scholarly journals A comparative study of protocols for secure quantum communication under noisy environment: single-qubit-based protocols versus entangled-state-based protocols

2016 ◽  
Vol 15 (11) ◽  
pp. 4681-4710 ◽  
Author(s):  
Vishal Sharma ◽  
Kishore Thapliyal ◽  
Anirban Pathak ◽  
Subhashish Banerjee
Keyword(s):  
Comparative Study ◽  
Quantum Communication ◽  
Entangled State ◽  
Noisy Environment ◽  
Single Qubit

Multi-party qutrit-state sharing under decoherence

2020 ◽  
Vol 34 (12) ◽  
pp. 2050124
Author(s):  
Zhiming Huang ◽  
Zhimin He
Keyword(s):  
Quantum System ◽  
Quantum State ◽  
Quantum Coherence ◽  
Quantum Communication ◽  
Communication Protocol ◽  
Entangled State ◽  
Quantum State Sharing ◽  
Noisy Environment ◽  
Realistic Situation ◽  
Quantum Communication Protocol

Quantum state sharing plays an important role in both transmitting and protecting a quantum secret information. However, in a realistic situation, quantum communication protocol is inevitably affected by the decoherence and noise induced by the interaction between quantum system and environment, which often destroys quantum resource, such as degrading entangled state that is often used as the key resource of quantum communication. In this paper, we intend to investigate the influence of amplitude damping (AD) decoherence on multi-party qutrit-state sharing (MQSS) scheme. We firstly construct the noisy model of MQSS, and then analyze the effect of decoherence on the MQSS. In addition, the relation of variations between MQSS performance and quantum coherence is illustrated. Furthermore, we propose a partial measurement to enhance the performance of the MQSS under noisy environment.

scholarly journals SUDDEN CHANGE OF QUANTUM DISCORD UNDER SINGLE QUBIT NOISE

2013 ◽  
Vol 11 (05) ◽  
pp. 1350048 ◽  
Author(s):  
LI-XING JIA ◽  
BO LI ◽  
R.-H. YUE ◽  
HENG FAN
Keyword(s):  
Quantum System ◽  
Quantum Correlation ◽  
Quantum Discord ◽  
Sudden Change ◽  
Entangled State ◽  
Noisy Environment ◽  
Noisy Environments ◽  
Single Qubit ◽  
Sudden Transition

We show that the sudden change of quantum correlation can occur even when only one part of the composite entangled state is exposed to a noisy environment. Our results are illustrated through the action of different noisy environments individually on a single qubit of quantum system. Composite noise on the whole of the quantum system is thus not the necessarily condition for the occurrence of sudden transition for quantum correlation.

Hierarchical controlled quantum communication via the χ state under noisy environment

2020 ◽  
Vol 35 (37) ◽  
pp. 2050306
Author(s):  
Nian-Nian Wang ◽  
Song-Ya Ma ◽  
Xiang Li
Keyword(s):  
Quantum Information ◽  
Quantum Communication ◽  
Qubit State ◽  
Noisy Environment ◽  
Average Fidelity ◽  
Single Qubit ◽  
Phase Damping ◽  
Measurement Basis ◽  
Remote Preparation ◽  
Controlled Remote Preparation

Wang et al. first studied hierarchical quantum information splitting of an arbitrary single-qubit state via the [Formula: see text] state as the entangled channel. There exists a hierarchy among the three receivers as far as the power to recover the teleported state is concerned. But the scheme is considered in ideal environment. In this paper, we reinvestigate the scheme in amplitude-damping and phase-damping noises. The fidelity and average fidelity are adopted to quantify the effect of noise. It is found that they are both dependent on the coefficients of the teleported state and the noise parameter. Moreover, we put forward a novel deterministic scheme to realize hierarchical controlled remote preparation of an arbitrary single-qubit state. Comparing with the previous scheme via the [Formula: see text] state, the sender does not need to perform information dividing due to the subtly constructed measurement basis. We also consider the proposed scheme under noisy environment.

scholarly journals Optimal teleportation via noisy quantum channels without additional qubit resources

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Dong-Gil Im ◽  
Chung-Hyun Lee ◽  
Yosep Kim ◽  
Hyunchul Nha ◽  
M. S. Kim ◽  
...  
Keyword(s):  
Quantum Computing ◽  
Quantum Teleportation ◽  
Quantum Communication ◽  
Quantum Noise ◽  
Single Copy ◽  
Entangled State ◽  
Quantum Network ◽  
Quantum Channels ◽  
Maximally Entangled State ◽  
Near Term

AbstractQuantum teleportation exemplifies how the transmission of quantum information starkly differs from that of classical information and serves as a key protocol for quantum communication and quantum computing. While an ideal teleportation protocol requires noiseless quantum channels to share a pure maximally entangled state, the reality is that shared entanglement is often severely degraded due to various decoherence mechanisms. Although the quantum noise induced by the decoherence is indeed a major obstacle to realizing a near-term quantum network or processor with a limited number of qubits, the methodologies considered thus far to address this issue are resource-intensive. Here, we demonstrate a protocol that allows optimal quantum teleportation via noisy quantum channels without additional qubit resources. By analyzing teleportation in the framework of generalized quantum measurement, we optimize the teleportation protocol for noisy quantum channels. In particular, we experimentally demonstrate that our protocol enables to teleport an unknown qubit even via a single copy of an entangled state under strong decoherence that would otherwise preclude any quantum operation. Our work provides a useful methodology for practically coping with decoherence with a limited number of qubits and paves the way for realizing noisy intermediate-scale quantum computing and quantum communication.

Schemes for Teleportation of an Unknown Single-Qubit Quantum State by Using an Arbitrary High-Dimensional Entangled State

2010 ◽  
Vol 27 (1) ◽  
pp. 010307 ◽  
Author(s):  
Zhan You-Bang ◽  
Zhang Qun-Yong ◽  
Wang Yu-Wu ◽  
Ma Peng-Cheng
Keyword(s):  
Quantum State ◽  
High Dimensional ◽  
Entangled State ◽  
Single Qubit

Tripartite quantum operation sharing with six-qubit highly entangled state

2021 ◽  
pp. 2150034
Author(s):  
Zhanjun Zhang
Keyword(s):  
Essential Role ◽  
The State ◽  
Entangled State ◽  
Quantum Operation ◽  
Single Qubit ◽  
Experimental Implementation ◽  
Distant Target ◽  
The Given ◽  
Target Qubit ◽  
Qubit Operation

A three-party scheme for sharing an arbitrary single-qubit operation on a distant target qubit is proposed by first utilizing a six-qubit genuinely entangled state presented by [Borras et al., J. Phys. A 40, 13407 (2007)]. The security of the scheme is simply analyzed and ensured. The essential role which the state in the given qubit distribution plays in the QOS task is revealed. The important features including the sharing determinacy and the sharer symmetry are identified. Moreover, the experimental implementation feasibility of the scheme is discussed and confirmed.

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