Optical pulses are used to quantum mechanically entangle two diamonds several centimeters apart.

A method is presented for controlling the outcome of photochemical reactions by using dynamic Stark effect due to a strong, nonresonant infrared field. The application precisely timed laser pulse reversibly modifies potential energy barriers during chemical reaction without inducing any real electronic transitions. Dynamic control (DSC) experimentally demonstrated nonadiabatic reaction, showing substantial modification channel probabilities in dissociation IBr. DSC process nonperturbative...

The ability to store multiple optical modes in a quantum memory allows for increased efficiency of communication and computation. Here we compute the multimode capacity variety protocols based on light storage ensembles atoms. We find that adding controlled inhomogeneous broadening improves this significantly.

We investigate the use of correlated photon pair sources for improved quantum-level detection a target in presence noise background. Photon pairs are generated by spontaneous four-wave mixing, one from each (the herald) is measured locally while other signal) sent to illuminate target. Following diffuse reflection target, signal photons detected receiver and non-classical timing correlations between herald configurable background source. Quantum source can be used provide an enhanced...

We report the storage and retrieval of single photons, via a quantum memory, in optical phonons room-temperature bulk diamond. The THz-bandwidth heralded photons are generated by spontaneous parametric down-conversion mapped to Raman transition, stored for variable delay, released on demand. second-order correlation memory output is g((2))(0)=0.65±0.07, demonstrating preservation nonclassical photon statistics throughout retrieval. low noise, high speed broadly tunable; it therefore promises...

The dynamic Stark effect due to a strong nonresonant but nonionizing laser field provides route quantum control via the creation of novel superposition states. We consider field-free "switched" wave packet through adiabatic turn-on and sudden turn-off interaction. There are two limiting cases for such packets. first is Raman-type coupling, illustrated by molecular axis alignment. An experimental demonstration given. second case that dipole-type charge localization in an array wells.

We investigate strategies for field-free three dimensional molecular axis alignment using strong nonresonant laser fields under experimentally realistic conditions. Using the polarizabilites and rotational constants of an asymmetric top rotor molecule (ethene, ${\mathrm{C}}_{2}{\mathrm{H}}_{4}$), we consider different methods a Boltzmann distribution rotors at 4 K. Specifically, compare use impulsive kick pulses having both linear elliptical polarization to elliptically polarized switched...

Time-resolved photoelectron imaging was used to investigate the dynamical evolution of initially prepared S(1) (ππ*) excited state phenol (hydroxybenzene), catechol (1,2-dihydroxybenzene), resorcinol (1,3-dihydroxybenzene), and hydroquinone (1,4-dihydroxybenzene) following excitation at 267 nm. Our analysis supported by ab initio calculations coupled-cluster CASSCF levels theory. In all cases, we observe rapid (<1 ps) intramolecular vibrational redistribution on potential surface. catechol,...

The dynamic Stark effect is the quasistatic shift in energy levels due to application of optical fields. many ways similar static effect. However, can be applied on rapid time scales and with high energies, comparable those atoms molecules themselves. nonresonant laser fields used a myriad contemporary experiments hold align molecules, shape potential surfaces, make transient birefringence. Five approaches increasing sophistication are describe One application, molecular alignment,...

Optical quantum memories are vital for the scalability of future technologies, enabling long-distance secure communication and local synchronization components. We demonstrate a THz-bandwidth memory light using optical phonon modes room temperature diamond. This large bandwidth makes compatible with down-conversion-type photon sources. that four-wave mixing noise in this system is suppressed by material dispersion. The resulting floor just 7×10(-3) photons per pulse, which establishes...

In this work we investigate quantum-enhanced target detection in the presence of large background noise using multidimensional quantum correlations between photon pairs generated through spontaneous parametric down-conversion. Until now similar experiments have only utilized one pairs' many degrees freedom such as temporal and number correlations. Here, both spectral achieved over an order magnitude reduction to turn significant data acquisition time when compared utilizing modes. We believe...

In order to enhance LIDAR performance metrics such as target detection sensitivity, noise resilience and ranging accuracy, we exploit the strong temporal correlation within photon pairs generated in continuous-wave pumped semiconductor waveguides. The enhancement attained through use of non-classical sources is measured compared a corresponding scheme based on simple photon-counting detection. performances both schemes are quantified by estimation uncertainty Fisher information probe...

The photonic temporal degree of freedom is one the most promising platforms for quantum communication over fiber networks and free-space channels. In particular, time-bin states photons are robust to environmental disturbances, support high-rate communication, can be used in high-dimensional schemes. However, detection remains a challenging task, particularly case that superposition different time bins. Here, we experimentally demonstrate feasibility picosecond light, known as ultrafast...

Abstract We show a simple yet effective method that can be used to characterize the per pixel quantum efficiency and temporal resolution of single photon event camera for imaging applications. Utilizing pairs generated through spontaneous parametric down-conversion, detection each pixel, system, are extracted coincidence measurements. use this evaluate TPX3CAM, with appended image intensifier, measure an average $$7.4\pm 2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">...

As first demonstrated by Hanbury Brown and Twiss, it is possible to observe interference between independent light sources measuring correlations in their intensities rather than amplitudes. In this work, we apply concept of intensity interferometry holography. We combine a signal beam with reference measure cross-correlations using time-tagging single-photon camera. These reveal an pattern from which reconstruct the wavefront both phase. demonstrate principle classical quantum light,...

Light-field microscopy (LFM) extracts volumetric data from a specimen by simultaneously capturing the positional and angular information of light rays emanating sample. While conventional LFM requires compromise between depth field (DOF) resolution, this work introduces quantum approach to eliminate harnessing position-momentum entanglement photon pairs. Compared at same can yield up tenfold improvement in DOF. This illustrates power utilizing multidimensional hopefully will inspire further...

Controlling the properties of single photons is essential for a wide array emerging optical quantum technologies spanning sensing, computing, and communications. Essential components these include photon sources, memories, waveguides, detectors. The ideal spectral operating parameters (wavelength bandwidth) are rarely similar; thus, frequency conversion control key enabling steps component hybridization. Here we perform signal processing by coherently manipulating their spectra via modified...

Abstract Underwater quantum communication has recently been explored using polarization and orbital angular momentum (OAM). Here, we show that spatially structured modes, e.g., a coherent superposition of beams carrying both OAM, can also be used for underwater cryptography. We use the degree freedom to investigate impact channel length on key rates applications. The proves difficult environment establishing as optical turbulence results in significant beam wandering distortions. However,...

We examine the propagation of optical beams possessing different polarization states and spatial modes through Ottawa River in Canada. A Shack-Hartmann wavefront sensor is used to record distorted beam's wavefront. The turbulence underwater channel analysed, associated Zernike coefficients are obtained real-time. Finally, we explore feasibility transmitting as well for applications quantum cryptography.

Determining a beam's full trajectory requires tracking both its position and momentum (angular) information. However, the product of uncertainty in simultaneous measurement two parameters is bound by Heisenberg limit (HUL). In this work, we present proof-of-principle demonstration quantum-enhanced beam technique, leveraging inherent entanglement between photons produced via spontaneous parametric down-conversion (SPDC). We show that quantum can be exploited to achieve accuracy beyond HUL...