scholarly journals Device-independent verification of Einstein-Podolsky-Rosen steering

2021 ◽  
Author(s):  
Yuan-Yuan Zhao ◽  
Chao Zhang ◽  
Shuming Cheng ◽  
Xinhui Li ◽  
Yu Guo ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Entangled States ◽  
Independent Verification ◽  
Self Testing ◽  
Experimental Implementation ◽  
Einstein Podolsky Rosen ◽  
Complete Framework ◽  
Epr Steering

Abstract If the presence of entanglement could be certified in a device-independent (DI) way, it is likely to provide various quantum information processing tasks with unconditional security. Recently, it was shown that a DI protocol, combining measurement-device-independent techniques with self-testing, is able to verify all entangled states, however, it imposes demanding requirements on its experimental implementation. In this work, we propose a much less-demanding protocol based on Einstein-Podolsky-Rosen (EPR) steering to certify entanglement. We establish a complete framework for DI verification of EPR steering in which all steerable states could be verified. We then analyze its robustness towards noise and imperfections of self-testing by considering the measurement scenario with three settings at each side. Finally, a four-photon experiment is implemented to demonstrate that even Bell local states can be device-independently verified. Our work may pave the way for realistic applications of secure quantum information tasks.

Manipulation of Entangled States for Quantum Information Processing

2005 ◽  
pp. 49-58 ◽  
Author(s):  
S. Bose ◽  
S. F. Huelga ◽  
D. Jonathan ◽  
P. L. Knight ◽  
M. Murao ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Entangled States

scholarly journals Experimental implementation of quantum information processing by Zeeman-perturbed nuclear quadrupole resonance

2015 ◽  
Vol 14 (6) ◽  
pp. 1889-1906 ◽  
Author(s):  
João Teles ◽  
Christian Rivera-Ascona ◽  
Roberson S. Polli ◽  
Rodrigo Oliveira-Silva ◽  
Edson L. G. Vidoto ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Nuclear Quadrupole Resonance ◽  
Quantum Information Processing ◽  
Experimental Implementation ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

scholarly journals Realizing a deterministic source of multipartite-entangled photonic qubits

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Jean-Claude Besse ◽  
Kevin Reuer ◽  
Michele C. Collodo ◽  
Arne Wulff ◽  
Lucien Wernli ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Electromagnetic Radiation ◽  
Quantum Information Processing ◽  
Entangled States ◽  
Experimental Setting ◽  
Many Body ◽  
Body State ◽  
Process Tomography ◽  
Multi Mode

Abstract Sources of entangled electromagnetic radiation are a cornerstone in quantum information processing and offer unique opportunities for the study of quantum many-body physics in a controlled experimental setting. Generation of multi-mode entangled states of radiation with a large entanglement length, that is neither probabilistic nor restricted to generate specific types of states, remains challenging. Here, we demonstrate the fully deterministic generation of purely photonic entangled states such as the cluster, GHZ, and W state by sequentially emitting microwave photons from a controlled auxiliary system into a waveguide. We tomographically reconstruct the entire quantum many-body state for up to N = 4 photonic modes and infer the quantum state for even larger N from process tomography. We estimate that localizable entanglement persists over a distance of approximately ten photonic qubits.

scholarly journals Sudden death and revival of Gaussian Einstein–Podolsky–Rosen steering in noisy channels

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Xiaowei Deng ◽  
Yang Liu ◽  
Meihong Wang ◽  
Xiaolong Su ◽  
Kunchi Peng
Keyword(s):  
Quantum Information ◽  
Sudden Death ◽  
Quantum Information Processing ◽  
Excess Noise ◽  
Quantum Channels ◽  
Noisy Environment ◽  
Noisy Channels ◽  
Asymmetric Quantum ◽  
Einstein Podolsky Rosen ◽  
Epr Steering

AbstractEinstein–Podolsky–Rosen (EPR) steering is a useful resource for secure quantum information tasks. It is crucial to investigate the effect of inevitable loss and noise in quantum channels on EPR steering. We analyze and experimentally demonstrate the influence of purity of quantum states and excess noise on Gaussian EPR steering by distributing a two-mode squeezed state through lossy and noisy channels, respectively. We show that the impurity of state never leads to sudden death of Gaussian EPR steering, but the noise in quantum channel can. Then we revive the disappeared Gaussian EPR steering by establishing a correlated noisy channel. Different from entanglement, the sudden death and revival of Gaussian EPR steering are directional. Our result confirms that EPR steering criteria proposed by Reid and I. Kogias et al. are equivalent in our case. The presented results pave way for asymmetric quantum information processing exploiting Gaussian EPR steering in noisy environment.

Correlations, Nonlocality and Usefulness of an Efficient Class of Two-Qubit Mixed Entangled States

2018 ◽  
Vol 73 (3) ◽  
pp. 191-206 ◽  
Author(s):  
Parvinder Singh ◽  
Atul Kumar
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Weak Measurement ◽  
Analytical Relation ◽  
Entangled States ◽  
Mixed States ◽  
New Class ◽  
Chsh Inequality ◽  
Noisy Conditions

AbstractWe establish an analytical relation between the Bell-Clauser-Horne-Shimony-Holt (Bell-CHSH) inequality and weak measurement strengths under noisy conditions. We show that the analytical results obtained in this article are of utmost importance for proposing a new class of two-qubit mixed states for quantum information processing. Our analysis further shows that the states proposed here are better resources for quantum information in comparison to other two-qubit mixed entangled states.

BASIC OPERATIONS AMONG ENTANGLED STATES AND THEIR APPLICATIONS TO QUANTUM PROTOCOLS

2006 ◽  
Vol 04 (02) ◽  
pp. 307-323
Author(s):  
TAKASHI MIHARA
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Entangled States ◽  
Entangled State ◽  
Quantum Protocols ◽  
Original Message

It is thought that the techniques operating entangled states are some of the principal ones in quantum information processing. Therefore, procedures constructing other types of entangled states from some entangled states are useful. In this paper, we first show methods that dynamically change the number of entangled qubits during communication. Next, we propose a sharing protocol called the anonymous entangled state sharing protocol. By using this protocol, a party's message can be split among unknown parties because the parties can share entangled states without knowing each other. Finally, we show protocols that can recover an original message and split it to other parties without revealing its shared messages.

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