Highly Efficient Processing of Multi-photon States

Lin, Qing; He, Bing

doi:10.1038/srep12792

Cited by 47 publications

(51 citation statements)

References 81 publications

(141 reference statements)

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“…20, the choices of the metal tube forming the sheath have been reduced to those elements or metals showing little or no reaction with pnictide during the final heat treatment. The use of various sheath materials has been attempted for fabricating metal-clad pnictide wires and tapes, such as Ag [ 201 , 202 ], Nb [ 193 , 203 ], Fe [204][205][206], and Cu [ 207,208 ]. Thus far, Ag has been observed to be the most appropriate sheath material for wire fabrication, showing little reaction with the superconducting phase at the optimized temperatures of the final thermal treatments.…”

Section: Fabrication Of Wires and Tapesmentioning

confidence: 99%

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Recent advances in iron-based superconductors toward applications

et al. 2018

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Iron with a large magnetic moment was widely believed to be harmful to the emergence of superconductivity because of the competition between the static ordering of electron spins and the dynamic formation of electron pairs (Cooper pairs). Thus, the discovery of a high critical temperature (Tc) iron-based superconductor (IBSC) in 2008 was accepted with surprise in the condensed matter community and rekindled extensive study globally. IBSCs have since grown to become a new class of high-Tc superconductors next to the high-Tc cuprates discovered in 1986. The rapid research progress in the science and technology of IBSCs over the past decade has resulted in the accumulation of a vast amount of knowledge on IBSC materials, mechanisms, properties, and applications with the publication of more than several tens of thousands of papers. This article reviews recent progress in the technical applications (bulk magnets, thin films, and wires) of IBSCs in addition to their fundamental material characteristics. Highlights of their applications include high-field bulk magnets workable at 15-25 K, thin films with high critical current density (Jc) > 1 MA/cm2 at ~10 T and 4 K, and an average Jc of 1.3*104 A/cm2 at 10 T and 4 K achieved for a 100-m-class-length wire. These achievements are based on the intrinsically advantageous properties of IBSCs such as the higher crystallographic symmetry of the superconducting phase, higher critical magnetic field, and larger critical grain boundary angle to maintain high Jc. These properties also make IBSCs promising for applications using high magnetic fields.Comment: Published online in Materials Today. Open Acces

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Section: Fabrication Of Wires and Tapesmentioning

confidence: 99%

“…Recently, Cu and Fe have also appeared as strong alternatives when the final heat treatment time is short [ 196 ]. Because Cu is less expensive and has better deformation properties than Ag, it remains an interesting alternative for industrial applications [ 208 ].…”

Section: Fabrication Of Wires and Tapesmentioning

confidence: 99%

Recent advances in iron-based superconductors toward applications

et al. 2018

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“…In Table , we compare the physical resources and the optical elements needed in three schemes with the present one. Based on the spatial and polarization degrees of freedom, the number of spatial paths of the target photon is 2 n in the former three schemes, while it is 2 in the present scheme with the help of the temporal degree of freedom.…”

Section: Discussion and Summarymentioning

confidence: 99%

“…Besides two‐photon quantum gates, some three‐photon quantum gates are also the reversible and universal logic gates for quantum computation, such as a Fredkin gate and a Toffoli gate . Assisted by strong and weak cross‐Kerr nonlinearities, the Fredkin gate and the Toffoli gate with high success probability can be constructed, where the spatial degree of freedom is applied to assist their construction. Relying on the assistance of the spatial degree of freedom, multiphoton polarization controlled logic gates attract much attention …”

Section: Introductionmentioning

confidence: 99%

Construction of a Polarization Multiphoton Controlled One‐Photon Unitary Gate Assisted by the Spatial and Temporal Degrees of Freedom

et al. 2019

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In order to fulfill quantum information processing tasks such as quantum computation and scalable quantum networks, quantum logic gates are indispensable parts. A multiqubit logic gate can efficiently reduce the cost of physical resources and complicated operations that are necessary in the combination of fewer-qubit (e.g., two-qubit) logic gates to fulfill the same tasks. However, the construction of multiphoton quantum logic gates is a large challenge. Assisted by spatial and temporal degrees of freedom, a polarization multiphoton controlled one-photon unitary gate is proposed, which can be realized with three processes including the control-path process based on weak cross-Kerr nonlinearities, the unitary transformation process, and the output process. In the control-path process, the control-path modules are applied, where the entanglement between polarization, spatial and temporal degrees of freedom is generated by beam splitters, time delayers, and nonlinear interaction in cross-Kerr media. The scheme presented here, assisted by spatial and temporal degrees of freedom reduces the experimental complexity of the schemes assisted by only spatial degree of freedom. Moreover, it will also be a useful reference in optimally constructing multiqubit quantum logic gates with other multiple degrees of freedom in many physical systems.variety of physical systems in the theoretical aspect [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and experimental aspect. [21][22][23][24][25][26] Photons are the promising carriers of quantum information due to their advantages, fast propagation, low decoherence, ease to manipulate, etc. [27] However, owing to weak photon-photon interaction, quantum logic gates at the single-photon level had made slow progress. [22] The linear optics standard model proposed by Knill et al. [28] had changed this unclear situation, while its upper limitation of success probability is less than unity. [29] Furthermore, by using nonlinear optical interaction such as cross-Kerr interaction, the threshold on the success probability imposed by the linear optics standard model could be broken through. [30] Due to tiny strength of nonlinear interaction, the direct applications of cross-Kerr nonlinearities have not been easily realized. To achieve feasibility of deterministic quantum logic gates, weak cross-Kerr nonlinearities were applied first in the two-photon controllednot gate using an auxiliary photon, [31] which approaches the success probability nearly close to unity. After that, many construction schemes of twophoton logic gates based on weak cross-Kerr nonlinearities were proposed, for instance, the controlled-not gate with half unity success probability without an auxiliary photon, [32] the controllednot gate, [33] and the controlled-phase gate [34] with nearly unity success probability without the auxiliary photon, quantum logic gates [35] composed by control-path gate and merging gate. On the other hand, weak cross-Kerr nonlinearities were also used in the Bell states analys...

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“…One can exactly obtain the information of photons in the Fock state but not destroy them by detecting the probe mode with a general homodyne-heterodyne measurement. The cross-Kerr nonlinearity between photons offers an ideal playground for quantum state engineering, and a number of applications have been studied, such as constructing nondestructive quantum nondemoliton detectors (QND)2627, deterministic entanglement distillation28, logic-qubit entanglement2930, generation of multi-photon entangled states and decoherence-free states24313233343536.…”

Section: Generations Of Four-qubit Entangled Decoherence-free Statesmentioning

confidence: 99%

Generation of four-photon polarization entangled decoherence-free states with cross-Kerr nonlinearity

Yan

Gao

2016

Sci Rep

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We propose a theoretical protocol for preparing four-photon polarization entangled decoherence-free states, which are immune to the collective noise. With the assistance of the cross-Kerr nonlinearities, a two-photon spatial entanglement gate, two controlled-NOT gates, a four-photon polarization entanglement gate are inserted into the circuit, where X homodyne measurements are aptly applied. Combined with some swap gates and simple linear optical elements, four-photon polarization entangled decoherence-free states which can be utilized to represent two logical qubits, |0〉L and |1〉L are achieved at the output ports of the circuit. This generation scheme may be implemented with current experimental techniques.

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Highly Efficient Processing of Multi-photon States

Cited by 47 publications

References 81 publications

Recent advances in iron-based superconductors toward applications

Recent advances in iron-based superconductors toward applications

Construction of a Polarization Multiphoton Controlled One‐Photon Unitary Gate Assisted by the Spatial and Temporal Degrees of Freedom

Generation of four-photon polarization entangled decoherence-free states with cross-Kerr nonlinearity

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