.png){kind=icon}
.png){kind=icon}
Return
Practical quantum clock synchronization using weak coherent pulses
.png){kind=icon}
PRE
AI
DOI：10.1088/2040-8986/ae4913.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Establishing and maintaining a common time reference across spatially separated devices is a prerequisite for networked quantum experiments and secure communications. Classical two-way timing protocols such as network time protocol or precision time protocol are vulnerable to asymmetric channel delays and cannot provide the picosecond-level precision demanded by quantum repeater networks. We propose and numerically evaluate a quantum-enhanced clock synchronization protocol based on attenuated weak coherent pulses (WCPs) and bidirectional Hong-Ou-Mandel (HOM) interferometry. Our simulations assume telecom-band photons (1550 nm) with a temporal width of 10.0 ns, a repetition rate of f = 10 MHz, effective mean photon number & micro; = 1.0, detector efficiency eta=85%, detector timing jitter of 150 ps and channel loss 0.2 dB km-1. We simulate that sub-nanosecond clock-offset accuracy and precision can be achieved under these operating conditions. This work demonstrates that high-repetition-rate WCPs combined with HOM interference can provide flexible and secure quantum clock synchronization at sub-nanosecond precision.
Keywords:
weak coherent pulses
quantum clock synchronization
Hong-Ou-Mandel interference
bidirectional time transfer
optical fiber communication
quantum networks
photon interference