Integrated photonic platform for quantum information with continuous variables

Lenzini, Francesco; Janoušek, Jiří; Thearle, Oliver; Villa, Matteo; Haylock, Ben; Kasture, Sachin; Liang, Chao; Phan, Hoang‐Phuong; Dao, Dzung Viet; Yonezawa, Hidehiro; Lam, Ping Koy; Huntington, Elanor H.; Lobino, Mirko

doi:10.1126/sciadv.aat9331

Cited by 126 publications

(101 citation statements)

References 43 publications

(79 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Integrated nonlinear waveguides offer a few advantages over bulk nonlinear crystals, since they achieve a stronger nonlinear interaction by increasing the field confinement over longer lengths and can be interfaced more easily with fibre networks [14]. Moreover, they can be integrated along with other linear and nonlinear elements to generate and manipulate different quantum states of light [15][16][17][18]. However, the nonlinear properties of integrated waveguides critically depend upon their quality and any fabrication imperfection can degrade the final performance.…”

Section: Introductionmentioning

confidence: 99%

Fabrication limits of waveguides in nonlinear crystals and their impact on quantum optics applications

et al. 2019

View full text Add to dashboard Cite

Waveguides in nonlinear materials are a key component for photon pair sources and offer promising solutions to interface quantum memories through frequency conversion. To bring these technologies closer to every-day life, it is still necessary to guarantee a reliable and efficient fabrication of these devices. Therefore, a thorough understanding of the technological limitations of nonlinear waveguiding devices is paramount. In this paper, we study the link between fabrication errors of waveguides in nonlinear crystals and the final performance of such devices. In particular, we first derive a mathematical expression to qualitatively assess the technological limitations of any nonlinear waveguide. We apply this tool to study the impact of fabrication imperfections on the phasematching properties of different quantum processes realized in titanium-diffused lithium niobate waveguides. Finally, we analyse the effect of waveguide imperfections on quantum state generation and manipulation for few selected cases. Studying the impact of fabrication errors on the waveguide widths, we find that the presence of correlated noise plays a major role in the degradation of the phasematching and we suggest different possible strategies to reduce the impact of fabrication imperfections.

show abstract

Section: Introductionmentioning

confidence: 99%

Fabrication limits of waveguides in nonlinear crystals and their impact on quantum optics applications

et al. 2019

View full text Add to dashboard Cite

show abstract

“…For scalable and programmable quantum computing, integrated photonic chips have been developed to miniaturize and scale up photonic circuits both in qubit 90,91 and CV 89,92 quantum computing [ Fig. 6(b)].…”

Section: A Typical Architecture For Photonic Quantum Computingmentioning

confidence: 99%

Toward large-scale fault-tolerant universal photonic quantum computing

2019

View full text Add to dashboard Cite

Photonic quantum computing is one of the leading approaches to universal quantum computation. However, large-scale implementation of photonic quantum computing has been hindered by its intrinsic difficulties, such as probabilistic entangling gates for photonic qubits and lack of scalable ways to build photonic circuits. Here we discuss how to overcome these limitations by taking advantage of two key ideas which have recently emerged. One is a hybrid qubit-continuous variable approach for realizing a deterministic universal gate set for photonic qubits. The other is time-domain multiplexing technique to perform arbitrarily large-scale quantum computing without changing the configuration of photonic circuits. These ideas together will enable scalable implementation of universal photonic quantum computers in which hardware-efficient error correcting codes can be incorporated. Furthermore, all-optical implementation of such systems can increase the operational bandwidth beyond THz in principle, utimately enabling large-scale fault-tolerant universal quantum computers with ultra-high operation frequency. arXiv:1904.07390v1 [quant-ph]

show abstract

“…One reason is that a squeezer generates a squeezed vacuum state whose uncertainty in one of two quadratures is squeezed less than that of a vacuum state. A squeezed vacuum state can be used as an ancilla in a wide range of CV protocols [2,3] to improve the sensitivity of metrology or capacity of quantum communication, and to generate quantum entanglement. Another reason of importance is that a squeezer realizes a squeezing operation which is built into almost all CV quantum state manipulation protocols.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of a coherent feedback squeezer

et al. 2020

Self Cite

View full text Add to dashboard Cite

We investigate a coherent feedback squeezer that uses quantum coherent feedback (measurementfree) control. Our squeezer is simple, easy to implement, robust to the gain fluctuation, and broadband compared to the existing squeezers because of the negative coherent feedback configuration. We conduct a feasibility study that looks at the stability conditions for a feedback system to optimize the designs of real optical devices. The feasibility study gives fabrication tolerance necessary for designing and realizing the actual device. Our formalism for the stability analysis is not limited to optical systems but can be applied to the other bosonic systems.

show abstract

Integrated photonic platform for quantum information with continuous variables

Abstract: An integrated optical chip is used for generating, manipulating, and detecting squeezed vacuum and two-mode entanglement.

Cited by 126 publications

References 43 publications

Fabrication limits of waveguides in nonlinear crystals and their impact on quantum optics applications

Fabrication limits of waveguides in nonlinear crystals and their impact on quantum optics applications

Toward large-scale fault-tolerant universal photonic quantum computing

Feasibility study of a coherent feedback squeezer

Contact Info

Product

Resources

About