We present an experimental study of higher-dimensional quantum key distribution protocols based on mutually unbiased bases, implemented by means photons carrying orbital angular momentum. perform ($d+1$) measurements in a classically simulated prepare-and-measure scheme and pair entangled for dimensions ranging from $d=2$ to 5. In our analysis, we pay attention the detection efficiency photon creation probability. As security measures, determine data average error rate, mutual information...

We have built an apparatus capable of attaching a molecule to liquid-helium cluster and obtaining its infrared spectrum. Clusters made few thousand atoms containing ${\mathrm{SF}}_{6}$ show two absorptions located at 945.8 946.1 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ which indicate that the guest is near surface cluster. If contains molecules, spectrum obtained slightly perturbed dimer.

We present an implementation scheme for a quantum walk in the orbital angular momentum space of laser beam. The makes use ring interferometer, containing quarter-wave plate and q plate. This setup enables one to perform arbitrary number steps. In addition, classical nature it possible observe evolution real time. nonquantum entanglement beam's polarization with its implement walk.

The geometry of the generalized Bloch sphere Ω3, state space a qutrit, is studied. Closed form expressions for its boundary ∂Ω3, and set extremals are obtained by use an elementary observation. These analytic methods used to classify 28 two-sections 56 three-sections Ω3 into unitary equivalence classes, completing works earlier authors. It shown, in particular, that there families which equivalent geometrically but not unitarily, feature does appear have been appreciated earlier. A family...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectroscopy in highly quantum matrixes: vibrational spectrum of sulfur hexafluoride ((SF6)n=1,2) attached to helium clustersS. Goyal, D. L. Schutt, and G. ScolesCite this: J. Phys. Chem. 1993, 97, 10, 2236–2245Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://pubs.acs.org/doi/10.1021/j100112a026https://doi.org/10.1021/j100112a026research-articleACS PublicationsRequest...

Quantum Teleportation, the transfer of state one quantum system to another without direct interaction between both systems, is an important way transmit information encoded in states and generate correlations (entanglement) remote systems. So far, for photons, only superpositions two distinguishable (one ``qubit'') could be teleported. Here we show how teleport a ``qudit'', i.e. superposition arbitrary number $d$ present orbital angular momentum single photon using beam splitters additional...

Using an experimental setup that simulates a turbulent atmosphere, we study the secret key rate for quantum distribution (QKD) protocols in orbital angular momentum based free space communication. The QKD under consideration include Ekert 91 protocol different choices of mutually unbiased bases and six-state protocol. We find these decay to zero, roughly at same scale where entanglement formation decays zero.

In a Quantum Walk (QW) the "walker" follows all possible paths at once through principle of quantum superposition, differentiating itself from classical random walks where one path is taken time. This facilitates searching problem solution spaces faster than with walks, and holds promise for advances in dynamical simulation, biological process modelling computation. Current efforts to implement QWs have been hindered by complexity handling single photons inscalability cascading approaches....

Some of the most prominent theoretical predictions modern times, e.g., Unruh effect, Hawking radiation, and gravity-assisted particle creation, are supported by from fact that various quantum constructs like content vacuum fluctuations a field observer-dependent. Despite being fundamental in nature, these have not yet been experimentally verified because one needs extremely strong gravity (or acceleration) to bring them within existing experimental resolution. In this Letter, we demonstrate...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectroscopy of sulfur hexafluoride in and on argon clusters an extended range cluster sizes: finite-size particles attaining bulklike propertiesS. Goyal, G. N. Robinson, D. L. Schutt, ScolesCite this: J. Phys. Chem. 1991, 95, 11, 4186–4189Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1...

Any lossless transformation on ${n}_{s}$ spatial and ${n}_{p}$ internal modes of light can be described by an ${n}_{s}{n}_{p}\ifmmode\times\else\texttimes\fi{}{n}_{s}{n}_{p}$ unitary matrix, but there is no known procedure to effect arbitrary matrix in modes. We devise algorithm realize discrete the combined degrees freedom light. Our realization uses beam splitters operations linear transformations. The number required a reduced as compared existing factor ${n}_{p}^{2}/2$ at cost increasing...

The infrared photodissociation spectra of medium-large argon clusters (n⩽ 103) containing one (or two) active chromophore molecule(s) have been studied using both the conventional seeded expansion method and a 'pick-up' technique for surface deposition guest molecule onto cluster surface. species are spectroscopically characterized by laser photoevaporation with line-tunable CO2 lasers off-axis bolometric detection.The positions vibrational levels interpreted in terms host–chromophore...

Classical optics can be used to efficiently implement certain quantum information processing tasks with a high degree of control, for example, one-dimensional walks through the space orbital angular momentum light directed by its polarization. To explore potential classical light, we here suggest method realize $d$-dimensional optics---an important step towards robust implementation algorithms. In this scheme, different degrees freedom such as frequency, momentum, and time bins, represent...

It is demonstrated that matrix-like spectroscopy may be carried out in the gas phase using molecular beams of clusters and conditions under which bulk-matrix-like behavior achieved are illustrated. At same time, we obtain information on structural evolution noble as a function their size. Infrared spectra for SF6 attached to argon, krypton, xenon were recorded free jet cluster source laser photofragmentation detection technique. When dilute mixture chromophore Ar Kr expanded at relatively...

The evolution of a many-particle system on one-dimensional lattice, subjected to quantum walk can cause spatial entanglement in the lattice position, which be exploited for information/communication purposes. We demonstrate and its dependence coin operation parameters, number particles present steps system. Thus, controlled optimized using discrete-time walk.

Teleportation plays an important role in the communication of quantum information between nodes a network and is viewed as essential ingredient for long-distance Quantum Cryptography. We describe method to teleport carried by photon superposition number d light modes (a "qudit") help additional photons based on transcription. A qudit encoded into single excitation (in our case Laguerre-Gauss which carry orbital angular momentum) transcribed single-rail photonic qubits, are spatially...

We create a multi-partite entangled state by storing single photon in crystal that contains many large atomic ensembles with distinct resonance frequencies. The is re-emitted at well-defined time due to an interference effect analogous multi-slit diffraction. derive lower bound for the number of based on contrast and single-photon character input, we experimentally demonstrate entanglement between over two hundred ensembles, each containing billion atoms. In addition, illustrate fact...

Cat states are coherent quantum superpositions of macroscopically distinct and useful for understanding the boundary between classical world. Due to their macroscopic nature, cat difficult prepare in physical systems. We propose a method create one-dimensional walks using delocalized initial walker. Since can be performed on any system, our proposal enables platform-independent realization states. further show that linear dispersion relation effective walk Hamiltonian, which governs dynamics...

We show the existence of a stable Algebraic Spin Liquid (ASL) phase in Hubbard model defined on honeycomb lattice with spin-dependent hopping that breaks time-reversal symmetry. The effective spin is Kitaev for large on-site repulsion. gaplessness emergent Majorana fermions protected by time reversal (TR) invariance this model. prove TR invariant entire Mott thus ensuring stability ASL. can be physically realized cold atom systems and we propose experimental signals

ADVERTISEMENT RETURN TO ISSUEPREVArticleMolecular solvation in atomic clusters studied by means of molecular beam infrared spectroscopySandeep Goyal, David L. Schutt, and Giacinto ScolesCite this: Acc. Chem. Res. 1993, 26, 3, 123–130Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://pubs.acs.org/doi/10.1021/ar00027a008https://doi.org/10.1021/ar00027a008research-articleACS PublicationsRequest reuse permissionsArticle...

Abstract Discrete-time quantum walks are known to exhibit exotic topological states and phases. Physical realization of in a lossy environment may destroy these We investigate the behaviour presence environment. The environmental effects walk dynamics addressed using non-Hermitian Hamiltonian approach. show that phases robust against moderate losses. order one-dimensional split-step persists as long respects exact $${{\mathcal {P}}}{{\mathcal {T}}}$$ <mml:math...

The state of a quantum system acquires phase factor, called the geometric phase, when taken around closed trajectory in parameter space, which depends only on geometry space. Because its sensitive nature, is instrumental capturing weak effects such as acceleration-induced noninertial field theoretic effects. In this paper, we study response circularly rotating detector inside an electromagnetic cavity. Using cavity, contribution to can be isolated from or strengthened relative inertial...