Quantum cryptography: theory and practice
arXiv:0808.1385
Abstract
A highly attenuated laser pulse which gives a weak coherent state is widely used in quantum key distribution (QKD) experiments. A weak coherent state has multi-photon components, which opens up a security loophole to the sophisticated eavesdropper. With a small adjustment of the hardware, we prove that the decoy state method can close this loophole and substantially improve the QKD performance. We also propose a few practical decoy state protocols, study statistical fluctuations and perform experimental demonstrations. Moreover, we apply the methods from entanglement distillation protocols based on two-way classical communication to improve the decoy state QKD performance. Furthermore, we study the decoy state methods for other single photon sources, such as triggering parametric down-conversion (PDC) source. We propose a model and post-processing scheme for the entanglement-based QKD with a PDC source. Although the model is proposed to study the entanglement-based QKD, we emphasize that our generic model may also be useful for other non-QKD experiments involving a PDC source. By simulating a real PDC experiment, we show that the entanglement-based QKD can achieve longer maximal secure distance than the single-photon-based QKD schemes. We present a time-shift attack that exploits the efficiency mismatch of two single photon detectors in a QKD system. This eavesdropping strategy can be realized by current technology. We also discuss counter measures against the attack and study the security of a QKD system with efficiency mismatch detectors.
Ph.D. Thesis; University of Toronto
References in corpus (64)
- Quantum Cryptography
- Mixed State Entanglement and Quantum Error Correction
- Simple Proof of Security of the BB84 Quantum Key Distribution Protocol
- Good Quantum Error-Correcting Codes Exist
- Decoy State Quantum Key Distribution
- Unconditional Security Of Quantum Key Distribution Over Arbitrarily Long Distances
- Quantum Teleportation is a Universal Computational Primitive
- Quantum Key Distribution with High Loss: Toward Global Secure Communication
- Beating the PNS attack in practical quantum cryptography
- Quantum privacy amplification and the security of quantum cryptography over noisy channels
- Free-Space distribution of entanglement and single photons over 144 km
- Practical Decoy State for Quantum Key Distribution
- Quantum Cryptography with Entangled Photons
- Optimal eavesdropping in quantum cryptography with six states
- Quantum cryptography protocols robust against photon number splitting attacks for weak laser pulses implementations
- Security against individual attacks for realistic quantum key distribution
- From Bell's Theorem to Secure Quantum Key Distribution
- Generation of Nonclassical Photon Pairs for Scalable Quantum Communication with Atomic Ensembles
- Quantum Cryptography with Coherent States
- Quantum Hacking: Experimental demonstration of time-shift attack against practical quantum key distribution systems
- Quantum Cryptography using entangled photons in energy-time Bell states
- Effects of detector efficiency mismatch on security of quantum cryptosystems
- Experimental Long-Distance Decoy-State Quantum Key Distribution Based On Polarization Encoding
- Experimental Quantum Key Distribution with Decoy States
- Long distance decoy state quantum key distribution in optical fiber
- Secure key from bound entanglement
- Entanglement as precondition for secure quantum key distribution
- Lower and upper bounds on the secret key rate for QKD protocols using one--way classical communication
- Quantum key distribution with entangled photon sources
- Long-Distance Quantum Communication with Entangled Photons using Satellites
- Noise-free high-efficiency photon-number-resolving detectors
- A decoy-state protocol for quantum cryptography with 4 intensities of coherent states
- Postselected versus nonpostselected quantum teleportation using parametric down-conversion
- Simple and efficient quantum key distribution with parametric down-conversion
- Secure quantum key distribution with an uncharacterized source
- Squashing Models for Optical Measurements in Quantum Communication
- Unconditional security of coherent-state quantum key distribution with strong phase-reference pulse
- GHz QKD at telecom wavelengths using up-conversion detectors
- Security proof for QKD systems with threshold detectors
- Passive decoy state quantum key distribution: Closing the gap to perfect sources
- Practical decoy state method in quantum key distribution with heralded single photon source
- Improved practical decoy state method in quantum key distribution with parametric down conversion source
- Efficient bipartite quantum state purification in arbitrary dimensional Hilbert spaces
- Local permutations of products of Bell states and entanglement distillation
- Decoy state quantum key distribution with two-way classical post-processing
- Quantum key distribution with triggering parametric down conversion sources
- Unconditionally secure key distillation from multi-photons
- Interpolation of recurrence and hashing entanglement distillation protocols
- Unconditional security of the Bennett 1992 quantum key-distribution scheme with strong reference pulse
- Experimental Decoy Quantum Key Distribution Up To 130KM Fiber
- Quantum key distribution with "dual detectors"
- Enhancing practical security of quantum key distribution with a few decoy states
- Proof-of-Concept Experiments for Quantum Physics in Space
- Efficient quantum key distribution with practical sources and detectors
- Space-to-ground quantum-communication using an optical ground station: a feasibility study
- Phase randomization improves the security of quantum key distribution
- Simple security proof of quantum key distribution via uncertainty principle
- Security analysis of decoy state quantum key distribution incorporating finite statistics
- Complementarity, distillable secret key, and distillable entanglement
- Security of Quantum Key Distribution with Realistic Devices
- Security of quantum key distribution with discrete rotational symmetry
- Unconditional security at a low cost
- Security of quantum key distribution using weak coherent states with nonrandom phases
- On the numerical characterization of atmospheric effects on an Earth-Space quantum communication channel
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