Side-Channel-Free Quantum Key Distribution

Braunstein, Samuel L.; Pirandola, Stefano

doi:10.1103/physrevlett.108.130502

Cited by 616 publications

(482 citation statements)

References 26 publications

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“…Recently, Lo, Curty, and Qi proposed an MDI-QKD scheme [36] that is able to essentially avoid random bit assignments, hence going beyond the 50% efficiency limit [20]. By relying on entanglement swapping techniques [37] and reverse EPR schemes [38], the MDI-QKD scheme [20] (see also [39]) can achieve similar performance to traditional QKD systems, while shielding out detection loopholes.…”

Section: Introductionmentioning

confidence: 99%

Alternative schemes for measurement-device-independent quantum key distribution

2012

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Practical schemes for measurement-device-independent quantum key distribution using phase and path or time encoding are presented. In addition to immunity to existing loopholes in detection systems, our setup employs simple encoding and decoding modules without relying on polarization maintenance or optical switches. Moreover, by employing a modified sifting technique to handle the dead-time limitations in single-photon detectors, our scheme can be run with only two singlephoton detectors. With a phase-postselection technique, a decoy-state variant of our scheme is also proposed, whose key generation rate scales linearly with the channel transmittance. *

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Section: Introductionmentioning

confidence: 99%

Alternative schemes for measurement-device-independent quantum key distribution

2012

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“…A theoretical protocol developed for quantum sensor networks can be found (Nagy et al, 2010). Practical implementations with theoretical security proofs have been presented in (Braunstein and Pirandola, 2012;Lo et al, 2012). The protocol presented here will use entanglement swapping, but exhibits basic different features.…”

Section: Introductionmentioning

confidence: 99%

Carving Secret Messages out of Public Information

Nagy¹,

Nagy²,

Akl³

2015

Journal of Computer Science

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This study shows that secret information can be shared or passed from a sender to a receiver even if not encoded in a secret message. In the protocol designed in this study, no parts of the original secret information ever travel via communication channels between the source and the destination, no encoding/decoding key is ever used. The two communicating partners, Alice and Bob, are endowed with coherent qubits that can be read and set and keep their quantum values over time. Additionally, there exists a central authority that is capable of identifying Alice and Bob to share with each half of entangled qubit pairs. The central authority also performs entanglement swapping. Our protocol relies on the assumption that public information can be protected, an assumption present in all cryptographic protocols. Also any classical communication channel need not be authenticated. As each piece of secret information has a distinct public encoding, the protocol is equivalent to a one-time pad protocol.

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“…Examples of such schemes are distribution of entangled photon pairs to end users, where local measurements are performed, 9 or conversely, where photons are sent by two users to be projected into a Bell state by an intermediate quantum node. [10][11][12] Photonic quantum repeaters 13 and relays 8 use both of these effects to teleport entangled or single qubits, respectively, in a manner that can be chained to create a fully quantum network for which theoretically proven quantum security can be preserved.…”

Section: Introductionmentioning

confidence: 99%

An entangled-LED-driven quantum relay over 1 km

et al. 2016

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Quantum cryptography allows confidential information to be communicated between two parties, with secrecy guaranteed by the laws of nature alone. However, upholding guaranteed secrecy over networks poses a further challenge, as classical receive-andresend routing nodes can only be used conditional of trust by the communicating parties, which arguably diminishes the value of the underlying quantum cryptography. Quantum relays offer a potential solution by teleporting qubits from a sender to a receiver, without demanding additional trust from end users. Here we demonstrate the operation of a quantum relay over 1 km of optical fibre, which teleports a sequence of photonic quantum bits to a receiver by utilising entangled photons emitted by a semiconductor light-emitting diode. The average relay fidelity of the link is 0.90 ± 0.03, exceeding the classical bound of 0.75 for the set of states used, and sufficiently high to allow error correction. The fundamentally low multiphoton emission statistics and the integration potential of the source present an appealing platform for future quantum networks. INTRODUCTIONQuantum key distribution 1,2 systems based on weak-coherent optical pulses have been reported that allow unique cryptographic keys to be shared between directly connected users on point-to-point 3-5 or point-to-multipoint links 6 . To establish fully quantum multipartite networks, that avoid trusting intermediate parties, 7 it is necessary to route quantum signals through a backbone of quantum nodes. 8 This can be achieved by leveraging quantum entanglement to set-up non-local correlations between measurements by end users. Examples of such schemes are distribution of entangled photon pairs to end users, where local measurements are performed, 9 or conversely, where photons are sent by two users to be projected into a Bell state by an intermediate quantum node. 10-12 Photonic quantum repeaters 13 and relays 8 use both of these effects to teleport entangled or single qubits, respectively, in a manner that can be chained to create a fully quantum network for which theoretically proven quantum security can be preserved.Here we report operation of a quantum relay over 1 km of optical fibre using entangled photons generated by a lightemitting diode to teleport photonic qubits encoded on weak coherent pulses emitted by a laser. Compared with previously reported quantum relays 14 and photonic teleportation over significant distances, 15,16 our system is directly electrically driven using a simple semiconductor device, offering a route to largescale network deployments. Teleporting weak coherent states offers potential enhancements to state-of-the art quantum key distribution systems, as it creates output photons with sub-Poissonian statistics immune to the photon number-splitting attack, 17,18 and protects against intrusions. 19

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Side-Channel-Free Quantum Key Distribution

Cited by 616 publications

References 26 publications

Alternative schemes for measurement-device-independent quantum key distribution

Alternative schemes for measurement-device-independent quantum key distribution

Carving Secret Messages out of Public Information

An entangled-LED-driven quantum relay over 1 km

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