Single-photon two-qubit entangled states: preparation and measurement

Kim, Yoon-Ho

doi:10.1117/12.561343

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…This is achieved by replacing the two-photon BSM scheme in the original MDI-QKD protocol (Figure 5a) by a single-photon BSM scheme. 118 However, its ability to completely remove detector side-channel attacks has yet to be proven. Either countermeasures to Trojan horse attacks 119 or some trustworthiness to the BSM device is still required to establish the security of DDI-QKD.…”

Section: Mdi-qkdmentioning

confidence: 99%

Practical challenges in quantum key distribution

Diamanti¹,

Lo²,

Qi³

et al. 2016

npj Quantum Inf

633

468

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Quantum key distribution (QKD) promises unconditional security in data communication and is currently being deployed in commercial applications. Nonetheless, before QKD can be widely adopted, it faces a number of important challenges such as secret key rate, distance, size, cost and practical security. Here, we survey those key challenges and the approaches that are currently being taken to address them. For thousands of years, human beings have been using codes to keep secrets. With the rise of the Internet and recent trends to the Internet of Things, our sensitive personal financial and health data as well as commercial and national secrets are routinely being transmitted through the Internet. In this context, communication security is of utmost importance. In conventional symmetric cryptographic algorithms, communication security relies solely on the secrecy of an encryption key. If two users, Alice and Bob, share a long random string of secret bits-the key-then they can achieve unconditional security by encrypting their message using the standard one-time-pad encryption scheme. The central question then is: how do Alice and Bob share a secure key in the first place? This is called the key distribution problem. Unfortunately, all classical methods to distribute a secure key are fundamentally insecure because in classical physics there is nothing preventing an eavesdropper, Eve, from copying the key during its transit from Alice to Bob. On the other hand, standard asymmetric or public-key cryptography solves the key distribution problem by relying on computational assumptions such as the hardness of factoring. Therefore, such schemes do not provide information-theoretic security because they are vulnerable to future advances in hardware and algorithms, including the construction of a large-scale quantum computer.

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Section: Mdi-qkdmentioning

confidence: 99%

Practical challenges in quantum key distribution

Diamanti¹,

Lo²,

Qi³

et al. 2016

npj Quantum Inf

633

468

View full text Add to dashboard Cite

show abstract

“…Assure Alice and Bob share a maximally entangles states, it is possible for them to extract a secure key without information on “which detector clicked”. Following these results, they propose a new equivalent CQKD based on single-photon entanglement [23] , [24] in DI framework. A secure key can be extracted when Alice and Bob observe a violation of the Clauser-Horne inequality [25] .…”

Section: Security Analysismentioning

confidence: 98%

Counterfactual quantum key distribution with untrusted detectors

Lin¹,

Wang²,

Yang³

et al. 2023

Heliyon

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“…Oliveira et al implement Deutsch's algorithm with polarization and transverse spatial modes of the electromagnetic field as qubits [14]. Single-photon Bell states are prepared and measured [15]. Also the decoherence-free implementation of Deutsch's algorithm is reported by using such single-photon and by using two logical qubits [16].…”

Section: Introductionmentioning

confidence: 99%

Can Hidden Variables Theories Meet Quantum Computation?

Nagata¹,

Nakamura²

2015

OALib

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We study the relation between hidden variables theories and quantum computation. We discuss an inconsistency between a hidden variables theory and controllability of quantum computation. To derive the inconsistency, we use the maximum value of the square of an expected value. We propose a solution of the problem by using new hidden variables theory. Also we discuss an inconsistency between hidden variables theories and the double-slit experiment as the most basic experiment in quantum mechanics. This experiment can be an easy detector to Pauli observable. We cannot accept hidden variables theories to simulate the double-slit experiment in a specific case. Hidden variables theories may not depicture quantum detector. This is a quantum measurement theoretical profound problem.

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Single-photon two-qubit entangled states: preparation and measurement

Cited by 6 publications

References 13 publications

Practical challenges in quantum key distribution

Practical challenges in quantum key distribution

Counterfactual quantum key distribution with untrusted detectors

Can Hidden Variables Theories Meet Quantum Computation?

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