Xiang‐Bin Wang

Ultrastrong-coupling quantum-phase-transition phenomena in a few-qubit circuit QED system

2017 · Physical Review A

We study ultrastrong-coupling quantum-phase-transition phenomena in a few-qubit system. In the one-qubit case, three second-order transitions occur and the Goldstone mode emerges under the condition of ultrastrong-coupling strength. Moreover, a first-order phase transition occurs between …

General theory of sending-or-not-sending twin-field quantum key distribution

2019 · arXiv (Cornell University)

We present improved method of sending-or-not-sending twin-field quantum key distribution (SNS TF-QKD) based on its structure and the application of error rejection. %And we present iteration formula for bit-flip error rate of the survived bits …

Round robin differential phase shift quantum key distribution with yes-no detectors only

2019 · arXiv (Cornell University)

In the original round-robin differential-phase-shift (RRDPS) quantum key distribution and its improved method, the photon-number-resolving detectors are must for the security. We present a RRDPS protocol with yes-no detectors only. We get the upper bounds …

Practical Long‐Distance Measurement‐Device‐Independent Quantum Key Distribution By Four‐Intensity Protocol

2021 · Advanced Quantum Technologies

Abstract Quantum key distribution (QKD) can provide unconditionally secure private communication between two remote parties. The measurement‐device‐independent (MDI) QKD can remove all security loopholes in measurement devices. However, the large value of the observed error …

Post-selection in noisy Gaussian boson sampling: part is better than whole

2023 · Quantum Science and Technology

Abstract Gaussian boson sampling (GBS) is originally proposed to show quantum advantage with quantum linear optical elements. Recently, several experimental breakthroughs based on GBS pointing to quantum computing supremacy have been presented. However, due to …