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| Author |
Buchanan, Mark |
| Title |
Nothing's impossible |
Type |
Manuscript |
| Year |
2011 |
Publication |
Nature Physics |
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Nat. Phys. |
| Volume |
7 |
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Pages |
5 |
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fromIPMRAS |
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no |
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RPLAB @ gujma @ |
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839 |
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| Author |
Lupascu, Adrian |
| Title |
Nonlinear dynamics: Quantum pendula locked in |
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Journal Article |
| Year |
2011 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
| Volume |
7 |
Issue |
2 |
Pages |
100-101 |
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fromIPMRAS |
| Abstract |
A study of the autoresonant behaviour of a superconducting pendulum reveals that quantum fluctuations determine only the initial oscillator motion and not its subsequent dynamics. This could be important in the development of more efficient methods for reading solid-state qubits. |
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RPLAB @ gujma @ |
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840 |
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Nevou, L.; Liverini, V.; Friedli, P.; Castellano, F.; Bismuto, A.; Sigg, H.; Gramm, F.; Müller, E.; Faist, J. |
| Title |
Current quantization in an optically driven electron pump based on self-assembled quantum dots |
Type |
Journal Article |
| Year |
2011 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
| Volume |
7 |
Issue |
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Pages |
423–427 |
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fromIPMRAS |
| Abstract |
The electronic structure of self-assembled semiconductor quantum dots consists of discrete atom-like states that can be populated with a well-defined number of electrons. This property can be used to fabricate a d.c. current standard that enables the unit of ampere to be independently defined. Here we report an optically pumped current source based on self-assembled InAs/GaAs quantum dots. The accuracy obtained so far is 10–1 and is limited by the uncertainty in the number of dots. At 10 K the device generates a current difference of 2.39 nA at a frequency of 1 kHz. The accuracy could be improved by site-selective growth techniques where the number of dots is fixed by pre-patterning. The results are promising for applications in electrical metrology, where a current standard is needed to close the so-called quantum metrological triangle. |
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no |
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RPLAB @ gujma @ |
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841 |
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| Author |
Ma, Xiao-Song; Dakic, Borivoje; Naylor, William; Zeilinger, Anton; Walther, Philip |
| Title |
Quantum simulation of the wavefunction to probe frustrated Heisenberg spin systems |
Type |
Journal Article |
| Year |
2011 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
| Volume |
7 |
Issue |
5 |
Pages |
399-405 |
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fromIPMRAS |
| Abstract |
Quantum simulators are controllable quantum systems that can reproduce the dynamics of the system of interest in situations that are not amenable to classical computers. Recent developments in quantum technology enable the precise control of individual quantum particles as required for studying complex quantum systems. In particular, quantum simulators capable of simulating frustrated Heisenberg spin systems provide platforms for understanding exotic matter such as high-temperature superconductors. Here we report the analogue quantum simulation of the ground-state wavefunction to probe arbitrary Heisenberg-type interactions among four spin-1/2 particles. Depending on the interaction strength, frustration within the system emerges such that the ground state evolves from a localized to a resonating-valence-bond state. This spin-1/2 tetramer is created using the polarization states of four photons. The single-particle addressability and tunable measurement-induced interactions provide us with insights into entanglement dynamics among individual particles. We directly extract ground-state energies and pairwise quantum correlations to observe the monogamy of entanglement. |
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no |
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RPLAB @ gujma @ |
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842 |
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| Author |
Brida, G.; Genovese, M.; Ruo Berchera, I. |
| Title |
Experimental realization of sub-shot-noise quantum imaging |
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Journal Article |
| Year |
2010 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
| Volume |
4 |
Issue |
4 |
Pages |
227-230 |
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fromIPMRAS |
| Abstract |
The properties of quantum states have led to the development of new technologies, ranging from quantum information to quantum metrology. A recent field of research to emerge is quantum imaging, which aims to overcome the limits of classical imaging by making use of the spatial properties of quantum states of light . In particular, quantum correlations between twin beams represent a fundamental resource for these studies. One of the most interesting proposed schemes takes advantage of the spatial quantum correlations between parametric down-conversion light beams to realize sub-shot-noise imaging of weak absorbing objects, leading ideally to noise-free imaging. Here, we present the first experimental realization of this scheme, showing its potential to achieve a larger signal-to-noise ratio than classical imaging methods. This work represents the starting point for this quantum technology, which we anticipate will have applications when there is a requirement for low-photon-flux illumination (for example for use with biological samples). |
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no |
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RPLAB @ gujma @ |
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771 |
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| Author |
Kok, Pieter |
| Title |
Quantum optics: Entangled photons report for duty |
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Journal Article |
| Year |
2010 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
| Volume |
4 |
Issue |
8 |
Pages |
504-505 |
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fromIPMRAS |
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Entangled photons are a key ingredient in optical quantum technologies, but researchers have so far been unable to produce a single pair of entangled photons. Now, two groups from China and Austria independently report just that, with a technique that avoids the need to infer entanglement from detection signatures. |
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no |
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RPLAB @ gujma @ |
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772 |
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| Author |
Kono, Junichiro |
| Title |
Coherent terahertz control |
Type |
Journal Article |
| Year |
2011 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
| Volume |
5 |
Issue |
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Pages |
5-6 |
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fromIPMRAS |
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Spin and charge terahertz excitations in solids are promising for implementing future technologies such as spintronics and quantum computation, but coherently controlling them has been a significant challenge. Researchers have now manipulated coherent spin waves in an antiferromagnet using the intense magnetic field of ultrashort terahertz pulses. |
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no |
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RPLAB @ gujma @ |
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773 |
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| Author |
Paiella, Roberto |
| Title |
Terahertz quantum cascade lasers: Going ultrafast |
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Journal Article |
| Year |
2011 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
| Volume |
5 |
Issue |
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Pages |
253–255 |
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fromIPMRAS |
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A new asynchronous coherent optical sampling method allows for the direct visualization of actively mode-locked quantum cascade laser pulses at terahertz wavelengths. |
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no |
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RPLAB @ gujma @ |
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774 |
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| Author |
Fazal, Furqan M.; Block, Steven M. |
| Title |
Optical tweezers study life under tension |
Type |
Journal Article |
| Year |
2011 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
| Volume |
5 |
Issue |
6 |
Pages |
318-321 |
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fromIPMRAS |
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Optical tweezers have become one of the primary weapons in the arsenal of biophysicists, and have revolutionized the new field of single-molecule biophysics. Today's techniques allow high-resolution experiments on biological macromolecules that were mere pipe dreams only a decade ago. |
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no |
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RPLAB @ gujma @ |
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776 |
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| Author |
Gabay, Marc; Triscone, Jean-Marc |
| Title |
Superconductors: Terahertz superconducting switch |
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Journal Article |
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2011 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
| Volume |
5 |
Issue |
8 |
Pages |
447-449 |
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fromIPMRAS |
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The use of terahertz pulses to 'gate' interlayer charge transport in a superconductor could lead to a variety of new and interesting applications. |
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no |
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RPLAB @ gujma @ |
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777 |
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| Author |
Capmany, José; Gasulla, Ivana; Sales, Salvador |
| Title |
Microwave photonics: Harnessing slow light |
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Journal Article |
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2011 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
| Volume |
5 |
Issue |
12 |
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731-733 |
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fromIPMRAS |
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Slow-light techniques originally conceived for buffering high-speed digital optical signals now look set to play an important role in providing broadband phase and true time delays for microwave signals. |
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RPLAB @ gujma @ |
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778 |
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Gao, Jie; McMillan, James F.; Wong, Chee Wei |
| Title |
Nanophotonics: Remote on-chip coupling |
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Journal Article |
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2012 |
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Nature Photonics |
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Nat. Photon. |
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6 |
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1 |
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7-8 |
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Scientists have demonstrated strongly coupled photon states between two distant high-Q photonic crystal cavities connected by a photonic crystal waveguide. Remote dynamic control over the coupled states could aid the development of delay lines, optical buffers and qubit operations in both classical and quantum information processing. |
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779 |
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Pile, David |
| Title |
How many bits can a photon carry |
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Journal Article |
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2012 |
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Nature Photonics |
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Nat. Photon. |
| Volume |
6 |
Issue |
1 |
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14-15 |
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fromIPMRAS |
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Quantum physics offers a way to enhance the amount of information a photon can carry, with potential applications in optical communication, lithography, metrology and imaging. |
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View from... OSA Frontiers in Optics 2011: How many bits can a photon carry? |
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RPLAB @ gujma @ |
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780 |
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Santori, Charles; Beausoleil, Raymond G. |
| Title |
Quantum memory: Phonons in diamond crystals |
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Journal Article |
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2012 |
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Nature Photonics |
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Nat. Photon. |
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6 |
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10-12 |
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fromIPMRAS |
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The demonstration that quantum information can be stored in a bulk-diamond crystal in the form of an optically excited phonon gives researchers a new type of mechanical solid-state quantum memory to explore. |
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RPLAB @ gujma @ |
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781 |
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| Author |
Xu, XinAn; Wong, Chee Wei |
| Title |
Quantum optics: Correlations on a chip |
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Journal Article |
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2012 |
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Nature Photonics |
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Nat. Photon. |
| Volume |
6 |
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75-76 |
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fromIPMRAS |
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Researchers have developed a semiconductor structure capable of supporting quantum correlations between photons and strong single-photon nonlinearities, thus paving the way for the development of chip-based devices for quantum secure communications and quantum information processing. |
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782 |
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