Transferring entangled states of photonic cat-state qubits in circuit QED

Liu, Tong; Zheng, Zhen-Fei; Fang, Yu-Liang; Yang, Chui‐Ping

doi:10.1007/s11467-019-0949-5

Cited by 12 publications

(2 citation statements)

References 87 publications

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“…with cat-state qubits [47][48][49][50][51][52], implementing a multi-qubit Mølmer-Sørensen entangling gate using cat-state qubits [53], and realizing a multi-target-qubit controlled-phase gate of cat-state qubits [54]. Schemes have also been proposed for creating non-hybrid Greenberger-Horne-Zeilinger (GHZ) entangled states of cat-state qubits [55,53], preparing Wtype entangled states of cat-state qubits [56], and transferring entangled states of cat-state qubits [57]. In addition, fault-tolerant quantum computation [58,59] and holonomic geometric quantum control [60] of cat-state qubits have been studied.…”

Section: Introductionmentioning

confidence: 99%

Single-step implementation of a hybrid controlled-not gate with one superconducting qubit simultaneously controlling multiple target cat-state qubits

Yang

2022

Phys. Rev. A

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Hybrid quantum gates have recently drawn considerable attention. They play significant roles in connecting quantum information processors with qubits of different encoding and have important applications in the transmission of quantum states between a quantum processor and a quantum memory. In this work, we propose a single-step implementation of a multi-target-qubit controlled-NOT gate with one superconducting (SC) qubit simultaneously controlling n target cat-state qubits. In this proposal, the gate is implemented with n microwave cavities coupled to a three-level SC qutrit. The two logic states of the control SC qubit are represented by the two lowest levels of the qutrit, while the two logic states of each target cat-state qubit are represented by two quasi-orthogonal cat states of a microwave cavity. This proposal operates essentially through the dispersive coupling of each cavity with the qutrit. The gate realization is quite simple because it requires only a single-step operation. There is no need of applying a classical pulse or performing a measurement. The gate operation time is independent of the number of target qubits, thus it does not increase as the number of target qubits increases. Moreover, because the third higher energy level of the qutrit is not occupied during the gate operation, decoherence from the qutrit is greatly suppressed. As an application of this hybrid multi-target-qubit gate, we further discuss the generation of a hybrid Greenberger-Horne-Zeilinger (GHZ) entangled state of SC qubits and cat-state qubits. As an example, we numerically analyze the experimental feasibility of generating a hybrid GHZ state of one SC qubit and three cat-state qubits within present circuit QED technology. This proposal is quite general and can be extended to implement a hybrid controlled-NOT gate with one matter qubit (of different type) simultaneously controlling multiple target cat-state qubits in a wide range of physical systems, such as multiple microwave or optical cavities coupled to a three-level natural or artificial atom.

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Section: Introductionmentioning

confidence: 99%

Single-step implementation of a hybrid controlled-not gate with one superconducting qubit simultaneously controlling multiple target cat-state qubits

Yang

2022

Phys. Rev. A

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“…In recent years, besides progress achieved with SPS qubits, considerable theoretical and experimental activity have also been shifted to QIP with coherent-state (CS) or cat-state (C-S) qubits. There exists a number of works for QIP using qubits encoded with coherent states [6,[8][9][10] or encoded with cat-state qubits [7,[11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Transferring quantum entangled states between multiple single-photon-state qubits and coherent-state qubits in circuit QED

Zhang

Yang

2021

Preprint

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We present a way to transfer maximally-or partially-entangled states of n single-photon-state (SPS) qubits onto n coherent-state (CS) qubits, by employing 2n microwave cavities coupled to a superconducting flux qutrit. The two logic states of a SPS qubit here are represented by the vacuum state and the single-photon state of a cavity, while the two logic states of a CS qubit are encoded with two coherent states of a cavity. Because of using only one superconducting qutrit as the coupler, the circuit architecture is significantly simplified. The operation time for the state transfer does not increase with the increasing of the number of qubits. When the dissipation of the system is negligible, the quantum state can be transferred in a deterministic way since no measurement is required. Furthermore, the higher-energy intermediate level of the coupler qutrit is not excited during the entire operation and thus decoherence from the qutrit is greatly suppressed.As a specific example, we numerically demonstrate that the high-fidelity transfer of a Bell state of two SPS qubits onto two CS qubits is achievable within the present-day circuit QED technology.Finally, it is worthy to note that when the dissipation is negligible, entangled states of n CS qubits can be transferred back onto n SPS qubits by performing reverse operations. This proposal is quite general and can be extended to accomplish the same task, by employing a natural or artificial atom to couple 2n microwave or optical cavities.

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Generation of a hybrid W entangled state of three photonic qubits with different encodings

Su,

Bin,

Zhang

et al. 2024

Quantum Inf Process

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Transferring entangled states of photonic cat-state qubits in circuit QED

Cited by 12 publications

References 87 publications

Single-step implementation of a hybrid controlled-not gate with one superconducting qubit simultaneously controlling multiple target cat-state qubits

Single-step implementation of a hybrid controlled-not gate with one superconducting qubit simultaneously controlling multiple target cat-state qubits

Transferring quantum entangled states between multiple single-photon-state qubits and coherent-state qubits in circuit QED

Generation of a hybrid W entangled state of three photonic qubits with different encodings

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