Implementations of heralded quantum Toffoli and Fredkin gates assisted by waveguide-mediated photon scattering

Du, Fangfang; Fan, Gang; Wu, Yiming

doi:10.1007/s11128-022-03801-5

Cited by 13 publications

(6 citation statements)

References 90 publications

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“…This is the reason why, even today, the intrinsic springs of what, without a doubt, constitutes the most interesting and useful phenomenon in physics, i.e., entanglement, are unknown in all its magnitude. However, even with incomplete knowledge of it, the twenty-first century has become the moment of the birth of the so-called quantum information science 6 , of which quantum computation [7][8][9][10][11] , and quantum communications [12][13][14][15] represent the most promising verticals, both having entanglement as an essential tool for their development. The advances produced in this area intrinsically imply small and important steps, due to the need to avoid a certain number of obstacles grouped in a family of no-go theorems 6 , of which the most conspicuous is without a doubt the no-cloning theorem 16 .…”

Section: Mario Mastrianimentioning

confidence: 99%

Simplified entanglement swapping protocol for the quantum Internet

Mastriani

2023

Sci Rep

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In this study, a simplified version of the entanglement-swapping protocol, commonly used in the deployment of quantum networks, is presented. Quantum repeaters are essential in extending the range of quantum networks, especially when they are implemented through the laying of optical fiber. The simplified version of the entanglement-swapping protocol does not require the use of unitary transforms to finish characterizing the shared Bell state at both ends to be connected, as happens in the traditional version of the protocol, facilitating and reducing costs in quantum repeater implementations. Both a theoretical demonstration and an experimental one on an optical table, based on two revealing experiments, show the excellent performance of the presented protocol.

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Section: Mario Mastrianimentioning

confidence: 99%

Simplified entanglement swapping protocol for the quantum Internet

Mastriani

2023

Sci Rep

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“…The evolution of quantum computing [1] and quantum communication [2][3][4][5][6][7][8] is inseparable from the construction and improvement of the basic framework, where the logical qubit gate is one of the primary modules. [9] By far, plentiful and various logical gates have been presented with diverse systems, such as linear optics, [10][11][12][13][14][15][16] quantum dots (QDs), [17][18][19][20][21] cavity-atom systems, [22][23][24][25][26] cross-Kerr nonlinearity, [27] ion trap, [28] nitrogenvacancy center, [29][30][31] and superconducting circuit. [32] A photon possesses available single-qubit operations, easy, and intuitional measurement, low decoherence, and faithful and efficient transmission of information.…”

Section: Introductionmentioning

confidence: 99%

Refined Quantum Gates for Λ‐Type Atom‐Photon Hybrid Systems

Fan

2023

Adv Quantum Tech

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High‐efficiency quantum information processing is equivalent to the fewest quantum resources and simplest operations by means of logic qubit gates. Based on the reflection geometry of a single photon interacting with a three‐level Λ‐type atom‐cavity system, the authors present some refined protocols for realizing controlled‐not (CNOT), Fredkin, and Toffoli gates on hybrid systems. The first control qubit of gates is encoded on a flying photon, and the remaining qubits are encoded on the atoms in the optical cavity. Moreover, these quantum gates can be extended to the optimal synthesis of multi‐qubit CNOT, Fredkin, and Toffoli gates with optical elements without auxiliary photons or atoms. Further, the simplest single‐qubit operations are applied to the photon only, which make these logic gates experimentally feasible with current technology.

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“…[16][17][18][19][20] It is extensively proven that any quantum computing process can be completed via some elementary single-qubit operations and two-qubit entangled gates, e.g., controlled-NOT (CNOT) gate. [21] Recently, extensive attention has been raised to realize universal quantum logic gates with instinctive systems mainly including linear optics, [22][23][24][25][26] quantum dots, [27][28][29][30][31][32] superconducting circuits, [33] nitrogen vacancy centers [34][35][36][37] waveguide systems, [38][39][40][41] and neutral atoms. [42,43] However, efficiently implementing multi-qubit DOI: 10.1002/qute.202300201 quantum logic gates presents a major obstacle in practical large-scale integration.…”

Section: Introductionmentioning

confidence: 99%

Deterministic Hyperparallel Control Gates with Weak Kerr Effects

Du,

Fan,

Ren

et al. 2023

Adv Quantum Tech

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By harnessing weak cross‐Kerr nonlinearities, it proposes two deterministic hyperparallel quantum control gates, including the hyperparallel controlled‐NOT (hyper‐CNOT) gate and hyperparallel Fredkin (hyper‐Fredkin) gate for photonic systems in the polarization and spatial degrees of freedom (DoFs), which are composed of two procedures for the implementations of the first polarized control (CNOT and Fredkin) gates and the second spatial control (CNOT and Fredkin) ones in turn. Moreover, compared with the two two‐photon CNOT gates (three‐photon Fredkin gates) in one DoF, the hyper‐CNOT (hyper‐Fredkin) gate is provided with more straightforward quantum circuits, lower computational costs of resource overhead (without the assistance of single photons or entangled states), less cross‐Kerr nonlinear interactions between three photons and the coherent states, and reduces the effect caused by photon‐loss noise. The success probabilities of two quantum control gates are approximated unit by performing the corresponding classical feed‐forward operations based on the different measuring outcomes of the X‐homodyne detectors to be aimed at the coherent states, and they are robust against the photon loss as well, which are feasible with the current technology and convenient in practical applications.

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Implementations of heralded quantum Toffoli and Fredkin gates assisted by waveguide-mediated photon scattering

Cited by 13 publications

References 90 publications

Simplified entanglement swapping protocol for the quantum Internet

Simplified entanglement swapping protocol for the quantum Internet

Refined Quantum Gates for Λ‐Type Atom‐Photon Hybrid Systems

Deterministic Hyperparallel Control Gates with Weak Kerr Effects

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