Related Experiment Video
Updated: Apr 23, 2026
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
8.9K
Quantum-limited amplification and entanglement in coupled nonlinear resonators
Physical Review Letters
|September 27, 2014
Summary
We developed a Bose-Hubbard dimer for quantum-limited amplification and frequency-entangled microwave fields. This novel device offers flexible operation and significant potential for quantum simulations.
Area of Science:
- Quantum optics
- Cavity quantum electrodynamics
- Solid-state physics
Background:
- Parametric amplifiers are crucial for quantum information processing.
- Previous implementations faced limitations in tunability and operational flexibility.
- Bose-Hubbard models are fundamental for studying quantum many-body phenomena.
Purpose of the Study:
- To demonstrate a novel Bose-Hubbard dimer for quantum-limited amplification.
- To generate frequency-entangled microwave fields with high squeezing parameters.
- To explore the potential of this system in quantum simulations.
Main Methods:
- Utilizing a coupled cavity realization of a Bose-Hubbard dimer.
- Operating the dimer as both a degenerate and nondegenerate amplifier.
- Employing lumped element circuits for flexible parameter control.
Main Results:
- Achieved quantum-limited amplification with squeezing parameters below -12 dB.
- Generated frequency-entangled microwave fields.
- Measured a gain-bandwidth product exceeding 250 MHz in nondegenerate operation.
- Observed saturation at high input photon numbers (2000 per μs).
Conclusions:
- The demonstrated Bose-Hubbard dimer offers superior performance and flexibility compared to previous parametric amplifiers.
- The system exhibits wide frequency tunability (approx. 2 GHz) and potential for further improvement.
- This dimer serves as a promising elementary cell for nonlinear cavity arrays in quantum simulations.
Related Concept Videos
01:12Double Resonance Techniques: Overview
867
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
867
01:27¹H NMR: Long-Range Coupling
2.4K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.4K
01:14Sound Waves: Resonance
2.8K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
2.8K
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.2K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.2K
01:23Parallel Resonance
847
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
847
01:19Concept of Resonance and its Characteristics
5.4K
If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
5.4K