Entanglement Based Quantum Key Distribution Using a Bright Sagnac Entangled Photon Source

Erven, Chris; Hamel, Deny R.; Resch, Kevin J.; Laflamme, Raymond; Weihs, Gregor

doi:10.1007/978-3-642-11731-2_14

Cited by 8 publications

(8 citation statements)

References 13 publications

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“…Other experiments listed in Table 1 relate to long distance polarization entanglement experiments and demonstrations of quantum teleportation, such as those reported in Refs [20][21][22][23]. Finally, a recent QKD practical application was reported using an improved entangled photon source [24]. Table 3 below describes demonstration experiments related to single photon and photon beam exchanges from ground to space as reported in Refs.…”

Section: Introductionmentioning

confidence: 94%

Review of representative free-space quantum communications experiments

et al. 2010

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Worldwide free-space quantum communications (QC) experiments over the past decade are reviewed and discussed with attention to technological QC trends. Experiments reported in the open literature have included those conducted along horizontal propagation paths of varying distances, as well as communication paths from ground-to-aircraft, ground-to-space, and demonstrations in the laboratory. Available data characterize propagation distances, transmission speeds, quantum key distribution (QKD) protocols, and quantum bit error rates (QBER). While ber optic implementations of quantum communications technologies are currently being tested for communications infrastructure it is important to also consider that free-space quantum communications will play an important role in securing such applications as earth-to-satellite, end of line connects, and defense implementations.

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Section: Introductionmentioning

confidence: 94%

Review of representative free-space quantum communications experiments

et al. 2010

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“…3. Entangled photon pairs are produced with a Sagnac interferometric entangled photon source [40][41][42][43] consisting of a periodically poled KTP (PPKTP) non-linear optical crystal produced for a collinear configuration placed in the middle of an interferometer loop. Entangled photons are produced by sending 45 • polarized light at 404 nm onto a dual wavelength polarizing beamsplitter (dual PBS) at the apex of the loop, thus bi-directionally pumping the PPKTP crystal.…”

Section: Experimental Implementationmentioning

confidence: 99%

An experimental implementation of oblivious transfer in the noisy storage model

Erven

Gigov

et al. 2014

Nat Commun

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Cryptography's importance in our everyday lives continues to grow in our increasingly digital world. Oblivious transfer has long been a fundamental and important cryptographic primitive, as it is known that general two-party cryptographic tasks can be built from this basic building block. Here we show the experimental implementation of a 1-2 random oblivious transfer protocol by performing measurements on polarization-entangled photon pairs in a modified entangled quantum key distribution system, followed by all of the necessary classical postprocessing including one-way error correction. We successfully exchange a 1,366 bit random oblivious transfer string in B3 min and include a full security analysis under the noisy storage model, accounting for all experimental error rates and finite size effects. This demonstrates the feasibility of using today's quantum technologies to implement secure two-party protocols.

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“…Thus, we modified our existing entangled QKD system [39,40] to implement the first ROT protocol secured under the noisy storage model. The key difference to keep in mind is that while loss merely affects the overall key rate in a QKD system, in ROT loss is integral to the security of the scheme and if not properly bounded can prevent any secure ROT string from being generated.…”

Section: Experimental Implementationmentioning

confidence: 99%

Section: Experimental Implementationmentioning

confidence: 99%

Experimental Implementation of Oblivious Transfer in the Noisy Storage Model

Erven

Wehner

Laflamme

et al. 2012

Conference on Lasers and Electro-Optics 2012

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Cryptography's importance in our everyday lives continues to grow in our increasingly digital world. Oblivious transfer (OT) has long been a fundamental and important cryptographic primitive since it is known that general two-party cryptographic tasks can be built from this basic building block. Here we show the experimental implementation of a 1-2 random oblivious transfer (ROT) protocol by performing measurements on polarization-entangled photon pairs in a modified entangled quantum key distribution system, followed by all of the necessary classical post-processing including one-way error correction. We successfully exchange a 1,366 bits ROT string in ∼3 min and include a full security analysis under the noisy storage model, accounting for all experimental error rates and finite size effects. This demonstrates the feasibility of using today's quantum technologies to implement secure two-party protocols.Cryptography, prior to the modern computing age, was synonymous with the protection of private communications using a variety of encryption techniques, such as a wax seal or substitution cypher. However, with the advent of modern digital computing and an increasingly internet-driven society, important new cryptographic challenges have arisen. People now wish to do business and interact with others they neither know nor trust. In the field of cryptography this is known as secure two-party computation. Here we have two users, Alice and Bob, who wish to perform a computation on their private inputs in such a way that they obtain the correct output but without revealing any additional information about their inputs.A particularly important and familiar example is the task of secure identification, which we perform any time we use a bank's ATM to withdraw money. Here honest Alice (the bank) and honest Bob (the legitimate customer) share a password. When authenticating a new session, Alice checks to make sure she is really interacting with Bob by validating his password before dispensing any money. However, we do not want Bob to simply announce his password since a malicious Alice could steal his password and impersonate him in the future. What we require is a method for checking whether Bob's password is valid without revealing any additional information. While protocols for general two-party cryptographic tasks such as this one may be very involved, it is known that they can be built from a basic cryptographic building block called oblivious transfer (OT) [1].Many classical cryptography techniques currently in use have their security based on conjectured mathematical assumptions such as the hardness of finding the prime factors of a large number, assumptions which no longer hold once a sufficiently large quantum computer is built [2]. Alternatively, quantum cryptography offers means to accomplish cryptographic tasks which are provably secure using fewer assumptions that are ideally much more stringent than those employed classically. However, until now almost all of the experimental work has focused exclusively on q...

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Entanglement Based Quantum Key Distribution Using a Bright Sagnac Entangled Photon Source

Cited by 8 publications

References 13 publications

Review of representative free-space quantum communications experiments

Review of representative free-space quantum communications experiments

An experimental implementation of oblivious transfer in the noisy storage model

Experimental Implementation of Oblivious Transfer in the Noisy Storage Model

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