A quantum-bit encoding converter

Abstract

From telecommunication to computing architectures, the realm of classical information hinges on converter technology to enable the exchange of data between digital and analog formats, a process now routinely performed across a variety of electronic devices. A similar exigency exists as well in quantum information technology where different frameworks are being developed for quantum computing, communication, and sensing. Thus, efficient quantum interconnects are a major need to bring these parallel approaches together and scale up quantum information systems. So far, however, the conversion between different optical quantum-bit encodings has remained challenging due to the difficulty of preserving fragile quantum superpositions and the demanding requirements for postselection-free implementations. Here we demonstrate such a conversion of quantum information between the two main paradigms, namely discrete- and continuous-variable qubits. We certify the protocol on a complete set of single-photon qubits, successfully converting them to cat-state qubits with fidelities exceeding the classical limit. Our result demonstrates an essential tool for enabling interconnected quantum devices and architectures with enhanced versatility and scalability.

References in corpus (9)

• The Quantum Internet
• Photonic quantum technologies
• Quantum technologies with hybrid systems
• Efficient quantum memory for single photon polarization qubits
• Optical synthesis of large-amplitude squeezed coherent-state superpositions with minimal resources
• Optical continuous-variable qubit
• High-efficiency WSi superconducting nanowire single-photon detectors for quantum state engineering in the near infrared
• Generation of hybrid entanglement between a single-photon polarization qubit and a coherent state
• Production and applications of non-Gaussian quantum states of light

Cited by in corpus (16)

• Experimental implementation of the optical fractional Fourier transform in the time-frequency domain
• Real-time observation of picosecond-timescale optical quantum entanglement toward ultrafast quantum information processing
• Fault-tolerant quantum computation by hybrid qubits with bosonic cat-code and single photons
• Entangling Schrödinger's cat states by bridging discrete- and continuous-variable encoding
• Long-distance entanglement sharing using hybrid states of discrete and continuous variables
• Hierarchical Verification of Non-Gaussian Coherence in Bosonic Quantum States
• A photonic which-path entangler based on longitudinal cavity-qubit coupling
• CHSH Bell Tests For Optical Hybrid Entanglement
• Recovering quantum entanglement after its certification
• Qumode transfer between continuous and discrete variable devices
• Adapting coherent-state superpositions in noisy channels
• Converting between qubits of different forms
• Deterministic generation of hybrid entangled states using quantum walks
• Quantum non-Gaussian high Fock states of light pulses and their superpositions
• Photonic Hybrid Quantum Computing
• A Hybrid Approach to Mitigate Errors in Linear Photonic Bell-State Measurement for Quantum Interconnects