Conditional rotation of two strongly coupled semiconductor charge qubits

Li, Hai-Ou; Cao, Gang; Yu, Guodong; Xiao, Ming; Guo, Guang‐Can; Jiang, Hong-Wen

doi:10.1038/ncomms8681

Cited by 63 publications

(62 citation statements)

References 27 publications

(57 reference statements)

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“…So far, short range (∼ 100 nm) qubit-qubit interaction has been realized via capacitive or exchange coupling between charge [4][5][6] and spin qubits [7][8][9][10], which was expanded by making use of interactions mediated by additional qubits (∼ 400 nm) [11] or electronic cavities (∼ 1.7 µm) [12]. However, it is predicted that the range of interaction between semiconductor qubits can be increased significantly using microwave photons [3,13,14].…”

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confidence: 99%

Microwave Photon-Mediated Interactions between Semiconductor Qubits

et al. 2018

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The realization of a coherent interface between distant charge or spin qubits in semiconductor quantum dots is an open challenge for quantum information processing. Here we demonstrate both resonant and non-resonant photon-mediated coherent interactions between double quantum dot charge qubits separated by several tens of micrometers. We present clear spectroscopic evidence of the collective enhancement of the resonant coupling of two qubits. With both qubits detuned from the resonator we observe exchange coupling between the qubits mediated by virtual photons. In both instances pronounced bright and dark states governed by the symmetry of the qubit-field interaction are found. Our observations are in excellent quantitative agreement with masterequation simulations. The extracted two-qubit coupling strengths significantly exceed the linewidths of the combined resonator-qubit system. This indicates that this approach is viable for creating photon-mediated twoqubit gates in quantum dot based systems.Semiconductor nanostructure based systems are one of the promising contenders for quantum information processing since they offer flexibility in tuning, long coherence times and well-established fabrication techniques [1,2]. However, scaling to larger numbers of qubits remains a challenge, since many coupling mechanisms for realizing two-qubit gates are short range, i.e. limited to nearest neighbors. For scaling to larger systems and eventually to a full scale quantum computer, a combination of short and longer range interactions seems promising [3].So far, short range (∼ 100 nm) qubit-qubit interaction has been realized via capacitive or exchange coupling between charge [4-6] and spin qubits [7-10], which was expanded by making use of interactions mediated by additional qubits (∼ 400 nm) [11] or electronic cavities (∼ 1.7 µm) [12]. However, it is predicted that the range of interaction between semiconductor qubits can be increased significantly using microwave photons [3,13,14]. A key ingredient, the strong coupling of individual charges [15,16] or spins [17][18][19] to individual microwave photons, has recently been realized in semiconductor implementations of circuit quantum electrodynamics (QED) [20].Here, we present experiments in which the coherent photon-mediated coupling between two spatially separated semiconductor qubits is realized both in the resonant and the dispersive regime using high impedance SQUID array resonators. The high Josephson inductance of the SQUID array increases the strength of the vacuum fluctuations of the electric field, enhancing the coupling strength of the individual qubits to the resonator [16] and consequently the qubitqubit coupling, which allows us to overcome the limitations of prior experiments [17,21,22]. This key step holds the strong promise that two-qubit gates based on photon-mediated interactions, which are a corner-stone in quantum information processing with superconducting circuits [23], are implementable with semiconductor qubits based on a variety of material systems. ...

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Microwave Photon-Mediated Interactions between Semiconductor Qubits

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“…关于用电荷量子比特构建两量子逻辑门, 研究者们主要利用的是电容耦合. 2009 年, 英国卡文迪许实验室的 Petersson 等 [67] 和日本电信电话株式会社研究所的 Shinkai 等 [68] 都实现了两个电荷量子比特的电容耦合, 但是均没有实现逻辑门操控, 直到 2015 年, 中国科学技术大学的郭国平教授研究组利用电容耦合的两个电荷量子比特首次实现了两电荷量子比特的控制非 (Control-NOT, CNOT) 的逻辑操作 [29] , 测量保真度达到 68%, 操作速度达到 6 GHz. 如图 11 为两电荷量子比特实验装置示意图.…”

Section: 空穴编码的自旋量子比特unclassified

Quantum computation based on semiconductor quantum dots

Zhang¹,

Li²,

Wang³

et al. 2017

Sci. Sin.-Inf.

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“…In the same way, the abrupt energy shift around the anti-crossing points ( 1 = 0 and  3 = 0) tells the value of their coupling strength: J 13 approximately equals 135 μeV. These large coupling strengths will enable us to implement three-qubit operations [18,24]. For instance, the coherent rotations of the target qubit, such as Larmor procession [8], Landau-Zener-Stütckelberg (LZS) interferences [9], and Rabi oscillations [10], usually occur when the qubit is brought from an initial state to its detuning anti-crossing point.…”

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Controlled Quantum Operations of a Semiconductor Three-Qubit System

Cao

et al. 2018

Phys. Rev. Applied

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The Coulomb interactions between electrons play important roles in coupling multiple qubits in various quantum systems. Here we demonstrate controlled quantum operations of three electron charge qubits based on three capacitively coupled semiconductor double quantum dots. The strong interactions between one double dot and other two double dots enable us to control the coherent rotations of one target qubit by the states of two control qubits.

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Conditional rotation of two strongly coupled semiconductor charge qubits

Cited by 63 publications

References 27 publications

Microwave Photon-Mediated Interactions between Semiconductor Qubits

Microwave Photon-Mediated Interactions between Semiconductor Qubits

Quantum computation based on semiconductor quantum dots

Controlled Quantum Operations of a Semiconductor Three-Qubit System

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