aqora

Pure single photon generation

Peter J. Mosley, Christine Silberhorn, Alfred B. U’Ren +1 more

We propose a method of creating single photons in pure quantum states by parametric downconversion, along with the analysis of an experimental scheme for characterising their purity using multiple crystal interferometry.

Quantum Electronics and Laser Science ConferenceDec 10, 20050 citations

Precise creation, characterization, and manipulation of single optical qubits

Nicholas A. Peters, Joseph B. Altepeter, Evan R. Jeffrey +2 more

We present the theoretical basis for and experimental verification of arbitrary single-qubit state generation, using the polarization of photons generated via spontaneous parametric downconversion. Our precision measurement and state reconstruction system has the capability to distinguish over 3 million states, all of which can be reproducibly generated using our state creation apparatus. In order to complete the triumvirate of single qubit control, there must be a way to not only manipulate single qubits after creation and before measurement, but a way to characterize the manipulations themselves. We present a general representation of arbitrary processes, and experimental techniques for generating a variety of single qubit manipulations, including unitary, decohering, and (partially) polarizing operations.We present the theoretical basis for and experimental verification of arbitrary single-qubit state generation, using the polarization of photons generated via spontaneous parametric downconversion. Our precision measurement and state reconstruction system has the capability to distinguish over 3 million states, all of which can be reproducibly generated using our state creation apparatus. In order to complete the triumvirate of single qubit control, there must be a way to not only manipulate single qubits after creation and before measurement, but a way to characterize the manipulations themselves. We present a general representation of arbitrary processes, and experimental techniques for generating a variety of single qubit manipulations, including unitary, decohering, and (partially) polarizing operations.

arXiv:quant-ph/0502177Quantum Information and ComputationOct 1, 200325 citations

Taming Entanglement

Paul G. Kwiat, Joe Altepeter, David A. Branning +3 more

Using a spontaneous parametric-downconversion source of photon pairs, we are working towards the creation of arbitrary 2-qubit quantum states with high fidelity. Currently, all physically allowable combinations of polarization entanglement and mixture can be produced, including maximally-entangled mixed states. The states are experimentally measured and refined via computer-automated quantum-state tomography, and this system has also been used to perform single-qubit and ancilla-assisted quantum process tomography.Using a spontaneous parametric-downconversion source of photon pairs, we are working towards the creation of arbitrary 2-qubit quantum states with high fidelity. Currently, all physically allowable combinations of polarization entanglement and mixture can be produced, including maximally-entangled mixed states. The states are experimentally measured and refined via computer-automated quantum-state tomography, and this system has also been used to perform single-qubit and ancilla-assisted quantum process tomography.

arXiv:quant-ph/0303040Mar 7, 20034 citations

Optically Controlled Semiconductor Spin Qubits and Indistinguishable Single Photons for Quantum Information Processing

Y. Yamamoto

Elsevier eBooksJan 1, 20110 citations

Single Qubit Arbitrary Unitary Synthesis using Photonic Spectral Encoding

R. Raghunathan, Ricard Guillaume, Filippo M. Miatto +2 more

Sep 5, 20180 citations

Full-mode characterization of correlated photon pairs generated in spontaneous downconversion

Alessio D’Errico, Felix Hufnagel, Filippo Miatto +2 more

Spontaneous parametric downconversion is the primary source to generate entangled photon pairs in quantum photonics laboratories. Depending on the experimental design, the generated photon pairs can be correlated in the frequency spectrum, polarization, position-momentum, and spatial modes. Exploring the spatial modes' correlation has hitherto been limited to the polar coordinates' azimuthal angle, and a few attempts to study Walsh mode's radial states. Here, we study the full-mode correlation, on a Laguerre-Gauss basis, between photon pairs generated in a type-I crystal. Furthermore, we explore the effect of a structured pump beam possessing different spatial modes onto bi-photon spatial correlation. Finally, we use the capability to project over arbitrary spatial mode superpositions to perform the bi-photon state's full quantum tomography in a 16-dimensional subspace.Spontaneous parametric downconversion is the primary source to generate entangled photon pairs in quantum photonics laboratories. Depending on the experimental design, the generated photon pairs can be correlated in the frequency spectrum, polarization, position-momentum, and spatial modes. Exploring the spatial modes' correlation has hitherto been limited to the polar coordinates' azimuthal angle, and a few attempts to study Walsh mode's radial states. Here, we study the full-mode correlation, on a Laguerre-Gauss basis, between photon pairs generated in a type-I crystal. Furthermore, we explore the effect of a structured pump beam possessing different spatial modes onto bi-photon spatial correlation. Finally, we use the capability to project over arbitrary spatial mode superpositions to perform the bi-photon state's full quantum tomography in a 16-dimensional subspace.

arXiv:2103.08689Optics LettersApr 19, 202121 citations

Precise creation, characterization, and manipulation of single optical qubits

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Precise creation, characterization, and manipulation of single optical qubits

Abstract

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