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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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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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Error suppression in Hamiltonian-based quantum computation using energy penalties (2015)

Adam D. Bookatz, Edward Farhi, and Leo Zhou

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): Adam D. Bookatz, Edward Farhi, and Leo Zhou We consider the use of quantum error-detecting codes, together with energy penalties against leaving the code space, as a method for suppressing environmentally induced errors in Hamiltonian-based quantum computation. This method was introduced in Jordan et al. [ Phys. Rev. A 74 , 052322 (2006) ] in t… [Phys. Rev. A 92, 022317] Published Mon Aug 10, 2015

Keywords: Quantum information

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Polarization singularities in a sum-frequency light beam generated by a bichromatic singular beam in the bulk of an isotropic nonlinear chiral medium (2015)

K. S. Grigoriev, V. A. Makarov, and I. A. Perezhogin

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): K. S. Grigoriev, V. A. Makarov, and I. A. Perezhogin Expressions for the electric field at a sum frequency generated by a collinear elliptically polarized Gaussian beam and circularly polarized Laguerre-Gaussian beam in an isotropic chiral nonlinear medium are obtained in quadratures. The amount and locations of C points in the cross section of a sign… [Phys. Rev. A 92, 023814] Published Mon Aug 10, 2015

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Dynamical many-body phases of the parametrically driven, dissipative Dicke model (2015)

R. Chitra and O. Zilberberg

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-08-11

Description: Author(s): R. Chitra and O. Zilberberg Control and manipulation of quantum engineered systems allows for the utilization of time-dependent parametric modulations for accessing novel out-of-equilibrium phenomena. In the absence of such driving, the dissipative Dicke model exhibits a fascinating out-of-equilibrium many-body phase transitio… [Phys. Rev. A 92, 023815] Published Mon Aug 10, 2015

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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