Demonstration of deterministic SWAP gate between superconducting and frequency-encoded microwave-photon qubits

Abstract

The number of superconducting qubits contained in a single quantum processor is increasing steadily. However, to realize a truly useful quantum computer, it is inevitable to increase the number of qubits much further by distributing quantum information among distant processors using flying qubits. Here, we demonstrate a key element towards this goal, namely, a SWAP gate between the superconducting-atom and microwave-photon qubits. The working principle of this gate is the single-photon Raman interaction, which results from strong interference in one-dimensional optical systems and enables a high gate fidelity insensitively to the pulse shape of the photon qubit, by simply bouncing the photon qubit at a cavity attached to the atom qubit. We confirm the bidirectional quantum state transfer between the atom and photon qubits. The averaged fidelity of the photon-to-atom (atom-to-photon) state transfer reaches 0.829 (0.801), limited mainly by the energy relaxation time of the atom qubit. The present atom-photon gate, equipped with an in situ tunability of the gate type, would enable various applications in distributed quantum computation using superconducting qubits and microwave photons.

arXiv comment14 pages, 5 figures

References in corpus (46)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
• Quantum state transfer and entanglement distribution among distant nodes in a quantum network
• Circuit Quantum Electrodynamics
• A Quantum Engineer's Guide to Superconducting Qubits
• Coupled quantum dots as quantum gates
• Microwave photonics with superconducting quantum circuits
• Strong quantum computational advantage using a superconducting quantum processor
• Cavity-based quantum networks with single atoms and optical photons
• Resonance Fluorescence of a Single Artificial Atom
• Distributed Quantum Computation over Noisy Channels
• Photon-mediated interactions between distant artificial atoms
• All-Optical Routing of Single Photons by a One-Atom Switch Controlled by a Single Photon
• The Future of Quantum Computing with Superconducting Qubits
• Deterministic Quantum State Transfer and Generation of Remote Entanglement using Microwave Photons
• Frequency-encoded photonic qubits for scalable quantum information processing
• Repeat-Until-Success Quantum Computing
• Towards a Distributed Quantum Computing Ecosystem
• Photon scattering by a three-level emitter in a one-dimensional waveguide
• Dynamic quantum Kerr effect in circuit quantum electrodynamics
• Controlled catch and release of microwave photon states
• Single microwave-photon detector using an artificial $\Lambda$-type three-level system
• Deterministic remote entanglement of superconducting circuits through microwave two-photon transitions
• Microwave-controlled generation of shaped single photons in circuit quantum electrodynamics
• Quantum non-demolition detection of an itinerant microwave photon
• Ramsey interference with single photons
• Deterministic photon-photon (SWAP)^{1/2} gate using a lambda system
• Single photon absorption by a single quantum emitter
• Single-Shot Quantum Non-Demolition Detection of Itinerant Microwave Photons
• Detecting itinerant microwave photons with engineered non-linear dissipation
• Detection of zeptojoule microwave pulses using electrothermal feedback in proximity-induced Josephson junctions
• Violating Bell's inequality with remotely-connected superconducting qubits
• Extraction of a single photon from an optical pulse
• Microwave Quantum Optics with an Artificial Atom
• Microwave Down-Conversion with an Impedance-Matched $\Lambda$ System in Driven Circuit QED
• Large Dispersive Shift of Cavity Resonance Induced by a Superconducting Flux Qubit in the Straddling Regime
• Implementation of an impedance-matched Λsystem by dressed-state engineering
• A review on quantum information processing in cavities
• Optimal two-qubit quantum circuits using exchange interactions
• Theory of microwave single-photon detection using an impedance-matched $\Lambda$ system
• Realization of a Universal Quantum Gate Set for Itinerant Microwave Photons
• On-demand generation and characterization of a microwave time-bin qubit
• Breaking the trade-off between fast control and long lifetime of a superconducting qubit
• Tunable quantum gate between a superconducting atom and a propagating microwave photon
• Implementations of more general solid-state (SWAP)${}^{1/m}$ and controlled-(swap)${}^{1/m}$ gates
• Ion-Photonic Frequency Qubit Correlations for Quantum Networks