An integrated quantum repeater at telecom wavelength with single atoms in optical fiber cavities

Uphoff, Manuel; Brekenfeld, Manuel; Rempe, Gerhard; Ritter, Stephan

doi:10.1007/s00340-015-6299-2

Cited by 54 publications

(30 citation statements)

References 55 publications

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“…The only issue here is that most of the atomic transitions of typical cavity QED atoms, which couple resonantly to the single-mode radiation field, are not at telecom wavelength and therefore the field state is not suitable for long-distance transmission over optical fibers due to high losses. There are two possible approaches: realizing cascade transitions [46,47] or using wavelength conversion [48]. These experiments are subject to the generation or conversion of single photons.…”

Section: A Experimental Considerationsmentioning

confidence: 99%

Hybrid quantum repeater based on resonant qubit-field interactions

Bernád

2017

Phys. Rev. A

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We propose a hybrid quantum repeater based on ancillary coherent field states and material qubits coupled to optical cavities. For this purpose, resonant qubit-field interactions and postselective field measurements are determined which are capable of realizing all necessary two-qubit operations for the actuation of the quantum repeater. We explore both theoretical and experimental possibilities of generating near-maximally-entangled qubit pairs (F > 0.999) over long distances. It is shown that our scheme displays moderately low repeater rates, between 5 × 10 −4 and 23 pairs per second, over distances up to 900 km, and it relies completely on current technology of cavity quantum electrodynamics.

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Section: A Experimental Considerationsmentioning

confidence: 99%

Hybrid quantum repeater based on resonant qubit-field interactions

Bernád

2017

Phys. Rev. A

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“…Proof. As the U CQT transforms of the {E mk } basis estimations (99) are determined via C B (113), the Q transformed bases are partitioned to M partitions via the U P unitary operation, as follows.…”

Section: Basis Partitioning Unitarymentioning

confidence: 99%

Optimizing High-Efficiency Quantum Memory with Quantum Machine Learning for Near-Term Quantum Devices

Gyöngyösi

Imre

2020

Sci Rep

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Quantum memories are a fundamental of any global-scale quantum Internet, high-performance quantum networking and near-term quantum computers. A main problem of quantum memories is the low retrieval efficiency of the quantum systems from the quantum registers of the quantum memory. Here, we define a novel quantum memory called high-retrieval-efficiency (HRE) quantum memory for near-term quantum devices. An HRE quantum memory unit integrates local unitary operations on its hardware level for the optimization of the readout procedure and utilizes the advanced techniques of quantum machine learning. We define the integrated unitary operations of an HRE quantum memory, prove the learning procedure, and evaluate the achievable output signal-to-noise ratio values. We prove that the local unitaries of an HRE quantum memory achieve the optimization of the readout procedure in an unsupervised manner without the use of any labeled data or training sequences. We show that the readout procedure of an HRE quantum memory is realized in a completely blind manner without any information about the input quantum system or about the unknown quantum operation of the quantum register. We evaluate the retrieval efficiency of an HRE quantum memory and the output SNR (signalto-noise ratio). The results are particularly convenient for gate-model quantum computers and the near-term quantum devices of the quantum Internet.1. We define a novel quantum memory called high-retrieval-efficiency (HRE) quantum memory.2. An HRE quantum memory unit integrates local unitary operations on its hardware level for the optimization of the readout procedure and utilizes the advanced techniques of quantum machine learning.3. We define the integrated unitary operations of an HRE quantum memory, prove the learning procedure, and evaluate the achievable output signal-to-noise ratio values. We prove that local unitaries of an HRE quantum memory achieve the optimization of the readout procedure in an unsupervised manner without the use of any labeled data or training sequences.4. We evaluate the retrieval efficiency of an HRE quantum memory and the output SNR.5. The proposed results are convenient for gate-model quantum computers and near-term quantum devices.This paper is organized as follows. Section 2 defines the system model and the problem statement. Section 3 evaluates the integrated local unitary operations of an HRE quantum memory. Section 4 proposes the retrieval efficiency in terms of the achievable output SNR values. Finally, Section 5 concludes the results. Supplemental material is included in the Appendix.

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“…It is recently approved that distributing entanglement and entangled states to long distances is possible by using quantum repeater protocol [1][2][3][4][5]. A scheme for quantum repeaters related to pure two-mode squeezed states over long distances has been presented in [6].…”

Section: Introductionmentioning

confidence: 99%

Quantum repeater protocol using an arrangement of QED–optomechanical hybrid systems

Ghasemi

Tavassoly

2019

J. Opt. Soc. Am. B

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In this paper we consider the quantum repeater protocol for distributing the entanglement to two distant three-level atoms. In this protocol, we insert six atoms between two target atoms such that the eight considered atoms are labeled by 1, 2, • • • 8, while only each two adjacent atoms (i, i + 1) with i = 1, 3, 5, 7 are entangled. Initially, the separable atomic pair states (1,4) and (5,8) become entangled by performing interaction between atoms (2,3) and (6,7) in two optomechanical cavities, respectively. Then, via performing appropriate interaction between atoms (4,5) in an optical cavity quantum electrodynamics (QED) approach, the target atoms (1,8) are finally become entangled. Throughout this investigation, the effects of mechanical frequency and optomechanical coupling strength to the field modes on the produced entanglement and the related success probability are evaluated. It is shown that, the time period of produced entanglement can be developed by increasing the mechanical frequency. Also, maximum of success probability of atoms (1,8) is increased by decreasing the optomechanical coupling strength to the field modes in most cases.

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An integrated quantum repeater at telecom wavelength with single atoms in optical fiber cavities

Cited by 54 publications

References 55 publications

Hybrid quantum repeater based on resonant qubit-field interactions

Hybrid quantum repeater based on resonant qubit-field interactions

Optimizing High-Efficiency Quantum Memory with Quantum Machine Learning for Near-Term Quantum Devices

Quantum repeater protocol using an arrangement of QED–optomechanical hybrid systems

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