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doi:10.1109/jstqe.2015.2456855

Cited by 31 publications

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“…Our goal in this paper is to identify technical improvements necessary in individual TSTI modules for viable quantum networking for which single modules per repeater node suffice. The elements of network operation described above categorize the simple architectures we consider in this paper into the second generation of quantum repeaters without encoding [19,20,22]. In the following section 2.1 we describe the modular operations necessary for key generation and then in section 2.2 we describe the simple repeater architectures we consider in the rest of the paper.…”

Section: Architectures For Quantum Repeatersmentioning

confidence: 99%

“…However, the attenuation in the optical fiber poses a significant challenge for the long-distance transmission of single photons [9,10]. Quantum repeaters [11,12] solve the attenuation problem by dividing the total communication distance into shorter channels connected by intermediate nodes, where the photon loss is detected [13][14][15][16][17][18] and can be corrected by using an active mechanism [19][20][21][22][23][24][25][26]. In addition to photon loss errors, operation errors accumulate over the quantum channel that degrades the quality of the transmitted entangled state.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to photon loss errors, operation errors accumulate over the quantum channel that degrades the quality of the transmitted entangled state. Depending on the methods used to overcome photon loss and operation errors, quantum repeaters make different demands on the quantum hardware for their construction [19,20,22].…”

Section: Introductionmentioning

confidence: 99%

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Quantum repeaters based on two species trapped ions

et al. 2019

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We examine the viability of quantum repeaters based on two-species trapped ion modules for longdistance quantum key distribution. Repeater nodes comprised of ion-trap modules of co-trapped ions of distinct species are considered. The species used for communication qubits has excellent optical properties while the other longer lived species serves as a memory qubit in the modules. Each module interacts with the network only via single photons emitted by the communication ions. Coherent Coulomb interaction between ions is utilized to transfer quantum information between the communication and memory ions and to achieve entanglement swapping between two memory ions. We describe simple modular quantum repeater architectures realizable with the ion-trap modules and numerically study the dependence of the quantum key distribution rate on various experimental parameters, including coupling efficiency, gate infidelity, operation time and length of the elementary links. Our analysis suggests crucial improvements necessary in a physical implementation for cotrapped two-species ions to be a competitive platform in long-distance quantum communication. efficiently entangled to photons and a different longer lived species of ions ( 9 Be + or 171 Yb + ) that can be utilized as a quantum memory qubit and for local processing. A high-fidelity transfer of quantum information between the two species of ions can also be achieved [29]. Furthermore, due to transition-frequency difference the optical operations with the communication ions do not disturb the quantum memory ions even though they are only a few microns away. Despite such experimental advances an analysis of quantum key generation rates, among the most promising uses of a quantum network, using TSTI for quantum repeaters is lacking.We describe in this paper a quantum repeater architecture based on modules of two species of trapped ions. We study the viability of using these modules as building blocks for the construction of long-distance quantum repeaters by analyzing quantum key distribution rates. The architecture can potentially work for any pair of communication and memory ions. For the numerical results later in the paper, however, we consider the advances made with the 171 Yb + -138 Ba + pair described in [41] with the following features: excellent isolation between 171 Yb + quantum memory ions and 138 Ba + communication ions was achieved and a state transfer between them was demonstrated; Ba + coherence times of 100 μs in unstabilized magnetic fields and a coherence time of 4 ms with stabilized magnetic fields were measured; same-species two-qubit gates between 171 Yb + ions with 98% fidelity and cross-species two-qubit gates between a 171 Yb + ion and 138 Ba + ion with 75% fidelty in 200 μs were demonstrated; light collection efficiency from the 138 Ba + ion of about 10% and fiber coupling efficiency of 17% in the absence of a cavity were reported. Our analysis suggests crucial improvements in the performance parameters that can maximize key generation rates. We foc...

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Section: Architectures For Quantum Repeatersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantum repeaters based on two species trapped ions

et al. 2019

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Electromagnetic Wave Tunneling from Metamaterial Antiparallel Dipole Resonance

Han

Ohno

Minamide

2021

Advanced Photonics Research

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Metamaterial resonances have demonstrated outstanding abilities to control electromagnetic waves, which brings promises to directly use them to create unique channels for electromagnetic wave tunneling through barriers. Herein, an electromagnetic wave tunneling effect is realized by an antiparallel dipole resonance in a multilayer metamaterial composed of a pair of metallic unsplit ring resonators (USRRs) with a split ring resonator (SRR) sandwiched between them. The sandwiched SRR is known to serve as a barrier to the incident electromagnetic wave at its fundamental resonant frequency. However, with assistance of a “bypass bridge” formed by the magnetic response from the antiparallel dipole resonance excited on the pair of USRRs, the electromagnetic wave tunnels through the barrier. Through field distributions and harmonic model analysis, the universal conditions for the tunneling are found to happen in such a multilayer configuration. As long as the antiparallel dipole resonance is excited on the pair of USRRs, and thus the bypass bridge is formed, no matter what other barrier is sandwiched, the tunneling effect still occurs. Herein, the applications are for electrical wire connections in integrated circuits regarding electromagnetic compatibility, optical cloaking devices, as well as designs for both optical amplitude and phase modulators.

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Introduction

Francis-Jones¹

2017

Springer Theses

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Cited by 31 publications

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Quantum repeaters based on two species trapped ions

Quantum repeaters based on two species trapped ions

Electromagnetic Wave Tunneling from Metamaterial Antiparallel Dipole Resonance

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