Showing 2001 · quant-phShow all

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quant-ph2001★ 53 cited

Entangled-Photon Generation from Parametric Down-Conversion in Media with Inhomogeneous Nonlinearity

Giovanni Di Giuseppe, Mete Atature, Matthew D. Shaw +3

We develop and experimentally verify a theory of Type-II spontaneous parametric down-conversion (SPDC) in media with inhomogeneous distributions of second-order nonlinearity. As a…

quant-ph2001★ 43 cited

Multi-parameter Entanglement in Quantum Interferometry

Mete Atature, Giovanni Di Giuseppe, Matthew D. Shaw +3

The role of multi-parameter entanglement in quantum interference from collinear type-II spontaneous parametric down-conversion is explored using a variety of aperture shapes and si…

quant-ph2001★ 1 cited

Information and Distinguishability of Ensembles of Identical Quantum States

Lev B. Levitin, Tommaso Toffoli, Zac D. Walton

We consider a fixed quantum measurement performed over identical copies of quantum states. Using a rigorous notion of distinguishability We consider a fixed quantum measurement…

quant-ph2001★ 87 cited

Demonstration of the Complementarity of One- and Two-Photon Interference

A. F. Abouraddy, M. B. Nasr, B. E. A. Saleh +2

The visibilities of second-order (single-photon) and fourth-order (two-photon) interference have been observed in a Young's double-slit experiment using light generated by spontane…

quant-ph2001★ 272 cited

Quantum optical coherence tomography with dispersion cancellation

Ayman F. Abouraddy, Magued B. Nasr, Bahaa E. A. Saleh +2

We propose a new technique, called quantum optical coherence tomography (QOCT), for carrying out tomographic measurements with dispersion-cancelled resolution. The technique can al…

quant-ph2001★ 153 cited

Entangled-photon Fourier optics

Ayman F. Abouraddy, Bahaa E. A. Saleh, Alexander V. Sergienko +1

Entangled photons, generated by spontaneous parametric down-conversion from a second-order nonlinear crystal, present a rich potential for imaging and image-processing applications…

quant-ph2001★ 83 cited

Degree of entanglement for two qubits

Ayman F. Abouraddy, Bahaa E. A. Saleh, Alexander V. Sergienko +1

We demonstrate that any pure bipartite state of two qubits may be decomposed into a superposition of a maximally entangled state and an orthogonal factorizable one. Although there…

quant-ph2001★ 56 cited

Quantum Entanglement and the Two-Photon Stokes Parameters

Ayman F. Abouraddy, Alexander V. Sergienko, Bahaa E. A. Saleh +1

A formalism for two-photon Stokes parameters is introduced to describe the polarization entanglement of photon pairs. This leads to the definition of a degree of two-photon polariz…

quant-ph2001★ 33 cited

Multi-Parameter Entanglement in Femtosecond Parametric Down-Conversion

Mete Atature, Giovanni Di Giuseppe, Matthew D. Shaw +3

A theory of spontaneous parametric down-conversion, which gives rise to a quantum state that is entangled in multiple parameters, such as three-dimensional wavevector and polarizat…

quant-ph2001★ 35 cited

Ellipsometric measurements by use of photon pairs generated by spontaneous parametric down-conversion

Ayman F. Abouraddy, Kimani C. Toussaint, Alexander V. Sergienko +2

We present a novel interferometric technique for performing ellipsometric measurements. This technique relies on the use of a non-classical optical source, namely, polarization-ent…

quant-ph2001★ 86 cited

Quantum Holography

Ayman F. Abouraddy, Bahaa E. A. Saleh, Alexander V. Sergienko +1

We propose to make use of quantum entanglement for extracting holographic information about a remote 3-D object in a confined space which light enters, but from which it cannot esc…

quant-ph2001★ 29 cited

Biphoton focusing for two-photon excitation

Magued B. Nasr, Ayman F. Abouraddy, Mark C. Booth +5

We study two-photon excitation using biphotons generated via the process of spontaneous parametric down-conversion in a nonlinear crystal. We show that the focusing of these biphot…

quant-ph2001★ 326 cited

Role of entanglement in two-photon imaging

Ayman F. Abouraddy, Bahaa E. A. Saleh, Alexander V. Sergienko +1

The use of entangled photons in an imaging system can exhibit effects that cannot be mimicked by any other two-photon source, whatever the strength of the correlations between the…

quant-ph2001★ 4 cited

Counting, Fanout, and the Complexity of Quantum ACC

Frederic Green, Steven Homer, Cristopher Moore +1

We propose definitions of $\QAC^0$, the quantum analog of the classical class $\AC^0$ of constant-depth circuits with AND and OR gates of arbitrary fan-in, and $\QACC[q]$, the anal…

quant-ph2001★ 282 cited

Revisiting Hardy's Paradox: Counterfactual Statements, Real Measurements, Entanglement and Weak Values

Yakir Aharonov, Alonso Botero, Sandu Popescu +2

Classical-realistic analysis of entangled systems have lead to retrodiction paradoxes, which ordinarily have been dismissed on the grounds of counter-factuality. Instead, we claim…

quant-ph2001★ 20 cited

Performance of Photon-Pair Quantum Key Distribution Systems

Z. Walton, A. V. Sergienko, M. Atature +2

We analyze the quantitative improvement in performance provided by a novel quantum key distribution (QKD) system that employs a correlated photon source (CPS) and a photon-number r…