Optical Quantum Logic at the Ultimate Limit

Parkins, Scott

doi:10.1103/physics.9.129

Cited by 3 publications

(3 citation statements)

References 34 publications

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“…Independent of these applications, there is a long and rich theoretical history of studying the field theory of scattered photons from a spatially-extended self-Kerr medium [9][10][11][12][13][14][15][16][17]. Due to experimental advances [18,19], there is renewed interest in such a medium in the context of Rydberg vapors [20][21][22], coupled nonlinear cavities [23][24][25], and even scattering from point-like Kerr interactions [8,[26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Two-photon self-Kerr nonlinearities for quantum computing and quantum optics

Combes

Brod

2018

Phys. Rev. A

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The self-Kerr interaction is an optical nonlinearity that produces a phase shift proportional to the square of the number of photons in the field. At present, many proposals use nonlinearities to generate photon-photon interactions. For propagating fields these interactions result in undesirable features such as spectral correlation between the photons. Here, we engineer a discrete network composed of cross-Kerr interaction regions to simulate a self-Kerr medium. The medium has effective long-range interactions implemented in a physically local way. We compute the one-and two-photon S matrices for fields propagating in this medium. From these scattering matrices we show that our proposal leads to a high fidelity photon-photon gate. In the limit where the number of nodes in the network tends to infinity, the medium approximates a perfect self-Kerr interaction in the one-and two-photon regime.

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Section: Introductionmentioning

confidence: 99%

Two-photon self-Kerr nonlinearities for quantum computing and quantum optics

Combes

Brod

2018

Phys. Rev. A

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“…Because EIT features extremely high dispersion and considerable suppression of linear absorption, various nonlinear optical effects based on EIT have been studied and experimentally demonstrated at the photon level [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Recently, four-wave mixing (FWM) based on a double-Λ configuration has attracted much attention because of its potential to enable implementation of a practical QFC device and other promising applications [32][33][34][35][36][37][38][39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of spatial-light-modulation-based four-wave mixing in cold atoms

et al. 2018

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Long-distance quantum optical communications usually require efficient wave-mixing processes to convert the wavelengths of single photons. Many quantum applications based on electromagnetically induced transparency (EIT) have been proposed and demonstrated at the single-photon level, such as quantum memories, all-optical transistors, and cross-phase modulations. However, EIT-based four-wave mixing (FWM) in a resonant double-Λ configuration has a maximum conversion efficiency (CE) of 25% because of absorptive loss due to spontaneous emission. An improved scheme using spatially modulated intensities of two control fields has been theoretically proposed to overcome this conversion limit. In this study, we first demonstrate wavelength conversion from 780 to 795 nm with a 43% CE by using this scheme at an optical density (OD) of 19 in cold 87 Rb atoms. According to the theoretical model, the CE in the proposed scheme can further increase to 96% at an OD of 240 under ideal conditions, thereby attaining an identical CE to that of the previous non resonant double-Λ scheme at half the OD. This spatial-light-modulation-based FWM scheme can achieve a near-unity CE, thus providing an easy method of implementing an efficient quantum wavelength converter for all-optical quantum information processing.

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“…Recently, single-photon transistor has been realized in both cavity EIT 23 and Rydberg EIT systems 24 – 26 . An all-optical π -order phase modulator has also been demonstrated at the photon level 27 – 30 . These EIT-based schemes have shown their potential in quantum information science and technology.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency backward four-wave mixing by quantum interference

Liu

Xiao

Lin

et al. 2017

Sci Rep

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Electromagnetically-induced-transparency-based four-wave mixing (FWM) in a resonant four-level double-Λ system has a maximum conversion efficiency (CE) of 25% due to spontaneous emission. Herein, we demonstrate that spontaneous emission can be considerably suppressed by arranging the applied laser beams in a backward configuration. With the backward double-Λ FWM scheme, we observe a CE of 63% in cold rubidium atoms with an optical depth (OD) of 48. To the best of our knowledge, this is the first observation of a CE exceeding the conversion limit in resonant FWM processes. Furthermore, we present a theoretical model that includes the phase-mismatch effect in the backward double-Λ FWM system. According to the theoretical model, the present scheme can achieve 96% CE using a medium with a large OD of 200 under ideal conditions. Such an efficient frequency conversion scheme has potential applications in optical quantum information technology.

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Optical Quantum Logic at the Ultimate Limit

Cited by 3 publications

References 34 publications

Two-photon self-Kerr nonlinearities for quantum computing and quantum optics

Two-photon self-Kerr nonlinearities for quantum computing and quantum optics

Demonstration of spatial-light-modulation-based four-wave mixing in cold atoms

High-efficiency backward four-wave mixing by quantum interference

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