Hybrid quantum circuit consisting of a superconducting flux qubit coupled to a spin ensemble and a transmission-line resonator

Xiang, Ze-Liang; Lü, Xin-You; Li, Tiefu; You, J. Q.; Nori, Franco

doi:10.1103/physrevb.87.144516

Cited by 94 publications

(73 citation statements)

References 45 publications

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“…Recently, some novel hybrid systems consisting of a SC flux qubit magnetically coupled to a nitrogen-vacancy center ensemble (NVE) were proposed [21][22][23][24] and one of these implemented experimentally [25] in order to enhance the corresponding magnetic-dipole interactions. Calculations in Ref.…”

Section: Introductionmentioning

confidence: 99%

Quantum memory using a hybrid circuit with flux qubits and nitrogen-vacancy centers

et al. 2013

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We propose how to realize high-fidelity quantum storage using a hybrid quantum architecture including two coupled flux qubits and a nitrogen-vacancy center ensemble (NVE). One of the flux qubits is considered as the quantum computing processor and the NVE serves as the quantum memory. By separating the computing and memory units, the influence of the quantum computing process on the quantum memory can be effectively eliminated, and hence the quantum storage of an arbitrary quantum state of the computing qubit could be achieved with high fidelity. Furthermore the present proposal is robust with respect to fluctuations of the system parameters, and it is experimentally feasibile with currently available technology.

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Section: Introductionmentioning

confidence: 99%

Quantum memory using a hybrid circuit with flux qubits and nitrogen-vacancy centers

et al. 2013

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“…[1][2][3] They are of particular interest in the construction of hybrid quantum systems utilizing the long coherence times of spin-based qubits and the strong coupling of superconducting qubits. [4][5][6][7] Hybrid quantum systems have been realized for nitrogen-vacancy (N-V) centers coupled to transmon qubits. 4 These systems are limited by dephasing of the spin ensemble ðT Ã 2 Þ which is often hundreds of nanoseconds in solids.…”

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confidence: 99%

Fast, low-power manipulation of spin ensembles in superconducting microresonators

Sigillito

Malissa

Tyryshkin

et al. 2014

Applied Physics Letters

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We demonstrate the use of high-Q superconducting coplanar waveguide (CPW) microresonators to perform rapid manipulations on a randomly distributed spin ensemble using very low microwave power (400 nW). This power is compatible with dilution refrigerators, making microwave manipulation of spin ensembles feasible for quantum computing applications. We also describe the use of adiabatic microwave pulses to overcome microwave magnetic field (B 1 ) inhomogeneities inherent to CPW resonators. This allows for uniform control over a randomly distributed spin ensemble. Sensitivity data are reported showing a single shot (no signal averaging) sensitivity to 10 7 spins or 3 × 10 4 spins/ √ Hz with averaging.

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“…Suppose that cavity l is dispersively coupled to the |e ↔ |f transition of each of qutrits Here, ω f e is the |e ↔ |f transition frequency of the qutrits and ω c l is the frequency of cavity l. |e ↔ |f transition frequency of each qutrit and the frequency of cavity l, respectively. This condition can be met by prior adjustment of the qutrit's level spacings or the frequency of cavity l. For instance, the level spacings of superconducting qutrits can be rapidly (within 1 ∼ 3 ns) tuned [43,44]; the level spacings of NV centers can be readily adjusted by changing the external magnetic field applied along the crystalline axis of each NV center [45,46]; and the level spacings of atoms/quantum dots can be adjusted by changing the voltage on the electrodes around each atom/quantum dot [47]. In addition, the frequency for an optical cavity can be changed in experiments [48], and the frequency of a microwave cavity can be rapidly adjusted with a few nanoseconds [49,50].…”

Section: A Qutrit-cavity Dispersive Interactionmentioning

confidence: 99%

Generation of quantum entangled states of multiple groups of qubits distributed in multiple cavities

Liu

Fang

et al. 2020

Phys. Rev. A

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Provided that cavities are initially in a Greenberger-Horne-Zeilinger (GHZ) entangled state, we show that GHZ states of N -group qubits distributed in N cavities can be created via a 3-step operation. The GHZ states of the N -group qubits are generated by using N -group qutrits placed in the N cavities. Here, "qutrit" refers to a three-level quantum system with the two lowest levels representing a qubit while the third level acting as an intermediate state necessary for the GHZ state creation. This proposal does not depend on the architecture of the cavity-based quantum network and the way for coupling the cavities. The operation time is independent of the number of qubits. The GHZ states are prepared deterministically because no measurement on the states of qutrits or cavities is needed. In addition, the third energy level of the qutrits during the entire operation is virtually excited and thus decoherence from higher energy levels is greatly suppressed. This proposal is quite general and can in principle be applied to create GHZ states of many qubits using different types of physical qutrits (e.g., atoms, quantum dots, NV centers, various superconducting qutrits, etc.) distributed in multiple cavities. As a specific example, we further discuss the experimental feasibility of preparing a GHZ state of four-group transmon qubits (each group consisting of three qubits) distributed in four one-dimensional transmission line resonators arranged in an array.

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Hybrid quantum circuit consisting of a superconducting flux qubit coupled to a spin ensemble and a transmission-line resonator

Cited by 94 publications

References 45 publications

Quantum memory using a hybrid circuit with flux qubits and nitrogen-vacancy centers

Quantum memory using a hybrid circuit with flux qubits and nitrogen-vacancy centers

Fast, low-power manipulation of spin ensembles in superconducting microresonators

Generation of quantum entangled states of multiple groups of qubits distributed in multiple cavities

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