Continuous-Variable Entanglement Swapping

Marshall, Kevin; Weedbrook, Christian

doi:10.3390/e17053152

Cited by 8 publications

(4 citation statements)

References 38 publications

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“…where the subscripts (1,2) and (3,4) denote two particles in the two states, respectively. The generalized ddimensional Bell states are given by [12,20]…”

Section: Entanglement Swappingmentioning

confidence: 99%

“…Entanglement is the core resource of quantum information processing, and plays an increasingly prominent role in quantum information science. As an important means to produce entanglement, entanglement swapping has attracted extensive attention since it was proposed by Żukowski et al [1][2][3]. Entanglement swapping has become one of the core technologies in the construction of quantum Internet, and provides ideas for solving many quantum information processing tasks such as quantum communication and quantum cryptography [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Entanglement swapping theory and beyond

Ji¹,

Fan²,

Zhang³

2020

Preprint

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We consider entanglement swapping schemes for maximally entangled states, each of which is realized by Bell measurements. The entangled states considered include bipartite maximally entangled states, d-level Bell states and Greenberger-Horne-Zeilinger states. We also consider the entanglement swapping chains proposed by Hardy et al. [Phys. Rev. A. 62(5) 052315] for maximally entangled states. Applications of the proposed entanglement swapping schemes in quantum cryptography are described.

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“…where the subscripts (1,2) and (3,4) denote two particles in the two states, respectively. The generalized ddimensional Bell states are given by [12,20]…”

Section: Entanglement Swappingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Entanglement swapping theory and beyond

Ji¹,

Fan²,

Zhang³

2020

Preprint

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“…Thus, quantum repeaters are key elements in the framework of a quantum network and they have been considered in various entanglement distribution schemes. The phenomenon of entanglement swapping for continuous variables is discussed in [16]. A quantum key distribution scheme involving entanglement swapping is proposed in [17], while a quantum conferencing scheme for secure communication between several users is developed in [18].…”

Section: General Contextmentioning

confidence: 99%

EntangleNet: Theoretical Reestablishment of Entanglement in Quantum Networks †

Mina

Popescu

2018

Applied Sciences

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In the practical context of quantum networks, the most reliable method of transmitting quantum information is via teleportation because quantum states are highly sensitive. However, teleportation consumes a shared maximally entangled state. Two parties Alice and Bob located at separate nodes that wish to reestablish their shared entanglement will not send entangled qubits directly to achieve this goal, but rather employ a more efficient mechanism that ensures minimal time resources. In this paper, we present a quantum routing scheme that exploits entanglement swapping to reestablish consumed entanglement. It improves and generalizes previous work on the subject and reduces the entanglement distribution time by a factor of 4 k in an arbitrary scale quantum network, where N = 4 k - 1 is a required number of quantum nodes located between source and destination. In addition, k is the greatest positive integer considered by Alice or Bob, such that afterwards they choose N quantum switches.

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“…Furthermore, we introduce displacement (coherence) as a parameter too, which can also be chosen arbitrarily. Coupled with all the parameters, our covariance matrix is the most general one attempted till date and apart from its immediate application in QKD, it is expected to be of immense interest in other non-Gaussian information processing tasks such as quantum teleportation, entanglement swapping [41,42], quantum internet [43] etc .…”

Section: Introductionmentioning

confidence: 99%

Non-Gaussian operations in measurement device independent quantum key distribution

Singh,

Bose

2021

Preprint

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Non-Gaussian operations in continous variable (CV) quantum key distribution (QKD) have been limited to photon subtraction on squeezed vacuum states only. This is mainly due to the ease of calculating the covariance matrix representation of such states. In this paper we study the effects of general non-Gaussian operations corresponding to photon addition, catalysis and subtraction on squeezed coherent states on CV measurement device independent (MDI) QKD. We find that non-Gaussianity coupled with coherence can yield significantly longer transmission distances than without. Particularly we observe that zero photon catalysis on two mode squeezed coherent state (TMSC) is an optimial choice for CV MDI QKD, while single photon subtraction is also a good candidate; both of them offering nearly 70 km of transmission distances. We also derive a single generalized covariance matrix for the aforementioned states which will be useful in several other aspects of CV quantum information processing.

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Continuous-Variable Entanglement Swapping

Cited by 8 publications

References 38 publications

Entanglement swapping theory and beyond

Entanglement swapping theory and beyond

EntangleNet: Theoretical Reestablishment of Entanglement in Quantum Networks †

Non-Gaussian operations in measurement device independent quantum key distribution

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