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Author |
Mineev, Vladimir P. |
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Title |
Superfluid helium: Order in disorder |
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2012 |
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Nature Physics |
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Nat. Phys. |
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8 |
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253–254 |
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fromIPMRAS |
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Confining liquid 3He in porous silica aerogel prepared with strong anisotropy stabilizes a state of axial superfluidity. |
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RPLAB @ gujma @ |
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810 |
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Author |
Clerk, Aashish |
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Title |
Quantum phononics: To see a SAW |
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Journal Article |
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2012 |
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Nature Physics |
Abbreviated Journal |
Nat. Phys. |
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8 |
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4 |
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256-257 |
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fromIPMRAS |
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Mechanical oscillations of microscopic resonators have recently been observed in the quantum regime. This idea could soon be extended from localized vibrations to travelling waves thanks to a sensitive probe of so-called surface acoustic waves. |
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RPLAB @ gujma @ |
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811 |
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Hollenberg, Lloyd C. L. |
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Title |
Quantum control: Through the quantum chicane |
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Journal Article |
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2012 |
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Nature Physics |
Abbreviated Journal |
Nat. Phys. |
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8 |
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2 |
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113-114 |
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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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Author |
Gustafsson, Martin V.; Santos, Paulo V.; Johansson, Göran; Delsing, Per |
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Title |
Local probing of propagating acoustic waves in a gigahertz echo chamber |
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Journal Article |
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2012 |
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Nature Physics |
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Nat. Phys. |
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8 |
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4 |
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338-343 |
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In the same way that micro-mechanical resonators resemble guitar strings and drums, surface acoustic waves resemble the sound these instruments produce, but moving over a solid surface rather than through air. In contrast with oscillations in suspended resonators, such propagating mechanical waves have not before been studied near the quantum mechanical limits. Here, we demonstrate local probing of surface acoustic waves with a displacement sensitivity of 30amRMSHz-1/2 and detection sensitivity on the single-phonon level after averaging, at a frequency of 932MHz. Our probe is a piezoelectrically coupled single-electron transistor, which is sufficiently fast, non-destructive and localized to enable us to track pulses echoing back and forth in a long acoustic cavity, self-interfering and ringing the cavity up and down. We project that strong coupling to quantum circuits will enable new experiments, and hybrids using the unique features of surface acoustic waves. Prospects include quantum investigations of phonon-phonon interactions, and acoustic coupling to superconducting qubits for which we present favourable estimates. |
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RPLAB @ gujma @ |
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813 |
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Korotkov, Alexander N. |
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Entanglement preservation: The Sleeping Beauty approach |
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2012 |
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Nature Physics |
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Nat. Phys. |
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8 |
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2 |
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107-108 |
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Two-qubit entanglement can be preserved by partially measuring the qubits to leave them in a 'lethargic' state. The original state is restored using quantum measurement reversal after the qubits have travelled through a decoherence channel. |
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RPLAB @ gujma @ |
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814 |
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