Demonstration of Controlled-Phase Gates between Two Error-Correctable Photonic Qubits

Xu, Yihang; Ma, Ying; Cai, Wenli; Mu, Xiang Dong; Dai, Wenhan; Wang, Wei; Hu, Lunzhen; Li, X.; Han, Jie; Wang, H.; Song, Yipu; Yang, Zhen‐Biao; Zheng, Shi‐Biao; Sun, Luyan

doi:10.1103/physrevlett.124.120501

Cited by 61 publications

(48 citation statements)

References 61 publications

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“…[39,40] reported on experimental demonstration of controlled-phase gates between transmon qubits, while another realization of controlled-phase gates between two photonic qubits encoded in photonic fields stored in cavities or between time-bin qubits were accomplished in Refs. [41] and [42], respectively. Usually, the CN OT gates in these platforms are generated as a composite gate operation formed from one two-qubit contolled gate and from suitable one-qubit rotations [40,42].…”

Section: Architecture Specific Decompositionmentioning

confidence: 99%

Approaching the theoretical limit in quantum gate decomposition

Rakyta,

Zimborás

2021

Preprint

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In this work we propose a novel numerical approach to decompose general quantum programs in terms of single-and two-qubit quantum gates with a CN OT gate count very close to the current theoretical lower bounds. In particular, it turns out that 15 and 63 CN OT gates are sufficient to decompose a general 3and 4-qubit unitary, respectively. This is currently the lowest achieved gate count compared to other algorithms. Our approach is based on a sequential optimization of parameters related to the single-qubit rotation gates involved in a pre-designed quantum circuit used for the decomposition. In addition, the algorithm can be adopted to sparse inter-qubit connectivity architectures provided by current mid-scale quantum computers, needing only a few additional CN OT gates to be implemented in the resulting quantum circuits.

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Section: Architecture Specific Decompositionmentioning

confidence: 99%

Approaching the theoretical limit in quantum gate decomposition

Rakyta,

Zimborás

2021

Preprint

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“…By achieving a gate fidelity above 98%, this study showcases the potential of such engineered quantum gates between bosonic modes. More recently, a controlled-phase gate has been demonstrated between two binomial logical qubits in reference [20]. Here, the microwave drives are tailored to induce a geometric phase that depends on the joint state of the two bosonic modes.…”

Section: Operations On Multiple Bosonic Modesmentioning

confidence: 99%

Quantum information processing with bosonic qubits in circuit QED

Joshi

Noh²,

Gao³

2021

Quantum Sci. Technol.

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The unique features of quantum theory offer a powerful new paradigm for information processing. Translating these mathematical abstractions into useful algorithms and applications requires quantum systems with significant complexity and sufficiently low error rates. Such quantum systems must be made from robust hardware that can coherently store, process, and extract the encoded information, as well as possess effective quantum error correction (QEC) protocols to detect and correct errors. Circuit quantum electrodynamics (cQED) provides a promising hardware platform for implementing robust quantum devices. In particular, bosonic encodings in cQED that use multi-photon states of superconducting cavities to encode information have shown success in realizing hardware-efficient QEC. Here, we review recent developments in the theory and implementation of QEC with bosonic codes and report the progress made toward realizing fault-tolerant quantum information processing with cQED devices.

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“…For bosonic-encoded qubits, the CPHASE gate has been demonstrated fairly recently, though in a protocol susceptible to photon loss during the gate operation [38].…”

Section: Pnd Hamiltonian Engineering For Coupled Cavitiesmentioning

confidence: 99%

Photon-Number-Dependent Hamiltonian Engineering for Cavities

et al. 2021

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Cavity resonators are promising resources for quantum technology, while native nonlinear interactions for cavities are typically too weak to provide the level of quantum control required to deliver complex targeted operations. Here we investigate a scheme to engineer a target Hamiltonian for photonic cavities using ancilla qubits. By off resonantly driving dispersively coupled ancilla qubits, we develop an optimized approach to engineering an arbitrary photon-number-dependent Hamiltonian for the cavities while minimizing the operation errors. The engineered Hamiltonian admits various applications including canceling unwanted cavity self-Kerr interactions, creating higher-order nonlinearities for quantum simulations, and designing quantum gates resilient to noise. Our scheme can be implemented with coupled microwave cavities and transmon qubits in superconducting circuit systems.

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Demonstration of Controlled-Phase Gates between Two Error-Correctable Photonic Qubits

Cited by 61 publications

References 61 publications

Approaching the theoretical limit in quantum gate decomposition

Approaching the theoretical limit in quantum gate decomposition

Quantum information processing with bosonic qubits in circuit QED

Photon-Number-Dependent Hamiltonian Engineering for Cavities

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