Squeezed light from a nanophotonic molecule

Zhang, Y.; Menotti, M.; Tan, Kuan Yen; Vaidya, Varun; Mahler, Dylan H.; Helt, L. G.; Zatti, Luca; Liscidini, Marco; Morrison, Blair; Vernon, Z.

doi:10.1038/s41467-021-22540-2

Cited by 90 publications

(47 citation statements)

References 30 publications

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“…Furthermore, we show that the advantage of squeezed-coherent encodings is robust with respect to the addition of channel losses, contrarily to Fockstate encodings, identifying a regime where the use of a source producing up to two-photon Fock states is sub-optimal with respect to a much simpler squeezedcoherent source with reasonable squeezing values, e.g., ∼ 5.8dB at energy E ∼ 2 vs the 8-15dB attainable at the state of the art [30,31].…”

Section: Lossesmentioning

confidence: 95%

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Squeezing-enhanced communication without a phase reference

Fanizza

Rosati

Skotiniotis

et al. 2021

Quantum

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We study the problem of transmitting classical information using quantum Gaussian states on a family of phase-noise channels with a finite decoherence time, such that the phase-reference is lost after m consecutive uses of the transmission line. This problem is relevant for long-distance communication in free space and optical fiber, where phase noise is typically considered as a limiting factor. The Holevo capacity of these channels is always attained with photon-number encodings, challenging with current technology. Hence for coherent-state encodings the optimal rate depends only on the total-energy distribution and we provide upper and lower bounds for all m, the latter attainable at low energies with on/off modulation and photodetection. We generalize this lower bound to squeezed-coherent encodings, exhibiting for the first time to our knowledge an unconditional advantage with respect to any coherent encoding for m=1 and a considerable advantage with respect to its direct coherent counterpart for m>1. This advantage is robust with respect to moderate attenuation, and persists in a regime where Fock encodings with up to two-photon states are also suboptimal. Finally, we show that the use of part of the energy to establish a reference frame is sub-optimal even at large energies. Our results represent a key departure from the case of phase-covariant Gaussian channels and constitute a proof-of-principle of the advantages of using non-classical, squeezed light in a motivated communication setting.

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Section: Lossesmentioning

confidence: 95%

“…The violet solid line is the upper bound on the coherent state rate Eq. 45 chip production [31](up to 8dB).…”

Section: Comparison With Fock and Ternary Encodingsmentioning

confidence: 99%

Squeezing-enhanced communication without a phase reference

Fanizza

Rosati

Skotiniotis

et al. 2021

Quantum

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“…[149] used a silicon chip to produce squeezed states by four-wave mixing and perform Gaussian boson sampling in a fixed configuration. Silicon nitride ring resonators have also been demonstrated to generate non-degenerate two-mode squeezed states [150] and degenerate single-mode squeezed states [151][152][153] by four-wave mixing or self-phase modulation. One of such sources were later integrated into a programmable photonic chip based on silicon nitride, demonstrating Gaussian boson sampling and its related algorithms [8].…”

Section: Scaling Up With Integrated Opticsmentioning

confidence: 99%

Building a large-scale quantum computer with continuous-variable optical technologies

Fukui,

Takeda

2021

Preprint

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Realizing a large-scale quantum computer requires hardware platforms that can simultaneously achieve universality, scalability, and fault tolerance. As a viable pathway to meeting these requirements, quantum computation based on continuous-variable optical systems has recently gained more attention due to its unique advantages and approaches. This review introduces several topics of recent experimental and theoretical progress in the optical continuous-variable quantum computation that we believe are promising. In particular, we focus on scaling-up technologies enabled by time multiplexing, bandwidth broadening, and integrated optics, as well as hardware-efficient and robust bosonic quantum error correction schemes.

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“…In particular, as the rapid development of nanofabrication technology, miniaturized ring resonators have matured to be an ideal platform for the study of nonlinear optics [6]. Mode manipulation of such micro-cavities, especially on-demand spectrum engineering, plays a crucial role in a vast of nonlinear applications, including optical signal processing [7,8], non-classical light generation [9][10][11][12], optical frequency comb generation [13][14][15][16][17][18][19].…”

mentioning

confidence: 99%

“…Notably, mode manipulations of microring resonators are routinely realized by Hermitian mode coupling with either high-order spatial modes [13,14,18] or auxiliary resonators [9,10,20,21]. This is due to the fact that nontouching scheme based on mode coupling is an excellent option to avoid scarifying the quality factor of microring resonators, which is of vital importance in most nonlinear applications.…”

mentioning

confidence: 99%

Non-Hermitian singularities induced single-mode depletion and soliton formation in microresonators

Zhang,

Chen,

Yang

et al. 2021

Preprint

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On-chip manipulation of single resonance over broad background comb spectra of microring resonators is indispensable, ranging from tailoring laser emission, optical signal processing to nonclassical light generation, yet challenging without scarifying the quality factor or inducing additional dispersive effects. Here, we propose an experimentally feasible platform to realize on-chip selective depletion of single resonance in microring with decoupled dispersion and dissipation, which are usually entangled by Kramer-Kroning relation. Thanks to the existence of non-Hermitian singularity, unsplit but significantly increased dissipation of the selected resonance is achieved due to the simultaneous collapse of eigenvalues and eigenvectors, fitting elegantly the requirement of pure mode depletion. With delicate yet experimentally feasible parameters, we show explicit evidence of modulation instability as well as deterministic single soliton generation in microresonators induced by depletion in normal and anomalous dispersion regime, respectively. Our findings connect non-Hermitian singularities to wide range of applications associated with selective single mode manipulation in microwave photonics, quantum optics, ultrafast optics and beyond.

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Squeezed light from a nanophotonic molecule

Cited by 90 publications

References 30 publications

Squeezing-enhanced communication without a phase reference

Squeezing-enhanced communication without a phase reference

Building a large-scale quantum computer with continuous-variable optical technologies

Non-Hermitian singularities induced single-mode depletion and soliton formation in microresonators

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