Z. Y. Ou’s research while affiliated with University of Rochester and other places

... Our beamsplitter is designed to be symmetric [36] (also see Fig. S1(c)) so the beamsplitter transformations, with reflection coefficient η, are ...

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Developing a platform for linear mechanical quantum computing

... However, if the photons are indistinguishable, they will necessarily pair together; they will never be found in different ports. The latter case is often referred to as the HOM effect [220] and plays a central role in quantum information processing [219], particularly in the engineering and analysis of entangled states in quantum photonics. ...

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Physical Layer Aspects of Quantum Communications: A Survey

... ae¾º j*' *çj &G~V *B ô Ï>î . [1][2][3][4][5]7] ã¾ç~ 7 ¶3f f Ë~ .&7" jF; î~ ç^·ÏöB B~, jF; îöB ö .ae ...

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The fourth-order interference between entangled state photon pairs with different frequencies

... On the other hand, a phase-dependent fourth-order interference effect occurs in Franson interferometer [7], which consists of two highly imbalanced interferometers beyond coherence length [8][9][10]. But it was shown that the effect exists only for two-photon quantum fields and disappears for stationary classical fields in time-unresolved coincidence measurement [11]. The progress on the interference with imbalanced paths was halted until recently when it was reported that phase dependent fourthorder interference between two thermal fields can appear in the time-resolved coincidence between two detectors even when the path imbalance of the interferometer is well beyond the coherence length of the fields [12,13]. ...

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Unbalanced fourth-order interference beyond coherence time

... One alternative is the generation of photonic entanglement by mode-mixing of a pair of single photons on a beam-splitter (see Fig. 1). This has been proposed [17,18] and later experimentally realized with pair of photons from a non-linear process [19,20]. Later, single photons from individual emitters were entangled [21][22][23]. ...

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Polarization-entangled photon pairs from a single molecule

... It relies on measuring intensity correlations of light like in the intensity interferometry technique introduced by Hanbury Brown and Twiss (HBT) (33). The HBT method and its generalizations were applied to a variety of light sources (34)(35)(36)(37)(38)(39)(40)(41)(42), and similarly, our technique might be applied in various scenarios including, for instance, laser and thermal light. ...

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Noise-resistant phase imaging with intensity correlation

... The nonlinear optical process of parametric downconversion (PDC) has been extensively employed to generate quantum states of light structured in the transverse spatial degrees of freedom [1]. In the classical regime, the same process can be operated in the stimulated emission mode (StimPDC) [2,3], providing a convenient platform for the design of quantum optical schemes [4][5][6], and for the study of the interplay between the spatial structures of the interacting light fields in the parametric process [7][8][9][10][11]. In the same way, parametric upconversion plays an important role in a wide variety of applications in quantum and classical optical schemes, as, for instance, frequency conversion of squeezed light fields [12,13] and imaging with visible and invisible light [14,15]. ...

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Observation of a triangular-lattice pattern in nonlinear wave mixing with optical vortices

... It was shown early on that the space-frequency correlation function of cross-spectrally pure fields is independent of the frequency of the input spectra of light [10]. Cross-spectral purity has been studied in various scenarios, such as squeezed light, three-dimensional fields, ghost imaging, and scattering [11][12][13]. In recent years, cross-spectral purity has been extended to vector (or electromagnetic) fields [14][15][16][17][18][19], as well as nonstationary scalar [20,21] and nonstationary electromagnetic light [22][23][24]. ...

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Cross-spectral purity: a generalization of spatiotemporal separability

... If we consider electromagnetic waves from two independent optical emitters without a phase relationship, any first-order interference washes out when detector electronics are too slow to trace rapidly fluctuating electric fields [1]. However, correlation measurements can recover interference effects, in particular when time-resolved single photon detectors are used [2][3][4][5]. ...

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Hong-Ou-Mandel interference of unconventional temporal laser modes

... Among them, the design of beam splitter, which splits incident wave into multiple parts with the same or different intensities, is quite demanding, it has potential applications in optical circuits and communications [1]. In the past, many researchers have considered the behavior of the quantum-mechanical beam splitter [11][12][13][14][15][16][17][18][19]. While the 1 × 2 optical splitters are used routinely (say for instance, Y-and T-branch junctions) [20], the rapidly growing need for space-division multiplexing in optical transmission [21], computing [22] and sensing networks [23] translates into the need for multi-port splitters [24]. ...

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One-way multiple beam splitter designed by quantum-like shortcut-to-adiabatic passage