機械的振動器と光学空洞モードの量子相関結合
E Verhagen1, S Deléglise, S Weis
1Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
Nature
|February 3, 2012
まとめ
研究者は,光学光子とマイクロ機械的振動器の間の量子相関結合を達成しました. この画期的な発見により,量子状態の移転と冷却が可能になり,新たな量子技術への道が開けています.
科学分野:
- 量子物理学とは,量子物理学のことです.
- オプトメカニクス オプトメカニクス
- ナノテクノロジー ナノテクノロジー
背景:
- 光学レーザーフィールドは,原子や分子システムの量子制御を可能にします.
- オプトメカニカルシステムは,放射線圧力を介して光と機械運動を組み合わせます.
- 量子一貫性カップリングには,カップリング比率が非一貫性比率を超える必要がある.
研究 の 目的:
- 光学フォトンとマイクロメカニカルオシレータの量子一貫性カップリングを実現するために.
- オプトメカニカルシステムにおける量子状態の移転と冷却を実証する.
- 機械的な振動器と光学フォトンの間の効率的な量子インターフェースを確立する.
主な方法:
- オプトメカニカルコップリングを強化するために設計された光学腔.
- 光学自由度と機械自由度間のパラメトリックカップリングのための利用された放射線圧.
- 量子一貫性カップリングを達成するためにシステムを操作し,デコエレンス率を超えました.
主要な成果:
- 光学フォトンとマイクロメカニカルオシレータの間の量子一貫性カップリングを達成しました.
- 機械的振動器を平均1.7 ± 0.1の運動量子まで冷却した.
- 光学光場と微機械振動器の間のエネルギー交換が,サブ量子レベルで実証された.
結論:
- 開発されたオプトメカニカルシステムは,効率的な量子インターフェースとして機能します.
- このインターフェースは,光ファイバー経由で量子状態の非相関性輸送を容易にする.
- この発見は,機械振動器を量子トランスデューサーとして,またはマイクロ波から光学量子リンクとして使用するためのルートを開きます.
関連する概念動画
02:45The Quantum-Mechanical Model of an Atom
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...
01:07Damped Oscillations
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Although friction and other non-conservative...
01:06Forced Oscillations
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
01:11Atomic Nuclei: Larmor Precession Frequency
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
01:30Oscillations In An LC Circuit
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
01:28Standing Waves in a Cavity
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by: