Amplifying stationary quantum discord and entanglement between a superconducting qubit and a data bus by time-dependent electromagnetic field

Qian, Yi; Zhang, Ye-Qi; Xu, Jing‐Bo

doi:10.1007/s11434-012-5112-4

Cited by 15 publications

(7 citation statements)

References 35 publications

(49 reference statements)

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“…It includes mainly quantum communication and quantum computation [1][2][3][4][5]. By far, many interesting quantum systems have been presented for quantum information processing, such as nuclear magnetic resonance [6,7], quantum dots [8][9][10][11][12][13], diamond nitrogen vacancy (NV) centers [14][15][16][17][18][19], photonic systems [20][21][22][23][24], circuit quantum electrodynamics (QED) [25][26][27][28][29][30][31][32][33][34][35], and so on. Due to the good scalability [36] and convenient operation on superconducting qubits, circuit QED has attracted much attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

Efficient generation of NOON states on two microwave-photon resonators

2014

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We present an efficient scheme for the generation of NOON states of photons in circuit QED assisted by a superconducting charge qutrit. It is completed with two kinds of manipulations, that is, the resonant operation on the qutrit and the resonator, and the single-qubit operation on the qutrit, and they both are high-fidelity operations. Compared with the one by a superconducting transmon qutrit proposed by Su et al. (Sci. Rep. 4, 3898 (2014)), our scheme does not require to maintain the qutrit in the third excited state with a long time, which relaxes the difficulty of its implementation in experiment. Moreover, the level anharmonicity of a charge qutrit is larger and it is better for us to tune the different transitions of the charge qutrit resonant to the resonator, which makes our scheme faster than others.Comment: 6 pages, 1 figur

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Section: Introductionmentioning

confidence: 99%

Efficient generation of NOON states on two microwave-photon resonators

2014

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“…A connection between QD consumption and the quantum advantage for encoding information has been identified as well [15]. These findings have prompted a huge surge of interest in understanding QD from different perspectives, such as its operational interpretation via quantum state merging [16,17] and teleportation fidelity [18], the generation of QD via local operations [19][20][21][22][23], the discording power of nonlocal unitary gates [24], and other related issues of QD [25][26][27][28][29]; see a recent review paper [30] for more results.…”

Section: Introductionmentioning

confidence: 99%

Role of Weak Measurements on States Ordering and Monogamy of Quantum Correlation

Fan

Tian

2014

Int J Theor Phys

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The information-theoretic definition of quantum correlation, e.g., quantum discord, is measurement dependent. By considering the more general quantum measurements, weak measurements, which include the projective measurement as a limiting case, we show that while weak measurements can enable one to capture more quantumness of correlation in a state, it can also induce other counterintuitive quantum effects. Specifically, we show that the general measurements with different strengths can impose different orderings for quantum correlations of some states. It can also modify the monogamous character for certain classes of states as well which may diminish the usefulness of quantum correlation as a resource in some protocols. In this sense, we say that the weak measurements play a dual role in defining quantum correlation.

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“…[1] It plays an essential role in various kinds of quantum information processing, including quantum state teleportation, [2] quantum cryptography, [3] quantum error correction, [4] quantum computational speed-up, [5] etc. Much attention has been paid to the study of entanglement, and the relation between entanglement and other measures of quantumness [6][7][8][9] is concerned lately. For an actual physical system, the fact that entanglement is fragile due to inevitable interaction between the system and its surrounding environment becomes the main limitation of achievement of quantum protocols.…”

Section: Introductionmentioning

confidence: 99%

Relation between initial conditions and entanglement sudden death for two-qubit extended Werner-like states

Yang¹,

Mao-Fa²,

Huang³

2013

Chinese Phys. B

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In this paper, the dynamical behavior of entanglement of an uncoupled two-qubit system, which interacts with independent identical amplitude damping environments and is initially prepared in the extended Werner-like (EWL) states, is investigated. The results show that whether entanglement sudden death (ESD) of an EWL state will occur or not depends on initial purity and concurrence. The boundaries between ESD states and ESD-free states for two kinds of EWL states are found to be different. Furthermore, some regions are shown where ESD states can be transformed into ESD-free states by local unitary operations.

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Amplifying stationary quantum discord and entanglement between a superconducting qubit and a data bus by time-dependent electromagnetic field

Cited by 15 publications

References 35 publications

Efficient generation of NOON states on two microwave-photon resonators

Efficient generation of NOON states on two microwave-photon resonators

Role of Weak Measurements on States Ordering and Monogamy of Quantum Correlation

Relation between initial conditions and entanglement sudden death for two-qubit extended Werner-like states

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