, bombard Moon produce many secondary such as neutrons. The energies neutrons at different depths are recorded saved ROOT files, analytical expressions differential proton neutron fluxes obtained through best-fit procedure using software....

As an employment of surface plasmonic effect, the consequence insertion a layer Ag clusters into polymer solar cell on enhancement light absorption and power conversion efficiency is investigated.Optical analysis based finite-difference time-domain (FDTD) performed with experiments to evaluate effect interaction between incident in cell.Ag modify wave vector electromagnetic field inside device redistributed enhanced.As result, cells achieve overall increase absorption, short-circuit current...

Abstract We theoretically investigate that mechanical quantum squeezing in a dissipative optomechanical system, driven by two driving tones, can be improved through quadratic dispersive coupling (QDC) which appears adjusting membrane an appropriate position of optical cavity. The analytical expressions are derived for revealing the intrinsic mechanism improvement. Remarkably, compared with case without QDC, optimal condition involved QDC is found to considerably enhance squeezing, reducing...

The trapped ion rotation sensor has been shown its superiority for measurement recently. Thus, we continue exploring potential to enhance the precision by analyzing quantum Fisher information. We respectively calculate cases where initial oscillatory states of ions are coherent and even (odd) states. It is found that phases these can be tuned acquire high precision. In with phonon losses, appropriate further revealed optimizing sensor. Moreover, our results display that, in case...

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A physical model of Geant4-based simulation galactic cosmic ray (GCR) particles interaction with the lunar surface matter has been developed to investigate production rate cosmogenic nuclei. In this GCRs, mainly very high energy protons and $α$ particles, bombard Moon produce many secondary such as neutrons. The energies proton neutron at different depths are recorded saved into ROOT files, analytical expressions for differential fluxes obtained through best-fit procedure under software. To...

We investigate the game of cop and robber, playing on a finite graph between one robber. The robber can spend move to build road any other vertices or stay at his position. Several results are provided toward find characteristics graphs which win.

We propose a scheme for generating continuous-variable (CV) quadripartite unlockable bound entangled state from cascaded four-wave mixing processes. Different the previous method involving bipartite and two thermal states, our results show that CV can be generated via internal reconfiguration of four-mode state. Both nondistillability superactivation demonstrated. believe is experimentally accessible will contribute to deeper understanding multipartite entanglement.