Generation of Strong Mechanical–Mechanical Entanglement by Pump Modulation

Abstract

The implementation of strong quantum entanglement between two macroscopic mechanical oscillators is a longstanding pursued goal in fundamental research or applied science. Here, an effective scheme is proposed to generate strong mechanical–mechanical entanglement in a double‐oscillator optomechanical system via only introducing the sole amplitude‐modulated pattern into the pump field instead without the requirement of any extra techniques. Based on two mechanical oscillators with identical or different frequencies, a specific kind of amplitude‐modulated pump field is respectively designed, which successfully manipulates the mechanical oscillators into the highly entangled two‐mode squeezed state. The maximum value of the logarithmic negativity that quantifies the generated entanglement reaches about 9 ebits in the appropriate parameter regime, which greatly surpasses the bound 1 ebits on the maximal stationary entanglement from the two‐mode parametric interaction. Moreover, the obtained entanglement can be detected via resorting to an ancillary cavity mode with homodyne detection technique. Compared with the previous congeneric schemes, this scheme involves fewer modulation techniques and may provide a new perspective to effectively manipulate the mechanical quantum states in optomechanical systems utilizing the time‐dependent modulation.

Chaos Generation in Opto‐Mechanical Coupling System Assisted by Two‐Level Atoms

“…[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] DOI: 10.1002/andp. 202200470 For example, Schrödinger cat states, [25,26] squeezing of light, [27] macroscopic entangle states, [28,29] and feedback cooling by radiation pressure [30] were realized in optomechanical systems. Generally, in order to overcome the intrinsic field and mechanical losses, a powerful external field should be introduced into this system.…”

Cooperative-effect-induced one-way steering in open cavity magnonics

“…Entanglement as a vital quantum phenomenon is the most intrinsic feature of quantum mechanics with a variety of applications in continuous variable information processing 3 , which has received widespread attention. And a great deal of effort has been devoted to generating and controlling entanglement [4][5][6][7][8] . The EPR steering, as a sufficient condition for entanglement, and a necessary condition for Bell nonlocality, was recognized by Schrödinger in 1935 9 , and put on a firm mathematical footing by refs.…”

Entanglement and Asymmetric Steering Between Distant Magnon and Mechanical Modes in an Optomagnonic‐Mechanical System

“…Long-distance entanglement, which is of great importance for distributed quantum networks and quantum-enhanced metrology, [1,2] has attracted extensive attention. Recently, the long-distance entanglement between macroscopic objects has been successfully prepared and manipulated in many quantum systems, such as establishing entanglement between macroscopic mechanical oscillator and atomic ensemble via unidirectional light coupling, [3] realizing entanglement between two remote mechanical oscillators by means of pump modulation, [4] and entangling two magnon modes via magnetostrictive interaction. [5] In addition, a study has been conducted DOI: 10.1002/andp.202200315 on the entanglement between a macroscopic mechanical oscillator and a magnon mode through the unidirectional cavity coupling.…”