All-optical storage of phase-sensitive quantum states of light

Abstract

We experimentally demonstrate storage and on-demand release of phase-sensitive, photon-number superposition states of the form $\alpha |0⟩+\beta e^{i\theta }|1⟩$ for an optical quantized oscillator mode. For this purpose, we introduce a phase-probing mechanism to a storage system composed of two concatenated optical cavities, which was previously employed for storage of phase-insensitive single-photon states [Phys. Rev. X 3, 041028 (2013)]. This is the first demonstration of all-optically storing highly nonclassical and phase-sensitive quantum states of light. The strong nonclassicality of the states after storage becomes manifest as a negative region in the corresponding Wigner function shifted away from the origin in phase space. This negativity is otherwise, without the phase information of the memory system, unobtainable. While our scheme includes the possibility of optical storage, on-demand release and synchronization of arbitrary single-rail qubit states, it is not limited to such states. In fact, our technique is extendible to more general phase-sensitive states such as multiphoton superposition or entangled states, and thus it represents a significant step toward advanced optical quantum information processing, where highly non-classical states are utilized as resources.

arXiv comment12 pages, 11 figures

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• Building a large-scale quantum computer with continuous-variable optical technologies
• Nonlinear squeezing for measurement-based non-Gaussian operations in time domain
• Efficient backcasting search for optical quantum state synthesis
• Wave-function engineering via conditional quantum teleportation with non-Gaussian entanglement resource
• All-optical quantum computing using cubic phase gates
• Switching-free time-domain optical quantum computation with quantum teleportation
• Phase Locking between Two All-Optical Quantum Memories
• Time-domain programmable beam-splitter operations for an optical phase-sensitive non-Gaussian state
• Scalable Optical Quantum State Synthesizer with Dual-Mode Resonator Memory
• Theory of Symmetry-Protected Two-Photon Coherence