scholarly journals Coherent quantum ratchets driven by tunnel oscillations: Fluctuations and correlations

2012 ◽  
Vol 86 (11) ◽  
Author(s):  
Robert Hussein ◽  
Sigmund Kohler
Keyword(s):  
Quantum Ratchets ◽  
Coherent Quantum

scholarly journals Coherent quantum ratchets driven by tunnel oscillations

2010 ◽  
Vol 91 (2) ◽  
pp. 20007 ◽  
Author(s):  
M. Stark ◽  
S. Kohler
Keyword(s):  
Quantum Ratchets ◽  
Coherent Quantum

scholarly journals Molecular Wires Acting as Coherent Quantum Ratchets

2002 ◽  
Vol 88 (22) ◽  
Author(s):  
Jörg Lehmann ◽  
Sigmund Kohler ◽  
Peter Hänggi ◽  
Abraham Nitzan
Keyword(s):  
Molecular Wires ◽  
Quantum Ratchets ◽  
Coherent Quantum

scholarly journals Efficient experimental quantum fingerprinting with channel multiplexing and simultaneous detection

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiaoqing Zhong ◽  
Feihu Xu ◽  
Hoi-Kwong Lo ◽  
Li Qian
Keyword(s):  
Communication Complexity ◽  
Single Photon ◽  
Simultaneous Detection ◽  
Minimum Amount ◽  
Photon Detectors ◽  
Communication Time ◽  
Quantum Communication Complexity ◽  
Detection Of Signals ◽  
Coherent Quantum ◽  
Quantum Fingerprinting

AbstractQuantum communication complexity explores the minimum amount of communication required to achieve certain tasks using quantum states. One representative example is quantum fingerprinting, in which the minimum amount of communication could be exponentially smaller than the classical fingerprinting. Here, we propose a quantum fingerprinting protocol where coherent states and channel multiplexing are used, with simultaneous detection of signals carried by multiple channels. Compared with an existing coherent quantum fingerprinting protocol, our protocol could consistently reduce communication time and the amount of communication by orders of magnitude by increasing the number of channels. Our proposed protocol can even beat the classical limit without using superconducting-nanowire single photon detectors. We also report a proof-of-concept experimental demonstration with six wavelength channels to validate the advantage of our protocol in the amount of communication. The experimental results clearly prove that our protocol not only surpasses the best-known classical protocol, but also remarkably outperforms the existing coherent quantum fingerprinting protocol.

scholarly journals Duality between coherent quantum phase-slip and the Josephson junction in nanowires by dual Hamiltonian method

2019 ◽  
Vol 33 (25) ◽  
pp. 1950291
Author(s):  
M. Yoneda ◽  
M. Niwa ◽  
N. Hirata ◽  
M. Motohashi
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Josephson Junction ◽  
Quantum Phase ◽  
Quantum Field ◽  
Phase Slip ◽  
Hamiltonian Method ◽  
Single Junction ◽  
Quantum Phase Slip ◽  
Coherent Quantum

A method was devised to construct a generalized dual field theory with a quantum field theory named the dual Hamiltonian (DH) method. As a simple example using this method, we examined the duality between coherent quantum phase-slip and Josephson junction (JJ) in single junction systems and nanowires. This method was proved to be reliable within the Villain approximation.

scholarly journals Publisher's Note: Direct imaging of coherent quantum transport in graphenep−n−pjunctions [Phys. Rev. B92, 125414 (2015)]

2015 ◽  
Vol 92 (11) ◽  
Author(s):  
E. D. Herbschleb ◽  
R. K. Puddy ◽  
P. Marconcini ◽  
J. P. Griffiths ◽  
G. A. C. Jones ◽  
...  
Keyword(s):  
Quantum Transport ◽  
Direct Imaging ◽  
Coherent Quantum
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