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Mineev, Vladimir P. |
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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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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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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 |
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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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811 |
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Mariantoni, Matteo; Wang, H.; Bialczak, Radoslaw C.; Lenander, M.; Lucero, Erik; Neeley, M.; O'Connell, A. D.; Sank, D.; Weides, M.; Wenner, J.; Yamamoto, T.; Yin, Y.; Zhao, J.; Martinis, John M.; Cleland, A. N. |
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Title |
Photon shell game in three-resonator circuit quantum electrodynamics |
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Journal Article |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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4 |
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287-293 |
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fromIPMRAS |
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The generation and control of quantum states of light constitute fundamental tasks in cavity quantum electrodynamics (QED). The superconducting realization of cavity QED, circuit QED (refs 11, 12, 13, 14), enables on-chip microwave photonics, where superconducting qubits control and measure individual photon states. A long-standing issue in cavity QED is the coherent transfer of photons between two or more resonators. Here, we use circuit QED to implement a three-resonator architecture on a single chip, where the resonators are interconnected by two superconducting phase qubits. We use this circuit to shuffle one- and two-photon Fock states between the three resonators, and demonstrate qubit-mediated vacuum Rabi swaps between two resonators. By shuffling superposition states we are also able to demonstrate the high-fidelity phase coherence of the transfer. Our results illustrate the potential for using multi-resonator circuits as photon quantum registers and for creating multipartite entanglement between delocalized bosonic modes. |
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838 |
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Gustafsson, Martin V.; Santos, Paulo V.; Johansson, Göran; Delsing, Per |
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Local probing of propagating acoustic waves in a gigahertz echo chamber |
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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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813 |
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Baumert, Thomas |
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Quantum technology: Wave packets get a kick |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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5 |
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373-374 |
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Intense femtosecond pulses of infrared light can manipulate molecules. It is now shown that such control even extends to making different molecular eigenstates interfere with each other in a way never considered before -- a potential tool for optically engineered chemical reactions and for ultrafast information encoding and manipulation. |
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830 |
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