Squeezing-enhanced rotating-angle measurement beyond the quantum limit

Abstract

Aided by quantum sources, quantum metrology helps to enhance measurement precision. Here, we introduce a method to enhance the measurement of a rotation angle. As a proof of principle, assisted by a quantum state called the squeezed orbital-angular-position (OAP) state and balance homodyne detection, we demonstrate in experiments 3 dB-enhanced measurements of a rotation-angle beyond the shot noise limit. A precision of up to 17.7 nrad/Hz is obtained. Furthermore, we discuss means to further improve the measurement with a high-order precision OAP squeezed state. The method holds promise for future practical applications, such as in high-sensitive Sagnac interferometry.

Clarifying nonstatic-quantum-wave behavior through extending its analysis to the p-quadrature space: Interrelation between the q- and p-space wave-nonstaticities

“…Likewise, the nonstatic wave may also be generated by using the technique of squeezed-state generation. The nonstatic wave can be used in physical disciplines where the squeezed state plays a major role, such as interferometers of gravitational-wave detection [23][24][25], quantum information processing [26][27][28], and high-precision measurements [29,30].…”

Shuffled frog leaping algorithm based on quantum rotation angle

“…Shuffled frog leaping algorithm based on quantum Rotation Angle uses qubits to encode the current position of the frog, uses the quantum rotating gate to search the optimal position of the frog, and uses the quantum non-gate to realize the mutation of the frog position to avoid premature convergence [6] .…”

Noisy quantum gyroscope

“…Based on this idea, many schemes of quantum gyroscopes have been proposed. It was found that the entanglement in N00N states [29,30], continuous-variable squeezing [31][32][33], and optical nonlinearity [34] can enhance the sensitivity of optical gyroscopes beyond the SNL. A quantumenhanced sensitivity can also be achieved in matter-wave gyroscopes [35][36][37][38] by using spin squeezing [39][40][41] or entanglement.…”