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Three qubits in less than three baths: Beyond two-body system-bath interactions in quantum refrigerators

#1Ahana Ghoshal (HRI: Harish-Chandra Research Institute)H-Index: 3

#2Sreetama Das (HRI: Harish-Chandra Research Institute)H-Index: 6

Last. Ujjwal Sen (HRI: Harish-Chandra Research Institute)H-Index: 26

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#1Paul Kairys (UT: University of Tennessee)H-Index: 3

#2Travis S. Humble (UT: University of Tennessee)H-Index: 22

#2Stephan Fritzsche (FSU: University of Jena)H-Index: 37

We investigate the delocalization of quantum information in the nonequilibrium dynamics of the XYspin chain with asymptotically decaying interactions \sim 1/r^{\alpha} As a figure of merit, we employ the tripartite mutual information (TMI), whose sign indicates if quantum information is predominantly shared globally. Interestingly, the sign of the TMI distinguishes regimes of the exponent \alphathat are known for different behaviour of information propagation. While an effective causal ...

Requirements for fault-tolerant quantum computation with cavity-QED-based atom-atom gates mediated by a photon with a finite pulse length

#1Rui Asaoka (NTT: Nippon Telegraph and Telephone)

#2Yuuki TokunagaH-Index: 9

Last. Takao AokiH-Index: 30

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We analyze the requirements for fault-tolerant quantum computation with atom-atom gates based on cavity quantum electrodynamics (cQED) mediated by a photon with a finite pulse length. For short photon pulses, the distorted shape of the reflected pulses from the cQED system is a serious error source. We optimize the cQED system parameters to minimize the infidelity due to the shape distortion and the photon losses in a well-balanced manner for the fault-tolerant scheme using probabilistic gates [...

#1Michal DobrskiH-Index: 4

#2Maciej PrzanowskiH-Index: 12

Last. Francisco J. TurrubiatesH-Index: 6

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#1N. Yu. KuznetsovH-Index: 2

#2K. S. GrigorievH-Index: 6

Last. Vladimir A MakarovH-Index: 17

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#1D. D'Ambrosio (Olivetti)H-Index: 2

#2Xavier Zambrana-Puyalto (IIT: Istituto Italiano di Tecnologia)H-Index: 17

Last. G. Gagliardi (Olivetti)H-Index: 151

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#1Debasis MondalH-Index: 5

#2Jaskaran SinghH-Index: 4

Last. Dagomir KaszlikowskiH-Index: 25

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#1Neetik Mukherjee (IISER-K: Indian Institute of Science Education and Research, Kolkata)H-Index: 8

#2Amlan K. Roy (IISER-K: Indian Institute of Science Education and Research, Kolkata)H-Index: 22

#1Jorge Villavicencio (UABC: Autonomous University of Baja California)H-Index: 13

#2Ernesto Cota (UNAM: National Autonomous University of Mexico)H-Index: 10

Last. D. Morachis Galindo (UNAM: National Autonomous University of Mexico)

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We study the geometric Uhlmann phase of entangled mixed states in a composite system made of two coupled spin-\frac 1 2particles with a magnetic field acting on one of them. Within a depolarizing channel setup, an exact analytical expression for such a phase in each subsystem is derived. We find an explicit connection to the concurrence of the depolarizing channel density matrix, which allows to characterize the features of the Uhlmann phase in terms of the degree of entanglement in the syste...

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