Squeezed state purification with linear optics and feed forward
arXiv:quant-ph/0607080 · doi:10.1103/PhysRevLett.97.053601
Abstract
A scheme for optimal and deterministic linear optical purification of mixed squeezed Gaussian states is proposed and experimentally demonstrated. The scheme requires only linear optical elements and homodyne detectors, and allows the balance between purification efficacy and squeezing degradation to be controlled. One particular choice of parameters gave a ten-fold reduction of the thermal noise with a corresponding squeezing degradation of only 11%. We prove optimality of the protocol, and show that it can be used to enhance the performance of quantum informational protocols such as dense coding and entanglement generation.
4 pages, 3 figures
References in corpus (17)
- Quantum Cryptography
- Teleportation of Quantum States
- Dense Coding for Continuous Variables
- Quantum Dense Coding Exploiting Bright EPR Beam
- Entanglement of formation for symmetric Gaussian states
- An experimental investigation of criteria for continuous variable entanglement
- Experimental Demonstration of Unconditional Entanglement Swapping for Continuous Variables
- High-fidelity teleportation beyond the no-cloning limit and entanglement swapping for continuous variables
- A high-efficiency quantum non-demolition single photon number resolving detector
- Purity of Gaussian states: measurement schemes and time-evolution in noisy channels
- A characterization of continuous variable entanglement
- Unconditional Continuous Variable Dense Coding
- Soliton Squeezing in a Mach-Zehnder Fiber Interferometer
- Sub shot noise phase quadrature measurement of intense light beams
- On improving single photon sources via linear optics and photodetection
- Heralded single-photon generation using imperfect single-photon sources and a two-photon-absorbing medium
- Noiseless phase quadrature amplification via electro-optic feed-forward
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- Generation of quantum states with nonlinear squeezing by Kerr nonlinearity
- Multiple copy distillation and purification of phase diffused squeezed states
- Measurement-induced quantum operations on multiphoton states