Publisher's Note: Simple procedure for phase-space measurement and entanglement validation [Phys. Rev. A 
<b>96</b>
, 022117 (2017)]

Rundle, Russell; Mills, P. W.; Tilma, Todd; Samson, J. H.; Everitt, Mark J.

doi:10.1103/physreva.96.049903

Cited by 9 publications

(18 citation statements)

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“…In CV systems, the negativity of the WF is typically considered as a nonclassical signature of the state [38,39]. However, in discrete systems things are more complicated because the negativity shows subtle complexities [35]. While for more general mixed states, the minimum is only related to r regardless of θ and φ, i.e., W min = 1 2π 2 (1− √ 3r).…”

Section: Theorymentioning

confidence: 99%

“…[29] can handle arbitrary spin systems. Just recently, complete and continuous WFs have been measured for the first time for discrete systems of two Bell states and five-qubit Greenberger-Horne-Zeilinger state [35] based on IBM superconducting-qubit quantum processor [36]. Though convenient, using such a processor, the measurement of the WF suffers from various imperfections, such as indirect implementation of rotations and detection due to the limited operations that IBM has made available to the user, and considerable noises in the system resulting in imperfect operations and state preparation.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of complete and continuous Wigner functions for discrete atomic systems

et al. 2018

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We measure complete and continuous Wigner functions of a two-level cesium atom in both a nearly pure state and highly mixed states. We apply the method [T. Tilma et al., Phys. Rev. Lett. 117, 180401 (2016)] of strictly constructing continuous Wigner functions for qubit or spin systems. We find that the Wigner function of all pure states of a qubit has negative regions and the negativity completely vanishes when the purity of an arbitrary mixed state is less than 2 3 . We experimentally demonstrate these findings using a single cesium atom confined in an optical dipole trap, which undergoes a nearly pure dephasing process. Our method can be applied straightforwardly to multi-atom systems for measuring the Wigner function of their collective spin state.PACS numbers:

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Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of complete and continuous Wigner functions for discrete atomic systems

et al. 2018

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“…For nonseparable laser beams through a toroidal mirror see [21]. For other classes of systems it can also be determined: one can mention two Bell states and the five-qubit Greenberger-Horne-Zeilinger (GHZ) spin Schrödinger cat state [22]; a single harmonically trapped atom [23]; an ensemble of helium atoms formed by partially coherent illumination of a double slit [24], etc. This has practical importance in quantum information processing, because the Wigner function provides more information about the quantum system than any other quantum approach [25].…”

Section: Introductionmentioning

confidence: 99%

Quantum phase diagrams of matter-field Hamiltonians II: Wigner function analysis

et al. 2021

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Non-classical states are of practical interest in quantum computing and quantum metrology. These states can be detected through their Wigner function negativity in some regions. We show that the surfaces of minimum fidelity or maximum Bures distance constitute a signature of quantum phase transitions. Additionally the behaviour of the Wigner function associated to the field modes carry the information of both, the entanglement properties between matter and field sectors, and the regions of the parameter space where the quantum phase transitions take place. A finer classification for the continuous phase transitions is obtained through the computation of the surface of maximum Bures distance.

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“…From such platform we have access to a five-qubit system [2] in which we can manipulate it from unitary operations (unitary operators) and measurements. This platform has been used to experimentally confirm some theoretical results on quantum information and computation [3][4][5][6][7] as well as to implement high technology quantum protocols like teleportation [8,9], among others [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Simulating single-spin dynamics on an IBM five-qubit chip

Alves

Gomes

Santana

et al. 2020

Rev. Bras. Ensino Fís.

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In this paper we show how the IBM superconducting chips can be a powerful tool for teaching foundations of quantum mechanics for undergraduate students (for graduates as well, in some cases). To this end, we briefly discuss about the main elements of the IBM Quantum Experience platform necessary to understand this paper, i.e., how to implement operations and single-qubit measurements. We experimentally study the dynamics of single spin systems interacting with static and time-dependent magnetic fields. First, we study the resonant behavior of a single spin coupled to a time-dependent rotating magnetic field. To end, we study the Larmor precession phenomenon. In both cases we show the theoretical and real experimental implementation. This article could be useful in introductory courses on quantum mechanics and nuclear magnetic resonance foundations, for example.

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Publisher's Note: Simple procedure for phase-space measurement and entanglement validation [Phys. Rev. A 96 , 022117 (2017)]

Cited by 9 publications

References 0 publications

Measurement of complete and continuous Wigner functions for discrete atomic systems

Measurement of complete and continuous Wigner functions for discrete atomic systems

Quantum phase diagrams of matter-field Hamiltonians II: Wigner function analysis

Simulating single-spin dynamics on an IBM five-qubit chip

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