scholarly journals Analysis of circuit imperfections in BosonSampling

2015 ◽  
pp. 489-512
Author(s):  
Anthony Leverrier ◽  
Raul Garcia-Patron
Keyword(s):  
Fault Tolerance ◽  
Quantum Computer ◽  
State Of The Art ◽  
Optical Element ◽  
Single Photons ◽  
Linear Optics ◽  
Tolerance Mechanism ◽  
Optical Elements ◽  
Full Quantum

BosonSampling is a problem where a quantum computer offers a provable speedup over classical computers. Its main feature is that it can be solved with current linear optics technology, without the need for a full quantum computer. In this work, we investigate whether an experimentally realistic BosonSampler can really solve BosonSampling without any fault-tolerance mechanism. More precisely, we study how the unavoidable errors linked to an imperfect calibration of the optical elements affect the final result of the computation. We show that the fidelity of each optical element must be at least 1 − O(1/n^2 ), where n refers to the number of single photons in the scheme. Such a requirement seems to be achievable with state-of-the-art equipment.

IMPLEMENTATION OF SWAP GATE AND FREDKIN GATE USING LINEAR OPTICAL ELEMENTS

2013 ◽  
Vol 11 (03) ◽  
pp. 1350031 ◽  
Author(s):  
MENG-ZHENG ZHU ◽  
LIU YE
Keyword(s):  
Photon Number ◽  
Success Probability ◽  
Distinct Advantage ◽  
Single Photons ◽  
Linear Optics ◽  
Optical Elements ◽  
Present Scheme ◽  
Fredkin Gate ◽  
Swap Gate ◽  
Linear Optical Elements

A scheme is proposed to directly implement the optical swap gate and quantum Fredkin gate based on the Mach–Zehnder interferometer (MZI). The distinct advantage of the present scheme is that ancilla single-photons are not needed. The optical swap gate is deterministic and does not need the photon number resolving detectors. The total success probability of the present Fredkin gate can reach 1/16 by using basic linear-optics elements.

scholarly journals Measurement and correction of two-sided freeform optical elements with combined tactile-optical metrology equipment

2019 ◽  
Vol 215 ◽  
pp. 08002
Author(s):  
Johannes Hartung ◽  
Henrik von Lukowicz ◽  
Mathias Rohde ◽  
Knut Kleinbauer ◽  
Nils Heidler ◽  
...  
Keyword(s):  
Iterative Process ◽  
High Performance ◽  
State Of The Art ◽  
Optical Element ◽  
Optical Systems ◽  
Optical Metrology ◽  
Optical Elements ◽  
Process Chains ◽  
Correction Step ◽  
Very High

Freeform optical elements are state of the art for several years to fabricate very high performance optical systems with the necessity of, e.g., strong folding in mirror system or correction of typical asymmetric aberrations in mirror systems as well as lens systems. For freeform mirror systems, in particular for metal mirrors, the metrology is well understood and iterative process chains are well established. For transmission elements with a freeform surface on both sides, manufacturing, metrology, and correction for both sides in a parallel manner is quite difficult. The article presents a method to measure such an optical element and correct it with a well-defined correction step to have both sides in a well-defined position to each other.

Experimental Progress in Linear Optics Quantum Computing

2003 ◽  
Vol 3 (special) ◽  
pp. 553-562
Author(s):  
J.D. Franson ◽  
M.M. Donegan ◽  
M.J. Fitch ◽  
B.C. Jacobs ◽  
T.B. Pittman
Keyword(s):  
Quantum Logic ◽  
Logic Gates ◽  
Memory Device ◽  
High Fidelity ◽  
Single Photons ◽  
Linear Optics ◽  
Optical Elements ◽  
Quantum Logic Gates ◽  
Feed Forward Control ◽  
Logic Operations

Probabilistic quantum logic operations can be performed using linear optical elements and post-selection based on the results of measurements on ancilla photons. We review the results of a number of recent experiments in this area, including the demonstration of several quantum logic gates, the use of feed-forward control, a new source of single photons, and a quantum memory device for single photons. A high-fidelity approach in which the logic gates always produce an output will also be discussed.

scholarly journals Nanooptical elements for visual verification

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alexander Goncharsky ◽  
Anton Goncharsky ◽  
Dmitry Melnik ◽  
Svyatoslav Durlevich
Keyword(s):  
Electron Beam ◽  
Electron Beam Lithography ◽  
Mass Production ◽  
Optical Element ◽  
Visual Image ◽  
Zero Order ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
Standard Equipment ◽  
Diffractive Element

AbstractThis paper focuses on the development of flat diffractive optical elements (DOEs) for protecting banknotes, documents, plastic cards, and securities against counterfeiting. A DOE is a flat diffractive element whose microrelief, when illuminated by white light, forms a visual image consisting of several symbols (digits or letters), which move across the optical element when tilted. The images formed by these elements are asymmetric with respect to the zero order. To form these images, the microrelief of a DOE must itself be asymmetric. The microrelief has a depth of ~ 0.3 microns and is shaped with an accuracy of ~ 10–15 nm using electron-beam lithography. The DOEs developed in this work are securely protected against counterfeiting and can be replicated hundreds of millions of times using standard equipment meant for the mass production of relief holograms.

Efficient linear optics quantum computation

2001 ◽  
Vol 1 (Special) ◽  
pp. 13-19
Author(s):  
G.J. Milburn ◽  
T. Ralph ◽  
A. White ◽  
E. Knill ◽  
R. Laflamme
Keyword(s):  
Quantum Computation ◽  
Single Photon ◽  
Quantum Algorithms ◽  
Optical Nonlinearities ◽  
Linear Optics ◽  
Optical Elements ◽  
Particle Detectors ◽  
Feed Forward ◽  
Single Electrons ◽  
Photon Source

Two qubit gates for photons are generally thought to require exotic materials with huge optical nonlinearities. We show here that, if we accept two qubit gates that only work conditionally, single photon sources, passive linear optics and particle detectors are sufficient for implementing reliable quantum algorithms. The conditional nature of the gates requires feed-forward from the detectors to the optical elements. Without feed forward, non-deterministic quantum computation is possible. We discuss one proposed single photon source based on the surface acoustic wave guiding of single electrons.

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