Abstract All-optical photonic devices are crucial for many important technologies and applications, ranging from optical communication to quantum information processing. Conventional design of all-optical is based on photon propagation interference in real space, which may rely large numbers elements, the requirement precise control makes this approach challenging. Here we propose an unconventional route engineering using photon’s internal degrees freedom, form crystals such synthetic...

We propose a scheme to simulate topological physics within single degenerate cavity, whose modes are mapped lattice sites. A crucial ingredient of the is construct sharp boundary so that open condition can be implemented for this effective system. In doing so, properties system manifest themselves on edge states, which probed from spectrum an output cavity field. demonstrate with two examples: static Su-Schrieffer-Heeger chain and periodically driven Floquet insulator. Our work opens up new...

Exceptional points (EPs), at which more than one eigenvalue and eigenvector coalesce, are unique spectral features of non-Hermiticity (NH) systems. They exist widely in open systems with complex energy spectra. We experimentally demonstrate the appearance paired EPs a periodical-driven degenerate optical cavity along synthetic orbital angular momentum dimension tunable parameter. The complex-energy band structures key EPs, i.e., their bulk Fermi arcs, parity-time symmetry breaking...

We propose a technique to couple the position operator of nanomechanical resonator SQUID device by modulating its magnetic flux bias. By tuning field properly, either linear or quadratic couplings can be realized, with discretely adjustable coupling strength. This provides way realize coherent nonlinear effects in it Josephson quantum circuit. As an example, we show how squeezing state realized this technique. also simple method measure uncertainty without tomography.

We propose a scheme to realize the two-axis countertwisting spin-squeezing Hamiltonian inside an optical cavity with aid of phase-locked atom-photon coupling. By careful analysis and extensive simulation, we demonstrate that our is robust against dissipation caused by loss atomic spontaneous emission, it can achieve significantly higher squeezing than one-axis twisting. further show how idea be extended generate two-mode spin-squeezed states in two coupled cavities. Because its easy...

The same method used to determine ${\ensuremath{\sigma}}^{*}$ excitations in the x-ray-absorption spectra of organic molecules is applied analyze structure band x-ray absorption amorphous carbon $(a\ensuremath{-}\mathrm{C})$ films. analysis assumes that only a $\ensuremath{\sigma}$ bond interaction first neighbors relevant explain a-C This justified by local character probe and short- range order existing these identification different components based on dependence binding energy with...

Most quantum computer realizations require the ability to apply local fields and tune couplings between qubits, in order realize single bit two gates which are necessary for universal computation. We present a scheme remove necessity of switching qubits gates, more costly many cases. Our strategy is compute with encoded out carefully designed interaction free subspaces analogous decoherence subspaces. give examples show how computation realized our manipulations physical only, both diagonal...

Synthetic dimensions based on particles' internal degrees of freedom, such as frequency, spatial modes and arrival time, have attracted significant attention. They offer ideal large-scale lattices to simulate nontrivial topological phenomena. Exploring more synthetic is one the paths toward higher dimensional physics. In this work, we design experimentally control coupling among consisting intrinsic photonic orbital angular momentum spin freedom in a degenerate optical resonant cavity, which...

Ferroelectric and magnetoresistance heterostructure (Ba,Sr)TiO3/(La,Sr)MnO3 (BST/LSMO) is deposited epitaxially on SrTiO3 (001) substrate by pulse laser deposition. The phase structures of the BST/LSMO are characterized x-ray diffraction. Cross-sectional transmission electron microscope shows a substantial interdiffusision between BST LSMO layers. dielectric properties conductivity measured as function temperature, frequency, electric field. constant dependence field, ε vs E, exhibits strong...

We combine the ideas of qubit encoding and dispersive dynamics to enable robust easy quantum information processing (QIP) on paired superconducting charge boxes sharing a common bias lead. establish decoherence free subspace these introduce universal gates by interaction with LC resonator inductive couplings between encoded qubits. These preserve code space only require established local symmetry control voltage bias.

In this work, a planar structured GaN/CuI heterojunction ultraviolet photodetector (UVPD) with self-powered manner was constructed by the spin-coating method. Both UVA and UVC waveband lights were precisely detected designed PD. Irradiated upon 365 nm light, our PD device performed decent photoresponse properties photo-to-dark current ratio (PDCR) of 1.3 × 10 3 , responsivity 228 mA/W, specific detectivity 4.3 13 Jones at zero bias. There barely degeneration in photocurrent during continuous...

The thermal decomposition temperature and the superconductivity of nine substituted systems (Y is by Gd, Dy, Pr; Ba Sr, Ca; Cu Sn, Al, Zn, Ni, respectively) were studied systematically. results reveal that there a close relationship between ${\mathit{T}}_{\mathit{c}}$ temperature, always suppressed as lowered. authors consider stability may be one predominant factors for superconductivity.

The authors have studied the effects of film thickness on lattice strain and in-plane dielectric ferroelectric properties Ba0.7Sr0.3TiO3 thin films epitaxially grown LaAlO3 (001) single crystal substrates. With increasing from 20to300nm, parameter (a) increased 0.395to0.402nm while out-of-plane (c) remained almost unchanged, which led to an a∕c ratio (tetragonality) changing 0.998 1.012 consequently resulted in a shift Curie temperature 306to360K associated with increase remnant polarization...

We study a quantum computing system using microwave photons in transmission line resonators on superconducting chip as qubits. show that linear optics and other controls necessary for can be implemented by coupling to Josephson devices the same chip. By taking advantage of strong nonlinearities junctions, photonic qubit interactions realized. analyze gate error rate demonstrate our scheme is realistic even with limited decoherence times. As conceptually innovative solution based existing...

We report the optical response characteristics of Al/Ti bilayer transition edge sensors (TESs), which are mainly comprised thermometers and suspended SiN membranes for thermal isolation. The measurement was performed in a 3He sorption refrigerator device's to pulses investigated using pulsed laser source. Based on these measurements, we obtained effective recovery time (τeff) devices at different biases discussed dependence τeff bias. device with 940 μm × continuous membrane demonstrated...

Thin films of La0.7Sr0.3MnO3 (LSMO) have been grown on the ferroelectric 0.68Pb(Mg1∕3Nb2∕3)O3–0.32PbTiO3 (PMN-PT) single-crystal substrates. The polarization PMN-PT induces a large decrease in resistivity and an upward shift Curie temperature LSMO films, which was interpreted terms induced reduction biaxial tensile strain films. can be dynamically tuned by applying dc electric fields across polarized PMN-PT. analyses results indicate that field lattice via converse piezoelectric effect...

We investigate how to concatenate different decoherence-free subspaces realize scalable universal fault-tolerant quantum computation. Based on tunable $XXZ$ interactions, we present an architecture for computers which can fault-tolerantly perform computation by manipulating only a single type of parameter. By using the concept interaction-free subspaces, eliminate need tune couplings between logical qubits, further reduces technical difficulties implementing

We study the light-front Schwinger model at finite temperature following recent proposal of Alves, Das, and Perez. show that calculations are carried out efficiently by working with full propagator for fermion, which also avoids subtleties arise regularizations. demonstrate this calculation zero anomaly. dependent corrections to anomaly vanish, consistent results from in conventional quantization. The gauge self-energy is seen have expected nonanalytic behavior temperature, but does not...

The heterostructure of Pt/Ba0.5Sr0.5TiO3/La0.67Sr0.33MnO3 (Pt/BST/LSMO) with the BST thickness ranging from 120 to 550 nm was fabricated by pulsed laser deposition. dielectric constant (e) measured under different electrical fields (E) and frequency (f). A strong dependence value e, e–E e–f were observed, which can be well explained series-capacitor model, based on assumption that electrically consists a 'bulk' layer an interfacial between Pt layers. properties interface obtained. At room...

The dynamics of an open quantum system is non-Markovian when memory effect non-negligible. a very complex issue and presently there no universally accepted method to quantify it. By examining the kernel Nakajima-Zwanzig master equation, we study in theoretical model consisting spin coupled environment Ising chain subject transverse field. We find that it can be dictated by either time correlation environment, or system-environment correlation, depending on strength field state environment....