Controlled quantum key distribution with three-photon polarization-entangled states via the collective noise channel

2011 ◽  
Vol 113 (4) ◽  
pp. 583-591 ◽  
Author(s):  
Li Dong ◽  
Xiao-Ming Xiu ◽  
Ya-Jun Gao ◽  
X. X. Yi
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Entangled States ◽  
Collective Noise ◽  
Photon Polarization

ERROR-REJECTING BENNETT–BRASSARD–MERMIN QUANTUM KEY DISTRIBUTION PROTOCOL BASED ON LINEAR OPTICS OVER A COLLECTIVE-NOISE CHANNEL

2010 ◽  
Vol 08 (07) ◽  
pp. 1141-1151 ◽  
Author(s):  
XI-HAN LI ◽  
XIAO-JIAO DUAN ◽  
FU-GUO DENG ◽  
HONG-YU ZHOU
Keyword(s):  
Quantum Entanglement ◽  
Quantum Key Distribution ◽  
Quantum Information Processing ◽  
Key Distribution ◽  
Entangled State ◽  
Collective Noise ◽  
Linear Optics ◽  
Entanglement Purification ◽  
Measurement Results ◽  
Entangled Quantum States

Quantum entanglement is an important element of quantum information processing. Sharing entangled quantum states between two remote parties is a precondition of most quantum communication schemes. We will show that the protocol proposed by Yamamoto et al. (Phys. Rev. Lett.95 (2005) 040503) for transmitting single quantum qubit against collective noise with linear optics is also suitable for distributing the components of entanglements with some modifications. An additional qubit is introduced to reduce the effect of collective noise, and the receiver can take advantage of the time discrimination and the measurement results of the assistant qubit to reconstruct a pure entanglement with the sender. Although the scheme succeeds probabilistically, the fidelity of the entangled state is almost unity in principle. The resource used in our protocol to get a pure entangled state is finite, which establishes entanglement more easily in practice than quantum entanglement purification. Also, we discuss its application in quantum key distribution over a collective channel in detail.

scholarly journals Clocks without “Time” in Entangled-State Experiments

Entropy ◽  
2020 ◽  
Vol 22 (4) ◽  
pp. 434
Author(s):  
F. Hadi Madjid ◽  
John M. Myers
Keyword(s):  
General Relativity ◽  
Special Relativity ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Entangled States ◽  
Entangled State ◽  
Definition Of ◽  
Do So

Entangled states of light exhibit measurable correlations between light detections at separated locations. These correlations are exploited in entangled-state quantum key distribution. To do so involves setting up and maintaining a rhythm of communication among clocks at separated locations. Here, we try to disentangle our thinking about clocks as used in actual experiments from theories of time, such as special relativity or general relativity, which already differ between each other. Special relativity intertwines the concept of time with a particular definition of the synchronization of clocks, which precludes synchronizing every clock to every other clock. General relativity imposes additional barriers to synchronization, barriers that invite seeking an alternative depending on any global concept of time. To this end, we focus on how clocks are actually used in some experimental situations. We show how working with clocks without worrying about time makes it possible to generalize some designs for quantum key distribution and also clarifies the need for alternatives to the special-relativistic definition of synchronization.

scholarly journals An improved coding method of quantum key distribution protocols based on Fibonacci-valued OAM entangled states

2017 ◽  
Vol 381 (35) ◽  
pp. 2922-2926 ◽  
Author(s):  
Hong Lai ◽  
Ming-Xing Luo ◽  
Cheng Zhan ◽  
Josef Pieprzyk ◽  
Mehmet A. Orgun
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Entangled States ◽  
Coding Method

Robust quantum key distribution with two-photon polarization states

2006 ◽  
Vol 359 (2) ◽  
pp. 126-128 ◽  
Author(s):  
Ming Gao ◽  
Lin-Mei Liang ◽  
Cheng-Zu Li ◽  
Chen-Lin Tian
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Photon Polarization ◽  
Two Photon ◽  
Polarization States

scholarly journals TIGHTENING THE EAVESDROPPING ACCESSIBLE INFORMATION FOR CONTINUOUS VARIABLE QUANTUM KEY DISTRIBUTION PROTOCOLS THAT INVOLVE NONMAXIMALLY ENTANGLEMENT

2012 ◽  
Vol 26 (16) ◽  
pp. 1250109 ◽  
Author(s):  
A. BECIR ◽  
M. R. B. WAHIDDIN
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Continuous Variable ◽  
Upper Bounds ◽  
Entangled States ◽  
Entangled State ◽  
Protocol Implementation ◽  
Accessible Information ◽  
Heisenberg Uncertainty

In this paper, we derive tight bounds for the eavesdropping attacks on continuous variable quantum key distribution (CV-QKD) protocol that involves nonmaximally entangled states. We show that deriving bounds on the eavesdropper's accessible information based on the Heisenberg uncertainty yields upper bounds, but those bounds are not tight. For this reason, we follow different techniques to derive the desired tight bounds. The new bounds are tight for all CV-QKD protocols that involve two-mode entangled state. Our derivations are applied to direct and reverse reconciliation schemes of protocol implementation, respectively.

scholarly journals FAULT TOLERANT QUANTUM KEY DISTRIBUTION BASED ON QUANTUM DENSE CODING WITH COLLECTIVE NOISE

2009 ◽  
Vol 07 (08) ◽  
pp. 1479-1489 ◽  
Author(s):  
XI-HAN LI ◽  
BAO-KUI ZHAO ◽  
YU-BO SHENG ◽  
FU-GUO DENG ◽  
HONG-YU ZHOU
Keyword(s):  
Quantum Key Distribution ◽  
Fault Tolerant ◽  
Single Photon ◽  
Bell State ◽  
Key Distribution ◽  
Secret Message ◽  
Noisy Channel ◽  
Collective Noise ◽  
Dense Coding ◽  
Quantum Dense Coding

We present two robust quantum key distribution protocols against two kinds of collective noise, following some ideas in quantum dense coding. Three-qubit entangled states are used as quantum information carriers, two of which form the logical qubit, which is invariant with a special type of collective noise. The information is encoded on logical qubits with four unitary operations, which can be read out faithfully with Bell-state analysis on two physical qubits and a single-photon measurement on the other physical qubit, not three-photon joint measurements. Two bits of information are exchanged faithfully and securely by transmitting two physical qubits through a noisy channel. When the losses in the noisy channel is low, these protocols can be used to transmit a secret message directly in principle.

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