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Kumar, Sushil; Chan, Chun Wang I.; Hu, Qing; Reno, John L. |
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Title |
A 1.8-THz quantum cascade laser operating significantly above the temperature of hw/k |
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2011 |
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Nature Physics |
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7 |
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166-171 |
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QCL, 2 mW at 155 K and 1.8 THz |
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Several competing technologies continue to advance the field of terahertz science; of particular importance has been the development of a terahertz semiconductor quantum cascade laser (QCL), which is arguably the only solid-state terahertz source with average optical power levels of much greater than a milliwatt. Terahertz QCLs are required to be cryogenically cooled and improvement of their temperature performance is the single most important research goal in the field. Thus far, their maximum operating temperature has been empirically limited to ~planckω/kB, a largely inexplicable trend that has bred speculation that a room-temperature terahertz QCL may not be possible in materials used at present. Here, we argue that this behaviour is an indirect consequence of the resonant-tunnelling injection mechanism employed in all previously reported terahertz QCLs. We demonstrate a new scattering-assisted injection scheme to surpass this limit for a 1.8-THz QCL that operates up to ~1.9planckω/kB (163 K). Peak optical power in excess of 2 mW was detected from the laser at 155 K. This development should make QCL technology attractive for applications below 2 THz, and initiate new design strategies for realizing a room-temperature terahertz semiconductor laser. |
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631 |
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Author |
Shor, Peter W. |
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Title |
Quantum information theory: The bits don't add up |
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2009 |
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Nature Physics |
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Nat. Phys. |
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5 |
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247 - 248 |
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fromIPMRAS |
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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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Haviland, David |
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Title |
Superconducting circuits: Quantum phase slips |
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Journal Article |
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2010 |
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Nature Physics |
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Nat. Phys. |
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6 |
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565–566 |
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fromIPMRAS |
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Coulomb interactions can cause a rapid change in the phase of the wavefunction along a very narrow superconducting system. Such a phase slip at the quantum level is now measured in a chain of Josephson junctions. |
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807 |
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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 |
Barreiro, Julio T. |
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Title |
Quantum physics: Environmental effects controlled |
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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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927–928 |
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fromIPMRAS |
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An open quantum system loses its 'quantumness' when information about the state leaks into its surroundings. Researchers now show how this decoherence can be controlled between two incompatible regimes in the case of a single photon. |
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RPLAB @ gujma @ |
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817 |
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