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Algebraic metrology: Nonoptimal but pretty good states and bounds (2015)

Michael Skotiniotis, Florian Fröwis, Wolfgang Dür, and Barbara Kraus

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): Michael Skotiniotis, Florian Fröwis, Wolfgang Dür, and Barbara Kraus We investigate quantum metrology using a Lie algebraic approach for a class of Hamiltonians, including local and nearest-neighbor interaction Hamiltonians. Using this Lie algebraic formulation, we identify and construct highly symmetric states that admit Heisenberg scaling in precision for phase est… [Phys. Rev. A 92, 022323] Published Mon Aug 10, 2015

Keywords: Quantum information

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Electronic ISSN: 1094-1622

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Relation between the Greenberger-Horne-Zeilinger–entanglement cost of preparing a multipartite pure state and its quantum discord (2015)

Seungho Yang and Hyunseok Jeong

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): Seungho Yang and Hyunseok Jeong We investigate how much amount of Greenberger-Horne-Zeilinger (GHZ) entanglement is required in order to prepare a given multipartite state by local operations and classical communication (LOCC). We present a LOCC procedure that asymptotically converts GHZ states into an arbitrary multipartite pure … [Phys. Rev. A 92, 022322] Published Mon Aug 10, 2015

Keywords: Quantum information

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Universal holonomic quantum gates in decoherence-free subspace on superconducting circuits (2015)

Zheng-Yuan Xue, Jian Zhou, and Z. D. Wang

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): Zheng-Yuan Xue, Jian Zhou, and Z. D. Wang To implement a set of universal quantum logic gates based on non-Abelian geometric phases, it is conventional wisdom that quantum systems beyond two levels are required, which is extremely difficult to fulfill for superconducting qubits and appears to be a main reason why only single-qubit gates wer… [Phys. Rev. A 92, 022320] Published Mon Aug 10, 2015

Keywords: Quantum information

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High-fidelity readout scheme for rare-earth solid-state quantum computing (2015)

A. Walther, L. Rippe, Y. Yan, J. Karlsson, D. Serrano, A. N. Nilsson, S. Bengtsson, and S. Kröll

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): A. Walther, L. Rippe, Y. Yan, J. Karlsson, D. Serrano, A. N. Nilsson, S. Bengtsson, and S. Kröll We propose and analyze a high-fidelity readout scheme for a single-instance approach to quantum computing in rare-earth-ion-doped crystals. The scheme is based on using different elements as qubit and readout ions, where the readout ions are doped into the material at a much lower concentration than… [Phys. Rev. A 92, 022319] Published Mon Aug 10, 2015

Keywords: Quantum information

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Real-time imaging of spin-to-orbital angular momentum hybrid remote state preparation (2015)

Manuel Erhard, Hammam Qassim, Harjaspreet Mand, Ebrahim Karimi, and Robert W. Boyd

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): Manuel Erhard, Hammam Qassim, Harjaspreet Mand, Ebrahim Karimi, and Robert W. Boyd There exists two prominent methods to transfer information between two spatially separated parties, namely Alice ( A ) and Bob ( B ): quantum teleportation and remote state preparation. However, the difference between these methods is, in the teleportation scheme, the state to be transferred is complete… [Phys. Rev. A 92, 022321] Published Mon Aug 10, 2015

Keywords: Quantum information

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Optimal encoding capacity of a linear optical quantum channel (2015)

J. A. Smith, D. B. Uskov, and L. Kaplan

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): J. A. Smith, D. B. Uskov, and L. Kaplan Here, we study the classical information capacity of a quantum channel, assuming linear optical encoding, as a function of available photons and optical modes. We present a formula for general channel capacity and show that this capacity is achieved without requiring the use of entangling operations… [Phys. Rev. A 92, 022324] Published Mon Aug 10, 2015

Keywords: Quantum information

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Light-induced structures in attosecond transient-absorption spectroscopy of molecules (2015)

Jens E. Bækhøj and Lars Bojer Madsen

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): Jens E. Bækhøj and Lars Bojer Madsen The nature of light-induced structures in attosecond transient-absorption spectroscopy of molecular systems is investigated theoretically. It is shown how nuclear dynamics affect these structures. We find that a theoretical three-surface model captures the main characteristics in the calculated spec… [Phys. Rev. A 92, 023407] Published Mon Aug 10, 2015

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Scaling laws for high-order-harmonic generation with midinfrared laser pulses (2015)

M. V. Frolov, N. L. Manakov, Wei-Hao Xiong, Liang-You Peng, J. Burgdörfer, and Anthony F. Starace

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): M. V. Frolov, N. L. Manakov, Wei-Hao Xiong, Liang-You Peng, J. Burgdörfer, and Anthony F. Starace We derive an analytic expression for the wavelength scaling of the high-order-harmonic generation (HHG) yield induced by midinfrared driving laser fields. It is based on a quasiclassical description of the returning electron wave packet, which is shown to be largely independent of atomic properties.… [Phys. Rev. A 92, 023409] Published Mon Aug 10, 2015

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Extracting an electron's angle of return from shifted interference patterns in macroscopic high-order-harmonic spectra of diatomic molecules (2015)

T. Das, B. B. Augstein, C. Figueira de Morisson Faria, L. E. Chipperfield, D. J. Hoffmann, and J. P. Marangos

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): T. Das, B. B. Augstein, C. Figueira de Morisson Faria, L. E. Chipperfield, D. J. Hoffmann, and J. P. Marangos We investigate high-order-harmonic spectra from aligned diatomic molecules in intense driving fields whose components have orthogonal polarizations. We focus on how the driving-field ellipticity influences structural interference patterns in a macroscopic medium. In a previous publication [ Phys. Rev… [Phys. Rev. A 92, 023406] Published Mon Aug 10, 2015

Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses

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Suppressing systematic control errors to high orders (2015)

P. Bažant, H. Frydrych, G. Alber, and I. Jex

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): P. Bažant, H. Frydrych, G. Alber, and I. Jex Dynamical decoupling is a powerful method for protecting quantum information against unwanted interactions with the help of open-loop control pulses. Realistic control pulses are not ideal and may introduce additional systematic errors. We introduce a class of self-stabilizing pulse sequences capabl… [Phys. Rev. A 92, 022325] Published Mon Aug 10, 2015

Keywords: Quantum information

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