scholarly journals Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels

1993 ◽  
Vol 70 (13) ◽  
pp. 1895-1899 ◽  
Author(s):  
Charles H. Bennett ◽  
Gilles Brassard ◽  
Claude Crépeau ◽  
Richard Jozsa ◽  
Asher Peres ◽  
...  
Keyword(s):  
Quantum State ◽  
Unknown Quantum State ◽  
Einstein Podolsky Rosen

scholarly journals Deterministic quantum teleportation through fiber channels

2018 ◽  
Vol 4 (10) ◽  
pp. eaas9401 ◽  
Author(s):  
Meiru Huo ◽  
Jiliang Qin ◽  
Jialin Cheng ◽  
Zhihui Yan ◽  
Zhongzhong Qin ◽  
...  
Keyword(s):  
Communication Networks ◽  
Quantum State ◽  
Optical Fibers ◽  
Quantum Teleportation ◽  
Continuous Variable ◽  
Entangled State ◽  
Optical Modes ◽  
Unknown Quantum State ◽  
Einstein Podolsky Rosen ◽  
Fiber Channels

Quantum teleportation, which is the transfer of an unknown quantum state from one station to another over a certain distance with the help of nonlocal entanglement shared by a sender and a receiver, has been widely used as a fundamental element in quantum communication and quantum computation. Optical fibers are crucial information channels, but teleportation of continuous variable optical modes through fibers has not been realized so far. Here, we experimentally demonstrate deterministic quantum teleportation of an optical coherent state through fiber channels. Two sub-modes of an Einstein-Podolsky-Rosen entangled state are distributed to a sender and a receiver through a 3.0-km fiber, which acts as a quantum resource. The deterministic teleportation of optical modes over a fiber channel of 6.0 km is realized. A fidelity of 0.62 ± 0.03 is achieved for the retrieved quantum state, which breaks through the classical limit of1/2. Our work provides a feasible scheme to implement deterministic quantum teleportation in communication networks.

Relative tomography of an unknown quantum state

2009 ◽  
Vol 79 (2) ◽  
Author(s):  
D. Mogilevtsev ◽  
J. Řeháček ◽  
Z. Hradil
Keyword(s):  
Quantum State ◽  
Unknown Quantum State

scholarly journals Practical quantum teleportation of an unknown quantum state

2017 ◽  
Vol 95 (5) ◽  
pp. 498-503
Author(s):  
Syed Tahir Amin ◽  
Aeysha Khalique
Keyword(s):  
Quantum State ◽  
Quantum Teleportation ◽  
Bell State ◽  
Linear Optics ◽  
State Measurement ◽  
Dark Counts ◽  
Experimental Parameters ◽  
Unknown Quantum State ◽  
Down Conversion ◽  
Good Agreement

We present our model to teleport an unknown quantum state using entanglement between two distant parties. Our model takes into account experimental limitations due to contribution of multi-photon pair production of parametric down conversion source, inefficiency, dark counts of detectors, and channel losses. We use a linear optics setup for quantum teleportation of an unknown quantum state by the sender performing a Bell state measurement. Our theory successfully provides a model for experimentalists to optimize the fidelity by adjusting the experimental parameters. We apply our model to a recent experiment on quantum teleportation and the results obtained by our model are in good agreement with the experimental results.

Quantum state sharing of an arbitrary m-particle state using Einstein–Podolsky–Rosen pairs and application in quantum voting

2021 ◽  
pp. 2150151
Author(s):  
Comfort Sekga ◽  
Mhlambululi Mafu
Keyword(s):  
Quantum State ◽  
Single Particle ◽  
Single Particle State ◽  
Electronic Voting ◽  
Particle State ◽  
Quantum State Sharing ◽  
Original State ◽  
Einstein Podolsky Rosen ◽  
Qubit States ◽  
Quantum Voting

In this paper, we propose a scheme where Alice shares an arbitrary m-particle unknown state with her agents, Bob and Charlie. Alice starts by distributing 2m Einstein–Podolsky–Rosen pairs with her agents and performs m joint three-particle Greenberger–Horne–Zeilinger state measurements on her particles. Bob, who acts as the controller, performs a product measurement [Formula: see text] on his m qubit states while Charlie retrieves the original state by performing unitary operations on his m particles. Subsequently, we demonstrate our proposed scheme’s feasibility by applying it in electronic voting by sharing an arbitrary single-particle state.

scholarly journals Twenty Years of Quantum State Teleportation at the Sapienza University in Rome

Entropy ◽  
2019 ◽  
Vol 21 (8) ◽  
pp. 768 ◽  
Author(s):  
Francesco De De Martini ◽  
Fabio Sciarrino
Keyword(s):  
Quantum Mechanics ◽  
Quantum Optics ◽  
Quantum State ◽  
Quantum Teleportation ◽  
Feed Forward ◽  
Unknown Quantum State ◽  
University Of Rome ◽  
The University ◽  
First Time

Quantum teleportation is one of the most striking consequence of quantum mechanics and is defined as the transmission and reconstruction of an unknown quantum state over arbitrary distances. This concept was introduced for the first time in 1993 by Charles Bennett and coworkers, it has then been experimentally demonstrated by several groups under different conditions of distance, amount of particles and even with feed forward. After 20 years from its first realization, this contribution reviews the experimental implementations realized at the Quantum Optics Group of the University of Rome La Sapienza.

scholarly journals Weak cloning of an unknown quantum state

2006 ◽  
Vol 354 (5-6) ◽  
pp. 396-398 ◽  
Author(s):  
Erik Sjöqvist ◽  
Johan Åberg
Keyword(s):  
Quantum State ◽  
Unknown Quantum State

scholarly journals Impossibility of deleting an unknown quantum state

Nature ◽  
2000 ◽  
Vol 404 (6774) ◽  
pp. 164-165 ◽  
Author(s):  
Arun Kumar Pati ◽  
Samuel L. Braunstein
Keyword(s):  
Quantum State ◽  
Unknown Quantum State

scholarly journals Selfcomplementary Quantum Channels

2016 ◽  
Vol 23 (03) ◽  
pp. 1650014 ◽  
Author(s):  
Marek Smaczyński ◽  
Wojciech Roga ◽  
Karol Życzkowski
Keyword(s):  
Quantum System ◽  
Large Class ◽  
Time Evolution ◽  
Quantum State ◽  
Quantum Channels ◽  
Unknown Quantum State ◽  
Interacting Systems

Selfcomplementary quantum channels are characterized by such an interaction between the principal quantum system and the environment that leads to the same output states of both interacting systems. These maps can describe approximate quantum copy machines, as perfect copying of an unknown quantum state is not possible due to the celebrated no-cloning theorem. We provide here a parametrization of a large class of selfcomplementary channels and analyze their properties. Selfcomplementary channels preserve some residual coherences and residual entanglement. Investigating some measures of non-Markovianity, we show that time evolution under selfcomplementary channels is highly non-Markovian.

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