Quantum Networks with Deterministic Spin–Photon Interfaces

Borregaard, Johannes; Sørensen, Anders S.; Lodahl, Peter

doi:10.1002/qute.201800091

Cited by 74 publications

(65 citation statements)

References 105 publications

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“…In more recent work, Vinay and Kok show how to improve the runtime using results from complex analysis [46]. However, this method still remains exponential in the number arXiv:1912.07688v1 [quant-ph] 16 Dec 2019 of repeater segments. Here, we provide two algorithms for computing the full distribution of the waiting time and fidelity following the same model as in [45].…”

Section: Introductionmentioning

confidence: 99%

“…← uniform random sample from [0, 1] retry , w retry ← sample_swap(n)13 return t + t retry , w retry 14 end 15 end16 Auxiliary function sample_dist(n, d) :17 if d = 0 then 18 return sample_swap(n − 1) 19 else 20 (t A , w A ) ← sample_dist(n, d − 1) 21 (t B , w B ) ← sample_dist(n, d − 1) 22 t, w ← g D ((t A , w A ), (t B , w B ))// eq. (24) ← uniform random sample from [0, 1] // Success probability: eq.…”

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confidence: 99%

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Efficient Computation of the Waiting Time and Fidelity in Quantum Repeater Chains

Brand

Coopmans

Elkouss

2020

IEEE J. Select. Areas Commun.

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Quantum communication enables a host of applications that cannot be achieved by classical communication means, with provably secure communication as one of the prime examples. The distance that quantum communication schemes can cover via direct communication is fundamentally limited by losses on the communication channel. By means of quantum repeaters, the reach of these schemes can be extended and chains of quantum repeaters could in principle cover arbitrarily long distances. In this work, we provide two efficient algorithms for determining the generation time and fidelity of the first generated entangled pair between the end nodes of a quantum repeater chain. The runtime of the algorithms increases polynomially with the number of segments of the chain, which improves upon the exponential runtime of existing algorithms. Our first algorithm is probabilistic and can analyze refined versions of repeater chain protocols which include intermediate entanglement distillation. Our second algorithm computes the waiting time distribution up to a pre-specified truncation time, has faster runtime than the first one and is moreover exact up to machine precision. Using our proof-of-principle implementation, we are able to analyze repeater chains of thousands of segments for some parameter regimes. The algorithms thus serve as useful tools for the analysis of large quantum repeater chain protocols and topologies of the future quantum internet.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Efficient Computation of the Waiting Time and Fidelity in Quantum Repeater Chains

Brand

Coopmans

Elkouss

2020

IEEE J. Select. Areas Commun.

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“…Integrated quantum emitters can provide not only photonic qubits but also spin qubits. Therefore, incorporating quantum-specific components, such as quantum memories and quantum gates, as well as coherent nonlinear optical elements based on stationary qubits, enable a wider range of photonic quantum information processing schemes [153] [ Table 2] and new opportunities for exploiting quantum optics. For example, solid-state quantum emitters with a ground-state spin can mediate photon-photon interactions and store the information for a long time [154].…”

Section: Spin-photon Quantum Interfacementioning

confidence: 99%

Hybrid integration methods for on-chip quantum photonics

Kim

Aghaeimeibodi

Carolan

et al. 2020

Optica

219

181

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The goal of integrated quantum photonics is to combine components for the generation, manipulation, and detection of non-classical light in a phase stable and efficient platform. Solid-state quantum emitters have recently reached outstanding performance as single photon sources. In parallel, photonic integrated circuits have been advanced to the point that thousands of components can be controlled on a chip with high efficiency and phase stability. Consequently, researchers are now beginning to combine these leading quantum emitters and photonic integrated circuit platforms to realize the best properties of each technology. In this article, we review recent advances in integrated quantum photonics based on such hybrid systems. Although hybrid integration solves many limitations of individual platforms, it also introduces new challenges that arise from interfacing different materials. We review various issues in solid-state quantum emitters and photonic integrated circuits, the hybrid integration techniques that bridge these two systems, and methods for chip-based manipulation of photons and emitters. Finally, we discuss the remaining challenges and future prospects of on-chip quantum photonics with integrated quantum emitters. PHOTONIC INTEGRATED CIRCUIETS FOR QUANTUM PHOTONICSPICs provide a compact, phase stable, and high-bandwidth platform to transmit, manipulate, and detect light on-chip. By leveraging advances in semiconductor manufacturing for classical communication, PICs have been demonstrated with over a thousand active components in a few square mm [50]. Now, with many foundries offering multi-26. I. Aharonovich, D. Englund, and M. Toth, "Solid-state single-photon emitters," Nat. Photonics 10, 631 (2016) , "Neardeterministic activation of room-temperature quantum emitters in hexagonal boron nitride," Optica 5, 1128-1134 (2018)

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“…Electrically controlled quantum devices can be envisioned for the detection of spin signals and single-photon excitation [22][23][24][25], however, integration of electrically and optically controlled devices appear at an early stage.SiC and other materials have been proposed as a platform for spin-based photonic quantum technologies. The light-matter interface relating quantum light states and the quantum emitter internal states (electron spin) can be used to constitute quantum circuits and networks [26], where quantum entanglement distribution and storage is performed [27]. Solid-state emitters can perform such interfacing role in a scalable and in a compact way due to their atom-and ion-like properties.…”

mentioning

confidence: 99%

“…SiC and other materials have been proposed as a platform for spin-based photonic quantum technologies. The light-matter interface relating quantum light states and the quantum emitter internal states (electron spin) can be used to constitute quantum circuits and networks [26], where quantum entanglement distribution and storage is performed [27]. Solid-state emitters can perform such interfacing role in a scalable and in a compact way due to their atom-and ion-like properties.…”

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confidence: 99%

Silicon carbide color centers for quantum applications

2020

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Silicon carbide has recently surged as an alternative material for scalable and integrated quantum photonics, as it is a host for naturally occurring color centers within its bandgap, emitting from the UV to the IR even at telecom wavelength. Some of these color centers have been proved to be characterized by quantum properties associated with their single-photon emission and their coherent spin state control, which make them ideal for quantum technology, such as quantum communication, computation, quantum sensing, metrology and can constitute the elements of future quantum networks. Due to its outstanding electrical, mechanical, and optical properties which extend to optical nonlinear properties, silicon carbide can also supply a more amenable platform for photonics devices with respect to other wide bandgap semiconductors, being already an unsurpassed material for high power microelectronics. In this review, we will summarize the current findings on this material color centers quantum properties such as quantum emission via optical and electrical excitation, optical spin polarization and coherent spin control and manipulation. Their fabrication methods are also summarized, showing the need for on-demand and nanometric control of the color centers fabrication location in the material. Their current applications in single-photon sources, quantum sensing of strain, magnetic and electric fields, spin-photon interface are also described. Finally, the efforts in the integration of these color centers in photonics devices and their fabrication challenges are described.proved to host these types of color centers, we can now determine that the material has approached the quality needed for quantum applications development.The first bulk material studied for applications in quantum technology is diamond. It was possible to isolate single color centers and determine their role for application in quantum technologies. As an example, the nitrogen-vacancy (NV) center [10], hosted by the diamond matrix, has become the leading color center in applications such as quantum sensing [11], which is a more achievable application on the road map towards quantum networks. Further, other color centers such as the Germanium vacancy (GeV) [12] and the siliconvacancy (SiV) [13] in diamond proved to have an enormous potential for quantum optical spin-photon interface due to their narrow bandwidth emission [14]. The wide bandgap of the diamond, together with its weak spinorbit coupling and diluted nuclear-spin bath, gives to diamond color centers a remarkable spin coherence, and isotope engineering can enhance it further, due to the possibility of growing highly pure samples [15]. SiC also enjoys most of these properties, and benefits from mature production protocols on a large scale which are available for silicon, excellent nanofabrication quality [16], and capability of ion implantation without the side effects typical of the diamond, such as graphitization during irradiation [17]. However, diamond has some limitations in this respect in...

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Quantum Networks with Deterministic Spin–Photon Interfaces

Cited by 74 publications

References 105 publications

Efficient Computation of the Waiting Time and Fidelity in Quantum Repeater Chains

Efficient Computation of the Waiting Time and Fidelity in Quantum Repeater Chains

Hybrid integration methods for on-chip quantum photonics

Silicon carbide color centers for quantum applications

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