Super-extended nanofiber-guided field for coherent interaction with hot atoms

Finkelstein, Ran; Winer, Gal; Koplovich, David Zeev; Arenfrid, Or; Hoinkes, Thomas; Guendelman, Gabriel; Netser, Moran; Poem, Eilon; Rauschenbeutel, Arno; Dayan, Barak; Firstenberg, Ofer

doi:10.48550/arxiv.2010.08935

Cited by 1 publication

(1 citation statement)

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“…of magnitude reduction in resources after 35 entangling operations, and three orders of magnitude improvement at 50 gates. With the recent developments in interacting atomic ensembles with integrated photonics [70][71][72][73][74][75][76][77], few-photon nonlinearty on chip-scale devices is becoming feasible, making protocols that rely on moderate nonlinearities a promising new platform for photonic quantum information processing. In this section, we provide calculation details for the success probability of a nonlinear Bell measurement (BM).…”

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confidence: 99%

Boosting photonic quantum computation with moderate nonlinearity

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Matekole

Aqua

et al. 2021

Conference on Lasers and Electro-Optics

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Photonic measurement-based quantum computation (MBQC) is a promising route towards faulttolerant universal quantum computing. A central challenge in this effort is the huge overhead in the resources required for the construction of large photonic clusters using probabilistic linear-optics gates. Although strong single-photon nonlinearity ideally enables deterministic construction of such clusters, it is challenging to realise in a scalable way. Here we explore the prospects of using moderate nonlinearity (with conditional phase shifts smaller than π) to boost photonic quantum computing and significantly reduce its resources overhead. The key element in our scheme is a nonlinear router that preferentially directs photonic wavepackets to different output ports depending on their intensity. As a relevant example, we analyze the nonlinearity provided by Rydberg blockade in atomic ensembles, in which the trade-off between the nonlinearity and the accompanying loss is well understood. We present protocols for efficient Bell measurement and GHZ-state preparationboth key elements in the construction of cluster states, as well as for the CNOT gate and quantum factorization. Given the large number of entangling operations involved in fault-tolerant MBQC, the increase in success probability provided by our protocols already at moderate nonlinearities can result in a dramatic reduction in the required resources.

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