Quantum logic gates generated by SC-charge qubits coupled to a resonator

Obada, A.‐S. F.; Hessian, H. A.; Mohamed, A.-B.A.; Homid, A. H.

doi:10.1088/1751-8113/45/48/485305

Cited by 9 publications

(9 citation statements)

References 36 publications

(25 reference statements)

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“…. Afterwards, we measure the atomic-qubit state and obtain Ψ 3 = |a (µ|0 + ν|1 ) or Ψ 3 = |b (µ|0 − ν|1 ) depending on the readout which triggers an extra Pauli-Z (phase-flip) gate [51] acting on the SC device. As a result, the final charge qubit is in φ c = µ|0 + ν|1 and the quantum-state transmission is accomplished.…”

Section: Resultsmentioning

confidence: 99%

Quantum State Transmission in a Superconducting Charge Qubit-Atom Hybrid

Valado

Hufnagel

et al. 2016

Sci Rep

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Hybrids consisting of macroscopic superconducting circuits and microscopic components, such as atoms and spins, have the potential of transmitting an arbitrary state between different quantum species, leading to the prospective of high-speed operation and long-time storage of quantum information. Here we propose a novel hybrid structure, where a neutral-atom qubit directly interfaces with a superconducting charge qubit, to implement the qubit-state transmission. The highly-excited Rydberg atom located inside the gate capacitor strongly affects the behavior of Cooper pairs in the box while the atom in the ground state hardly interferes with the superconducting device. In addition, the DC Stark shift of the atomic states significantly depends on the charge-qubit states. By means of the standard spectroscopic techniques and sweeping the gate voltage bias, we show how to transfer an arbitrary quantum state from the superconducting device to the atom and vice versa.

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Section: Resultsmentioning

confidence: 99%

Quantum State Transmission in a Superconducting Charge Qubit-Atom Hybrid

Valado

Hufnagel

et al. 2016

Sci Rep

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“…[1][2][3] Building a quantum computer consists of several interrelating and interconnecting phases. [5][6][7][8] [4] A lot of dramatic improvement of qubit technology exploiting superconducting circuit quantum electrodynamics (QED) for achieving a scalable quantum computer has been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…[4] A lot of dramatic improvement of qubit technology exploiting superconducting circuit quantum electrodynamics (QED) for achieving a scalable quantum computer has been investigated. [5][6][7][8] DOI: 10.1002/andp.201900022…”

Section: Introductionmentioning

confidence: 99%

Direct Observation of Dissipation in Dynamical Search Algorithm using Transmon Qubits

et al. 2019

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Following recent work [Fortschritte der Physik 66, 1700080 (2018)], the dissipation effect of the dynamical quantum search algorithm (DQSA) is investigated. Such an algorithm is realized with the interaction of multi superconducting transmon qubits inside a 3D bus cavity. The dissipation of such system is caused by managing the sensitivity to charge noise via tuning the qubit frequency by employing Josephson energy. The probabilities of marked and unmarked states for the present algorithm have been calculated analytically and numerically. Such probabilities of marked states are sensitive to any change in the dissipation parameter. A deficiency causes the dissipation for the marked states, and that deficiency is added to the unmarked states. It is interesting to mention that one of the datasets at large dissipation rates gives an observation of the marked states probabilities which is related to the decoherence free subspace. It is predicted that the algorithm can be successfully implemented in the current experiments.

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“…In addition, there are other aspects: the strong coupling of a single photon to a SC qubit has been experimentally demonstrated [21] by using a one-dimensional transmission line resonator [22]. Recently, some quantum logic gates have proposed [23] by using a system consisting of a number of SC-charge qubits coupled to a resonator to study different quantum operations. Also, a new physical scheme for implementing a discrete quantum Fourier transform is proposed via SC qubits coupled to a single-mode SC-cavity [24].…”

Section: Introductionmentioning

confidence: 99%

Dispersive reservoir influence on the superconducting phase qubit

Hessian

Mohamed

Homid

2015

Int. J. Quantum Inform.

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In this article, an analytical description is presented based on the master equation. This master equation is formed from the system of superconducting phase qubit which is coupled to a torsional resonator and damped by a dispersive reservoir. An analytical approach for searching of some physical phenomena on the qubit system is presented, such as qubit inversion, purity and negativity. In addition, these phenomena are discussed for the resonance and off-resonance cases for many different initial states. From computational results, it is found that the mentioned phenomena depend on the dispersive reservoir parameter which leads to their death. However, the complete destruction of system coherence in the presence of dispersive reservoir leads to the death of entanglement between the qubit and torsional resonator.

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Quantum logic gates generated by SC-charge qubits coupled to a resonator

Cited by 9 publications

References 36 publications

Quantum State Transmission in a Superconducting Charge Qubit-Atom Hybrid

Quantum State Transmission in a Superconducting Charge Qubit-Atom Hybrid

Direct Observation of Dissipation in Dynamical Search Algorithm using Transmon Qubits

Dispersive reservoir influence on the superconducting phase qubit

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