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Heisenberg-Limited Qubit Read-Out with Two-Mode Squeezed Light
Nicolas Didier1,2, Archana Kamal3, William D Oliver3,4
1Department of Physics, McGill University, 3600 rue University, Montreal, Quebec H3A 2T8, Canada.
Physical Review Letters
|September 16, 2015
Summary
We demonstrate a method using two-mode squeezed light to significantly improve cavity-based dispersive qubit measurements. This technique achieves Heisenberg-limited scaling without requiring small couplings or long measurement times.
Area of Science:
- Quantum optics
- Quantum information science
- Cavity quantum electrodynamics
Background:
- Dispersive qubit measurement is crucial for quantum computing.
- Current methods face limitations in scaling and speed.
- Enhancing measurement fidelity and efficiency is a key challenge.
Purpose of the Study:
- To introduce a novel scheme for exponentially enhancing dispersive qubit measurement.
- To achieve true Heisenberg-limited scaling for qubit readout.
- To overcome limitations of existing measurement techniques.
Main Methods:
- Utilizing two-mode squeezed light.
- Coupling a qubit dispersively to two cavities.
- Exploiting a quantum-mechanics-free subsystem symmetry in joint cavity quadratures.
Main Results:
- Demonstrated exponential enhancement of cavity-based dispersive qubit measurement.
- Achieved true Heisenberg-limited scaling.
- Scheme is robust against small dispersive couplings and long measurement times.
Conclusions:
- The proposed method offers a significant advancement in qubit measurement techniques.
- It provides a pathway towards more efficient and scalable quantum information processing.
- The scheme is implementable in realistic systems like circuit quantum electrodynamics.
