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| Author |
Shor, Peter W. |
Title  |
Quantum information theory: The bits don't add up |
Type |
Journal Article |
| Year |
2009 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
| Volume |
5 |
Issue |
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Pages |
247 - 248 |
| Keywords |
fromIPMRAS |
| Abstract |
A counterexample to the 'additivity question', the most celebrated open problem in the mathematical theory of quantum information, casts doubt on the possibility of finding a simple expression for the information capacity of a quantum channel. |
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RPLAB @ gujma @ |
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800 |
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| Author |
Home, Jonathan |
| Title |
Quantum entanglement: Watching correlations disappear |
Type |
Journal Article |
| Year |
2010 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
| Volume |
6 |
Issue |
12 |
Pages |
938-939 |
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fromIPMRAS |
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Engineered decoherence enables tracking of multipartite entanglement as a quantum state decays. |
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RPLAB @ gujma @ |
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832 |
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| Author |
Zurek, Wojciech Hubert |
| Title |
Quantum Darwinism |
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Journal Article |
| Year |
2009 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
| Volume |
5 |
Issue |
3 |
Pages |
181-188 |
| Keywords |
fromIPMRAS |
| Abstract |
Quantum Darwinism describes the proliferation, in the environment, of multiple records of selected states of a quantum system. It explains how the quantum fragility of a state of a single quantum system can lead to the classical robustness of states in their correlated multitude; shows how effective `wave-packet collapse' arises as a result of the proliferation throughout the environment of imprints of the state of the system; and provides a framework for the derivation of Born's rule, which relates the probabilities of detecting states to their amplitudes. Taken together, these three advances mark considerable progress towards settling the quantum measurement problem. |
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RPLAB @ gujma @ |
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799 |
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| Author |
Hollenberg, Lloyd C. L. |
| Title |
Quantum control: Through the quantum chicane |
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Journal Article |
| Year |
2012 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
| Volume |
8 |
Issue |
2 |
Pages |
113-114 |
| Keywords |
fromIPMRAS |
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In quantum control there is an inherent tension between high fidelity requirements and the need for speed to avoid decoherence. A direct comparison of quantum control protocols at these two extremes indicates where the sweet spot may lie. |
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RPLAB @ gujma @ |
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812 |
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Grinolds, M. S.; Maletinsky, P.; Hong, S.; Lukin, M. D.; Walsworth, R. L.; Yacoby, A. |
| Title |
Quantum control of proximal spins using nanoscale magnetic resonance imaging |
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Journal Article |
| Year |
2011 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
| Volume |
7 |
Issue |
9 |
Pages |
687-692 |
| Keywords |
fromIPMRAS |
| Abstract |
Quantum control of individual spins in condensed-matter systems is an emerging field with wide-ranging applications in spintronics, quantum computation and sensitive magnetometry. Recent experiments have demonstrated the ability to address and manipulate single electron spins through either optical or electrical techniques. However, it is a challenge to extend individual-spin control to nanometre-scale multi-electron systems, as individual spins are often irresolvable with existing methods. Here we demonstrate that coherent individual-spin control can be achieved with few- nanometre resolution for proximal electron spins by carrying out single-spin magnetic resonance imaging (MRI), which is realized using a scanning-magnetic-field gradient that is both strong enough to achieve nanometre spatial resolution and sufficiently stable for coherent spin manipulations. We apply this scanning-field-gradient MRI technique to electronic spins in nitrogen-vacancy (NV) centres in diamond and achieve nanometre resolution in imaging, characterization and manipulation of individual spins. For NV centres, our results in individual-spin control demonstrate an improvement of nearly two orders of magnitude in spatial resolution when compared with conventional optical diffraction-limited techniques. This scanning-field-gradient microscope enables a wide range of applications including materials characterization, spin entanglement and nanoscale magnetometry. |
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RPLAB @ gujma @ |
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827 |
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