scholarly journals Model for monitoring of a charge qubit using a radio-frequency quantum point contact including experimental imperfections

2008 ◽  
Vol 77 (12) ◽  
Author(s):  
Neil P. Oxtoby ◽  
Jay Gambetta ◽  
H. M. Wiseman
Keyword(s):  
Radio Frequency ◽  
Point Contact ◽  
Quantum Point Contact ◽  
Charge Qubit ◽  
Quantum Point ◽  
A Charge

scholarly journals A circuit analysis of an in situ tunable radio-frequency quantum point contact

2013 ◽  
Vol 84 (8) ◽  
pp. 083902 ◽  
Author(s):  
T. Müller ◽  
T. Choi ◽  
S. Hellmüller ◽  
K. Ensslin ◽  
T. Ihn ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Point Contact ◽  
Circuit Analysis ◽  
Quantum Point Contact ◽  
Quantum Point

scholarly journals Single shot charge detection using a radio-frequency quantum point contact

2007 ◽  
Vol 91 (22) ◽  
pp. 222104 ◽  
Author(s):  
M. C. Cassidy ◽  
A. S. Dzurak ◽  
R. G. Clark ◽  
K. D. Petersson ◽  
I. Farrer ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Point Contact ◽  
Quantum Point Contact ◽  
Single Shot ◽  
Charge Detection ◽  
Quantum Point

scholarly journals Mapping out spin and particle conductances in a quantum point contact

2016 ◽  
Vol 113 (29) ◽  
pp. 8144-8149 ◽  
Author(s):  
Sebastian Krinner ◽  
Martin Lebrat ◽  
Dominik Husmann ◽  
Charles Grenier ◽  
Jean-Philippe Brantut ◽  
...  
Keyword(s):  
Chemical Potential ◽  
Weak Interactions ◽  
Point Contact ◽  
Single Mode ◽  
Fermi Gas ◽  
Strong Interactions ◽  
Quantum Point Contact ◽  
Quantum Point ◽  
A Charge ◽  
Spin Conductance

We study particle and spin transport in a single-mode quantum point contact, using a charge neutral, quantum degenerate Fermi gas with tunable, attractive interactions. This yields the spin and particle conductance of the point contact as a function of chemical potential or confinement. The measurements cover a regime from weak attraction, where quantized conductance is observed, to the resonantly interacting superfluid. Spin conductance exhibits a broad maximum when varying the chemical potential at moderate interactions, which signals the emergence of Cooper pairing. In contrast, the particle conductance is unexpectedly enhanced even before the gas is expected to turn into a superfluid, continuously rising from the plateau at 1/h for weak interactions to plateau-like features at nonuniversal values as high as 4/h for intermediate interactions. For strong interactions, the particle conductance plateaus disappear and the spin conductance gets suppressed, confirming the spin-insulating character of a superfluid. Our observations document the breakdown of universal conductance quantization as many-body correlations appear. The observed anomalous quantization challenges a Fermi liquid description of the normal phase, shedding new light on the nature of the strongly attractive Fermi gas.

scholarly journals An in situ tunable radio-frequency quantum point contact

2010 ◽  
Vol 97 (20) ◽  
pp. 202104 ◽  
Author(s):  
T. Müller ◽  
B. Küng ◽  
S. Hellmüller ◽  
P. Studerus ◽  
K. Ensslin ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Point Contact ◽  
Quantum Point Contact ◽  
Quantum Point

Influence of a Quantum Point Contact as a Charge Detector on the Spin-Related Transport Through a Quantum Dot

2011 ◽  
Author(s):  
A. Inoue ◽  
M. Yamamoto ◽  
A. Oiwa ◽  
S. Tarucha ◽  
Jisoon Ihm ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Point Contact ◽  
Quantum Point Contact ◽  
Quantum Point ◽  
A Charge
Sign in / Sign up

Export Citation Format

Share Document