The Rayleigh limit has so far applied to all microscopy techniques that rely on linear optical interaction and detection in the field. Here we demonstrate detecting light emitted by an object higher-order transverse electromagnetic modes (TEMs) can help achieving sub-Rayleigh precision for a variety of microscopy-related tasks. Using heterodyne TEM01, measure position coherently incoherently emitting objects within 0.0015 0.012 limit, respectively, determine distance between two positioned...

We propose a quantum memory based on the precreated long-lived macroscopic coherence. It is shown that proposed approach provides new physical properties and methods for retrieval of signal light fields improvement basic parameters memory. demonstrate how coherence can enable storage with low noise programmable demand in atomic ensembles natural inhomogeneous broadening. The feasibility implementing this proposal various crystals doped rare earth ions, as well gases Raman transition...

Microwave quantum memory promises advanced capabilities for noisy intermediate-scale superconducting computers. Existing approaches to microwave lack complete combination of high efficiency, long storage time, noiselessness and multi-qubit capacity. Here we report an efficient broadband multimode memory. The stores two spectral modes single photon level radiation in on-chip system eight coplanar resonators. Single mode shows a power efficiency up $60\pm 3\%$ at energy more than $73\pm higher...

We demonstrate that a photon echo can be implemented by all-optical means using an array of on-chip high-finesse ring cavities whose parameters are chirped in such way as to support equidistant spectra cavity modes. When launched into system, classical or quantum optical signal—even single-photon field—becomes distributed between individual cavities, giving rise prominent coherence revivals at well-defined delay times, controlled the chirp parameters. This effect enables long storage times...

We present a scheme of quantum repeater that uses entangled multimode coherent states are obtained by electro-optic modulation symmetric and antisymmetric Schr\"odinger cat states. Part the generated frequency modes is sent to beam splitter at central node, while remaining stored locally in memories. The between remote memories conditionally prepared photon-counting measurements output channels splitter. study how effects decoherence channel affect statistics photocounts and, for heralding...

Abstract We seek to design experimentally feasible broadband, temporally multiplexed optical quantum memory with near-term applications telecom bands. Specifically, we devise dispersion compensation (DC) for an impedance-matched narrow-band by exploiting Raman processes over two three-level atomic subensembles, one and the other DC. DC provides impedance matching more than a full cavity linewidth. Combined 1 s spin-coherence lifetime could be capable of power efficiency exceeding 90% leading...

We derive the area theorem for light pulses interacting with inhomogeneously broadened ensemble of two-level atoms in a single-mode optical waveguide and present its analytical solution Gaussian-type modes, which demonstrates significant difference from formation $2\pi$ by plane waves. generalize this to description photon echo apply it two-pulse (primary) revival silenced (ROSE) protocol quantum memory. For first time, we implemented ROSE laser-written made an optically thin crystal...

We have proposed a compact scheme of quantum random access memory (qRAM) based on the impedance matched multi-qubit photon echo incorporated with control four-level atom in two coupled QED cavities. A set matching conditions for basic physical parameters qRAM that provides an efficient fast single storage and readout has been found. In particular, it discovered operations are determined by specific properties excited photonic molecule coupling Herein, maximal efficiency is realized when...

We have found a new hidden symmetry of time reversal light–atom interaction in the photon echo quantum memory with Raman atomic transition. The time-reversed creates generalized conditions for ideal compression/decompression duration input light pulses and its wavelength. Based on general analytical approach to this scheme, we studied optimal field resonant systems characterized by realistic spectral properties. demonstrated necessary effective conversion waveform wavelength are also...

Abstract We show that, under certain circumstances, an optical field in a two-mode squeezed vacuum (TMSV) state can propagate through lossy atomic medium without degradation or evolution. Moreover, the losses give rise to that when different is initially injected into medium. Such situation emerges Λ-type system, which both transitions are driven by strong laser fields two-photon resonant with respective signal modes. Then interactions of two modes ground-state coherence interfere...

We report a quantum key distribution using subcarrier wave encoding in Plug&Play configuration. Our detailed study shows how operates presence of Rayleigh back-scattering, chromatic dispersion and other experimental negative factors that occur propose experimentally demonstrate novel regime for the encoding, where simultaneous detection two logical states single basis is combined with robustness simplicity original protocol. This deep modulation reliable communication losses up to 20 dB...

Quantum key distribution with multimode subcarrier wave encoding is propitious for being robust against environmental disturbance. For application in long-distance quantum communications this has to be compatible entanglement-assisted repeaters that are commonly designed work dual rail encodings. We propose and demonstrate an interface between encodings a fidelity of more than 92\% using linear optical circuit. The developed scheme may find future heterogeneous networks combine trusted...

Tapered optical fibers (nanofibers) whose diameters are smaller than the wavelength very fragile and can be easily destroyed if excessively heated by energy dissipated from transmitted light. We present a technique for monitoring nanofiber temperature using two-stage heterodyne detection. The phase of output signal is determined that field, which, in turn, depends on through refractive index. From data, numerically solving heat exchange equations, distribution along determined. applied to...

Based on new obtained analytical results, the main properties of photon echo quantum memory protocols are analysed and discussed together with recently achieved experimental results. The attention is paid to studying influence spectral dispersion nonlinear interaction light pulses resonant atoms. distinctive features effect storage broadband signal in studied identified discussed. Using area theorem, closed solutions for obtained, describing weak intense pulses, allowing us find conditions...

We show that swallowtail catastrophe consisting of various-order non-Hermitian and Hermitian degeneracies naturally exists in the dynamics two-mode driven-dissipative quadrature squeezing systems break pseudo-Hermiciticy by judiciously engineered losses. reveal degeneracy structure enables nontrivial braiding complex eigenvalues looping around an exceptional line parameter space. Our findings provide a comprehensive understanding geometry bosonic quadratic systems, opening pathways toward...

We show that swallowtail catastrophe consisting of various-order non-Hermitian and Hermitian degeneracies naturally exists in the dynamics two-mode driven-dissipative quadrature squeezing systems break pseudo-Hermiciticy by judiciously engineered losses. reveal degeneracy structure enables nontrivial braiding complex eigenvalues looping around an exceptional line parameter space. Our findings provide a comprehensive understanding geometry bosonic quadratic systems, opening new pathways...

Low loss magnetic surface plasmon polariton (SPP) modes characterized by enhanced electrical field component and subwavelength confinement on the dielectric negative-index metamaterial interface are presented. We demonstrate a possibility of storage perfect retrieval low SPP fields using photon echo quantum memory Raman atomic transition. describe specific properties proposed technique which opens for efficient nano scale multi-mode memory.

The Rayleigh limit has so far applied to all microscopy techniques that rely on linear optical interaction and detection in the field. Here we demonstrate detecting light emitted by an object higher-order transverse electromagnetic modes (TEMs) can help achieving sub-Rayleigh precision for a variety of microscopy-related tasks. Using heterodyne TEM01, measure position coherently incoherently emitting objects within 0.0015 0.012 limit, respectively, determine distance between two slits...

We perform balanced homodyne detection of the electromagnetic field in a single-mode tapered optical nanofiber surrounded by rubidium atoms magneto-optical trap. Resonant fluorescence into mode manifests itself as increased quantum noise quadratures. The autocorrelation function detector's output photocurrent exhibits exponential fall-off with decay time constant 26.3±0.6 ns, which is consistent theoretical expectation under our experimental conditions. To best knowledge, this first...