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M. Fuechsle, S. Mahapatra, F.A. Zwanenburg,
M. Friesen, M.A. Eriksson and M.Y. Simmons
, "Spectroscopy of few-electron single-crystal
silicon quantum dots", Nature Nanotechnology, published online 23 May2010 Abstract

Tiny Dot Speeds Hi-Tech Future
Sydney Morning Hearld, 24 May 2010

Scientists have created a transistor in a computer chip that is 10 times smaller than those commonly in use now, marking the start of a new age of super-fast, super-powerful computing. Article

Seven Atom Transistor sets the Pace for Future PCs
BBC News, 24 May 2010

Researchers have shown off a transistor made from just seven atoms that could be used to create smaller, more powerful computers. Article

Image: Blackwood/Getty

Quantum Leap: World's Smallest Transistor Built with Just 7 Atoms
Nanotechnology, 24 May 2010

Scientists have literally taken a leap into a new era of computing power by making the world's smallest precision-built transistor - a "quantum dot" of just seven atoms in a single silicon crystal. Despite its incredibly tiny size - a mere four billionths of a metre long - the quantum dot is a functioning electronic device, the world's first created deliberately by placing individual atoms. Article

Heralded Noiseless Linear Amplification & Distillation of Entanglement
Nature Photonics, 28 March 2010

CQCT researchers have developed a heralded scheme for avoiding the quantum noise that usually results from amplifying an optical signal. The heralded nature of the device makes it possible to readily isolate successful noiseless amplification from failed attempts. The noiseless amplifier wasused in a demonstration of field-mode entanglement
distillation, highlighting the fact that application to quantum technology protocols such as continuous-variables quantum key distribution and other quantum photonic technologies will be possible in the near future.

G.Y. Xiang, T.C. Ralph, A.P. Lund, N. Walk &
G.J. Pryde
, "Heralded noiseless linear amplification and distillation of entanglement", Nature Photonics 4, 316 (2010). Abstract

New Quantum Computing Director Appointed
UNSW Faculty of Science, 21 May 2010

UNSW is pleased to announce the appointment of Professor Michelle Simmons as Director of one of the university's largest and most high-profile research initiatives - the Centre for Quantum Computer Technology (CQCT). Article

Surface Code Quantum Communication
Physical Review Letters, 7 May 2010

Quantum communication typically involves a linear chain of repeater stations, each capable of reliable local quantum computation and connected to their nearest neighbors by unreliable communication links. The communication rate of existing protocols is low as two-way classical communication is used. By using a surface code across the repeater chain and generating Bell pairs between neighboring stations with probability of heralded success greater than 0.65 and fidelity greater than 0.96, we show that two-way communication can be avoided and quantum information can be sent over arbitrary distances with arbitrarily low error at a rate limited only by the local gate speed.

A.G. Fowler, AG, D.S. Wang, C.D. Hill, T.D. Ladd,
R. Van Meter and L.C.L. Hollenberg,
"Surface Code Quantum Communication", Physical Review Letters
104,180503 (2010). Abstract

A Smoother Quantum Measurement
American Physical Society -
Spotlighting Exceptional Research, 3 March 2010

The precision of any measurement is fundamentally limited by the standard quantum limit. Often there are classical quantities related to the dynamical evolution of a quantum system one would like to measure, a process known as quantum parameter estimation. This kind of estimation is useful in delicate measurements ranging from gravitational wave detection to quantum computation. Recently, Tsang [1] considered the case of quantum estimation for dynamical systems and proposed a method called quantum smoothing that combines past observations with “future” measurements (that is, a signal is inferred from measurements both before and after a chosen point in time). Article

T.A. Wheatley, D.W. Berry, H. Yonezawa, D.Nakane, H. Arao, D.T. Pope, T.C. Ralph,
H.M. Wiseman, A. Furusawa, and E.H. Huntington,
"Adaptive Optical Phase Estimation Using Time-Symmetric Quantum Smoothing", Physical Review Letters 104, 093601 (2010). Abstract

Towards Quantum Chemistry on a Quantum Computer
Nature Chemistry, 10 January 2010

This paper reports on the application of the latest photonic quantum computer technology to calculate properties of the smallest molecular system: the hydrogen molecule. We calculate the complete energy spectrum to 20 bits of precision and discuss how the technique can be expanded to solve large-scale chemical problems that lie beyond the reach of modern supercomputers.

B.P. Lanyon, J.D. Whitfield, G.G. Gillett, M.E. Goggin, M.P. Almeida, I. Kassal, J.D. Biamonte, M. Mohseni, B.J. Powell, M. Barbieri, A. Aspuru-Guzik & A.G. White, "Towards quantum chemistry on a quantum computer", Nature Chemistry 2, 106 (2010). Abstract

Applied Physics Letters Cover
16 December 2009

W.H. Lim, F.A. Zwanenburg, H. Huebl, M. Mottonen, K.W. Chan, A. Morello and A.S. Dzurak, “Observation of the single-electron regime in a highly tunable silicon quantum dot”, Applied Physics Letters 95, 242102 (2009). Abstract



Single-Atom Transistor Discovered
Nanotechnology Now, 3 December 2009

Researchers from Helsinki University of Technology (Finland), University of New South Wales (Australia), and University of Melbourne (Australia) have succeeded in building a working transistor, whose active region composes only of a single phosphorus atom in silicon. The results have just been published in Nano Letters. Article




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