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International Conference on Quantum Information

Linear Optical Quantum Information Processing, Imaging, and Sensing

Nickolas M. VanMeter, Zhanghan Wu, Hugo V. Cable, Gabriel A. Durkin, Pavel Lougovski, Kishore T. Kapale, Sulakshana Thanvanthri, Dmitry B. Uskov, Christoph F. Wildfeuer, Hwang Lee, Jonathan P. Dowling

Published Jan 1, 2007• 0 citations
Publisher

Abstract

We investigate linear optical approaches to quantum information processing, clarifying how linear optics and projective measurements can be used to create designer optical nonlinearities at the few photon level. We apply the lessons learned to develop optimized schemes for generating entangled photonic states for quantum imaging, with super-resolution below the Rayleigh limit, and for quantum sensing, with super-sensitivity below the shot-noise limit.

DOI
10.1364/icqi.2007.ithg2

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We investigate linear optical approaches to quantum information processing, clarifying how linear optics and projective measurements can be used to create designer optical nonlinearities at the few photon level. We apply the lessons learned to develop optimized schemes for generating entangled photonic states for quantum imaging, with super-resolution below the Rayleigh limit, and for quantum sensing, with super-sensitivity below the shot-noise limit.
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Quantum states of light, such as squeezed states or entangled states, can be used to make measurements (metrology), produce images, and sense objects with a precision that far exceeds what is possible classically, and also exceeds what was once thought to be possible quantum mechanically. The primary idea is to exploit quantum effects to beat the shot-noise limit in metrology and the Rayleigh diffraction limit in imaging and sensing. Quantum optical metrology has received a boost in recent years with an influx of ideas from the rapidly evolving field of optical quantum information processing. Both areas of research exploit the creation and manipulation of quantum-entangled states of light. We will review some of the recent theoretical and experimental advances in this exciting new field of quantum optical metrology, focusing on examples that exploit a particular two-mode entangled photon state – the High-N00N state.
Abstract In previous years the possibility of creating and manipulating quantum states of light has paved the way for the development of new technologies exploiting peculiar properties of quantum states, such as quantum information, quantum metrology and sensing, quantum imaging, etc. In particular quantum imaging addresses the possibility of overcoming limits of classical optics by using quantum resources such as entanglement or sub-Poissonian statistics. Albeit, quantum imaging is a more recent field than other quantum technologies, e.g. quantum information, it is now mature enough for application. Several different protocols have been proposed, some of them only theoretically, others with an experimental implementation and a few of them pointing to a clear application. Here we present a few of the most mature protocols ranging from ghost imaging to sub shot noise imaging and sub-Rayleigh imaging.
The working principles of linear optical quantum computing are based on photodetection, namely, projective measurements. The use of photodetection can provide efficient nonlinear interactions between photons at the single-photon level, which is technically problematic otherwise. We report an application of such a technique to prepare quantum correlations as an important resource for Heisenberg-limited optical interferometry, where the sensitivity of phase measurements can be improved beyond the usual shot-noise limit. Furthermore, using such nonlinearities, optical quantum nondemolition measurements can now be carried out at the single-photon level.
Abstract. The working principles of linear optical quantum computing are based on photodetection, namely, projective measurements. The use of photodetection can provide efficient nonlinear interactions between photons at the single-photon level, which is technically problematic otherwise. We report an application of such a technique to prepare quantum correlations as an important resource for Heisenberglimited optical interferometry, where the sensitivity of phase measurements can be improved beyond the usual shot-noise limit. Furthermore, using such nonlinearities, optical quantum nondemolition measurements can now be carried out at the singlephoton level. § To whom correspondence should be addressed (jonathan.p.dowling@jpl.nasa.gov) From Linear Optical Quantum Computing... 2 1. Effective nonlinearities by projective measurements Looking back, scalable quantum computation with linear optics was considered to be impossible due to the lack of efficient two-qubit logic gates, despite the ease of implementation of one-qubit gates. Two-qubit gates necessarily need a nonlinear interaction between the two photons, and the efficiency of this nonlinear interaction is