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Author |
Akalin, Tahsin |
Title |
Terahertz sources: Powerful photomixers |
Type |
Journal Article |
Year |
2012 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
6 |
Issue |
2 |
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81 |
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fromIPMRAS |
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An efficient continuous-wave source of terahertz radiation that combines the outputs from two near-infrared semiconductor lasers in a novel photomixer looks set to benefit applications in spectroscopy and imaging. |
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RPLAB @ gujma @ |
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787 |
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Author |
Xu, XinAn; Wong, Chee Wei |
Title |
Quantum optics: Correlations on a chip |
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Journal Article |
Year |
2012 |
Publication |
Nature Photonics |
Abbreviated Journal |
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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RPLAB @ gujma @ |
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782 |
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Zhu, J.; Christensen, J.; Jung, J.; Martin-Moreno, L.; Yin, X.; Fok, L.; Zhang, X.; Garcia-Vidal, F. J. |
Title |
A holey-structured metamaterial for acoustic deep-subwavelength imaging |
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Journal Article |
Year |
2011 |
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Nature Physics |
Abbreviated Journal |
Nat. Phys. |
Volume |
7 |
Issue |
1 |
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52-55 |
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fromIPMRAS |
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For classical waves such as light or sound, diffraction sets a natural limit on how finely the details of an object can be recorded on its image. Recently, various optical superlenses based on the metamaterials concept have shown the possibility of overcoming the diffraction limit. Similar two-dimensional (2D) acoustic hyperlens designs have also been explored. Here we demonstrate a 3D holey-structured metamaterial that achieves acoustic imaging down to a feature size of λ/50. The evanescent field components of a subwavelength object are efficiently transmitted through the structure as a result of their strong coupling with Fabry-Pérot resonances inside the holey plate. This capability of acoustic imaging at a very deep-subwavelength scale may open the door for a broad range of applications, including medical ultrasonography, underwater sonar and ultrasonic non-destructive evaluation. |
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RPLAB @ gujma @ |
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809 |
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Author |
Pile, David |
Title |
How many bits can a photon carry |
Type |
Journal Article |
Year |
2012 |
Publication |
Nature Photonics |
Abbreviated Journal |
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 @ |
Serial |
780 |
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Hanneke, D.; Home, J. P.; Jost, J. D.; Amini, J. M.; Leibfried, D.; Wineland, D. J. |
Title |
Realization of a programmable two-qubit quantum processor |
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Journal Article |
Year |
2010 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
Volume |
6 |
Issue |
1 |
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13-16 |
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fromIPMRAS |
Abstract |
The universal quantum computer is a device capable of simulating any physical system and represents a major goal for the field of quantum information science. In the context of quantum information, `universal' refers to the ability to carry out arbitrary unitary transformations in the system's computational space. Combining arbitrary single-quantum-bit (qubit) gates with an entangling two-qubit gate provides a set of gates capable of achieving universal control of any number of qubits, provided that these gates can be carried out repeatedly and between arbitrary pairs of qubits. Although gate sets have been demonstrated in several technologies, they have so far been tailored towards specific tasks, forming a small subset of all unitary operators. Here we demonstrate a quantum processor that can be programmed with 15 classical inputs to realize arbitrary unitary transformations on two qubits, which are stored in trapped atomic ions. Using quantum state and process tomography, we characterize the fidelity of our implementation for 160 randomly chosen operations. This universal control is equivalent to simulating any pairwise interaction between spin-1/2 systems. A programmable multiqubit register could form a core component of a large-scale quantum processor, and the methods used here are suitable for such a device. |
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RPLAB @ gujma @ |
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801 |
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Author |
Santori, Charles; Beausoleil, Raymond G. |
Title |
Quantum memory: Phonons in diamond crystals |
Type |
Journal Article |
Year |
2012 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
6 |
Issue |
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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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Berlín, Guido; Brassard, Gilles; Bussières, Félix; Godbout, Nicolas; Slater, Joshua A.; Tittel, Wolfgang |
Title |
Experimental loss-tolerant quantum coin flipping |
Type |
Journal Article |
Year |
2011 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
Volume |
2 |
Issue |
561 |
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7 |
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fromIPMRAS |
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Coin flipping is a cryptographic primitive in which two distrustful parties wish to generate a random bit to choose between two alternatives. This task is impossible to realize when it relies solely on the asynchronous exchange of classical bits: one dishonest player has complete control over the final outcome. It is only when coin flipping is supplemented with quantum communication that this problem can be alleviated, although partial bias remains. Unfortunately, practical systems are subject to loss of quantum data, which allows a cheater to force a bias that is complete or arbitrarily close to complete in all previous protocols and implementations. Here we report on the first experimental demonstration of a quantum coin-flipping protocol for which loss cannot be exploited to cheat better. By eliminating the problem of loss, which is unavoidable in any realistic setting, quantum coin flipping takes a significant step towards real-world applications of quantum communication. |
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RPLAB @ gujma @ |
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766 |
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Author |
Gao, Jie; McMillan, James F.; Wong, Chee Wei |
Title |
Nanophotonics: Remote on-chip coupling |
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Journal Article |
Year |
2012 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
6 |
Issue |
1 |
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7-8 |
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fromIPMRAS |
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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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RPLAB @ gujma @ |
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779 |
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Peruzzo, Alberto; Laing, Anthony; Politi, Alberto; Rudolph, Terry; O'Brien, Jeremy L. |
Title |
Multimode quantum interference of photons in multiport integrated devices |
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Journal Article |
Year |
2011 |
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Nature Communications |
Abbreviated Journal |
Nat. Comm. |
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2 |
Issue |
224 |
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6 |
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fromIPMRAS |
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Photonics is a leading approach in realizing future quantum technologies and recently, optical waveguide circuits on silicon chips have demonstrated high levels of miniaturization and performance. Multimode interference (MMI) devices promise a straightforward implementation of compact and robust multiport circuits. Here, we show quantum interference in a 2×2 MMI coupler with visibility of V=95.6+/-0.9%. We further demonstrate the operation of a 4×4 port MMI device with photon pairs, which exhibits complex quantum interference behaviour. We have developed a new technique to fully characterize such multiport devices, which removes the need for phase-sensitive measurements and may find applications for a wide range of photonic devices. Our results show that MMI devices can operate in the quantum regime with high fidelity and promise substantial simplification and concatenation of photonic quantum circuits. |
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RPLAB @ gujma @ |
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763 |
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Crespi, Andrea; Ramponi, Roberta; Osellame, Roberto; Sansoni, Linda; Bongioanni, Irene; Sciarrino, Fabio; Vallone, Giuseppe; Mataloni, Paolo |
Title |
Integrated photonic quantum gates for polarization qubits |
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Journal Article |
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2011 |
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Nature Communications |
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Nat. Comm. |
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2 |
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566 |
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6 |
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fromIPMRAS |
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The ability to manipulate quantum states of light by integrated devices may open new perspectives both for fundamental tests of quantum mechanics and for novel technological applications. However, the technology for handling polarization-encoded qubits, the most commonly adopted approach, is still missing in quantum optical circuits. Here we demonstrate the first integrated photonic controlled-NOT (CNOT) gate for polarization-encoded qubits. This result has been enabled by the integration, based on femtosecond laser waveguide writing, of partially polarizing beam splitters on a glass chip. We characterize the logical truth table of the quantum gate demonstrating its high fidelity to the expected one. In addition, we show the ability of this gate to transform separable states into entangled ones and vice versa. Finally, the full accessibility of our device is exploited to carry out a complete characterization of the CNOT gate through a quantum process tomography. |
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RPLAB @ gujma @ |
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765 |
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