scholarly journals Weak classicality in coupled N-level quantum systems

2019 ◽  
Vol 73 (6) ◽  
Author(s):  
Radha Pyari Sandhir ◽  
V. Ravishankar
Keyword(s):  
Quantum Systems ◽  
N Level

Non-integrability of the optimal control problem for n-level quantum systems

2017 ◽  
Vol 50 (17) ◽  
pp. 175202 ◽  
Author(s):  
Guillaume Duval ◽  
Andrzej Maciejewski ◽  
Witold Respondek
Keyword(s):  
Optimal Control ◽  
Optimal Control Problem ◽  
Control Problem ◽  
Quantum Systems ◽  
N Level

On observability of N-level quantum systems

1985 ◽  
Vol 21 (1) ◽  
pp. 101-109 ◽  
Author(s):  
A. Jamiolkowski
Keyword(s):  
Quantum Systems ◽  
N Level

scholarly journals On the preservation of commutation and anticommutation relations of n-level quantum systems

2013 ◽  
Author(s):  
Luis A. Duffaut Espinosa ◽  
Z. Miao ◽  
I. R. Petersen ◽  
V. Ugrinovskii ◽  
M. R. James
Keyword(s):  
Quantum Systems ◽  
N Level

Coherent quantum observers for n-level quantum systems

2013 ◽  
Author(s):  
Z. Miao ◽  
Luis A. Duffaut Espinosa ◽  
I. R. Petersen ◽  
V. Ugrinovskii ◽  
M. R. James
Keyword(s):  
Quantum Systems ◽  
N Level ◽  
Coherent Quantum

scholarly journals Secure N-dimensional simultaneous dense coding and applications

2015 ◽  
Vol 13 (07) ◽  
pp. 1550051 ◽  
Author(s):  
H. Situ ◽  
D. Qiu ◽  
P. Mateus ◽  
N. Paunković
Keyword(s):  
Fourier Transform ◽  
Bell State ◽  
Quantum Systems ◽  
Ghz State ◽  
Quantum Fourier Transform ◽  
Dense Coding ◽  
N Level ◽  
In Series ◽  
Contract Signing ◽  
Swap Operator

Simultaneous dense coding (SDC) guarantees that Bob and Charlie simultaneously receive their respective information from Alice in their respective processes of dense coding. The idea is to use the so-called locking operation to “lock” the entanglement channels, thus requiring a joint unlocking operation by Bob and Charlie in order to simultaneously obtain the information sent by Alice. We present some new results on SDC: (1) We propose three SDC protocols, which use different N-dimensional entanglement (Bell state, W state and GHZ state). (2) Besides the quantum Fourier transform, two new locking operators are introduced (the double controlled-NOT operator and the SWAP operator). (3) In the case that spatially distant Bob and Charlie have to finalize the protocol by implementing the unlocking operation through communication, we improve our protocol’s fairness, with respect to Bob and Charlie, by implementing the unlocking operation in series of steps. (4) We improve the security of SDC against the intercept–resend attack. (5) We show that SDC can be used to implement a fair contract signing protocol. (6) We also show that the N-dimensional quantum Fourier transform can act as the locking operator in simultaneous teleportation of N-level quantum systems.

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