Coherent manipulation of coupled Josephson charge qubits

2005 ◽  
Vol 426-431 ◽  
pp. 1552-1560 ◽  
Author(s):  
Yu.A. Pashkin ◽  
T. Yamamoto ◽  
O. Astafiev ◽  
Y. Nakamura ◽  
D.V. Averin ◽  
...  
Keyword(s):  
Charge Qubits ◽  
Coherent Manipulation

RECENT RESULTS IN EXPERIMENTS WITH JOSEPHSON QUBITS

2005 ◽  
Vol 03 (supp01) ◽  
pp. 173-196
Author(s):  
OLEG ASTAFIEV ◽  
YURI PASHKIN ◽  
TSUYOSHI YAMAMOTO ◽  
YASUNOBU NAKAMURA ◽  
JAWSHEN TSAI
Keyword(s):  
Single Shot ◽  
Charge Qubits ◽  
Coherent Manipulation ◽  
Coupled Qubits

We demonstrate our recent experiments on Josephson charge qubits: coherent manipulation of two electrostatically coupled qubits, controlled-NOT operation, single-shot readout, and study of decoherence mechanisms with help of the single-shot readout.

scholarly journals Coherent manipulation and quantum phase interference in a fullerene-based electron triplet molecular qutrit

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Ye-Xin Wang ◽  
Zheng Liu ◽  
Yu-Hui Fang ◽  
Shen Zhou ◽  
Shang-Da Jiang ◽  
...  
Keyword(s):  
Quantum Information Processing ◽  
Quantum Phase ◽  
Information Storage ◽  
Paramagnetic Resonance ◽  
Molecular Electron ◽  
Phase Interference ◽  
Superposition States ◽  
Pulsed Electron Paramagnetic Resonance ◽  
Electron Paramagnetic ◽  
Coherent Manipulation

AbstractHigh-spin magnetic molecules are promising candidates for quantum information processing because their intrinsic multiplicity facilitates information storage and computational operations. However, due to the absence of suitable sublevel splittings, their susceptibility to environmental disturbances and limitation from the selection rule, the arbitrary control of the quantum state of a molecular electron multiplet has not been realized. Here, we exploit the photoexcited triplet of C70 as a molecular electron spin qutrit with pulsed electron paramagnetic resonance. We prepared the system into 3-level superposition states characteristic of a qutrit and validated them by the tomography of their density matrices. To further elucidate the coherence of the operation and the nature of the system as a qutrit, we demonstrated the quantum phase interference in the superposition. The interference pattern is further interpreted as a map of possible evolution paths in the space of phase factors, representing the quantum nature of the 3-level system.

Robust control of Josephson charge qubits

2009 ◽  
Vol 105 (8) ◽  
pp. 084504 ◽  
Author(s):  
M. Wenin ◽  
R. Roloff ◽  
W. Pötz
Keyword(s):  
Robust Control ◽  
Charge Qubits

scholarly journals Decoherence-free states for charge qubits under local nonuniformity

2005 ◽  
Vol 72 (8) ◽  
Author(s):  
Tetsufumi Tanamoto ◽  
Shinobu Fujita
Keyword(s):  
Charge Qubits
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