Quantum Filtering of Optical Coherent States

Abstract

We propose and experimentally demonstrate non-destructive and noiseless removal (filtering) of vacuum states from an arbitrary set of coherent states of continuous variable systems. Errors i.e. vacuum states in the quantum information are diagnosed through a weak measurement, and on that basis, probabilistically filtered out. We consider three different filters based on on/off detection phase stabilized and phase randomized homodyne detection. We find that on/off etection, optimal in the ideal theoretical setting, is superior to the homodyne strategy in a practical setting.

6 pages, 5 figures

References in corpus (15)

• Quantum Cryptography
• Quantum key distribution using gaussian-modulated coherent states
• Unconditional optimality of Gaussian attacks against continuous-variable QKD
• Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography
• Non-gaussian statistics from individual pulses of squeezed light
• Entanglement purification of Gaussian continuous variable quantum states
• Experimental demonstration of continuous variable purification of squeezed states
• Experimental distillation of squeezing from non-Gaussian quantum states
• Efficiency of coherent state quantum cryptography in the presence of loss: Influence of realistic error correction
• Pulsed squeezed vacuum characterization without homodyning
• Practical purification scheme for decohered coherent-state superpositions via partial homodyne detection
• Interferometry as a binary decision problem
• Improving quantum interferometry by using entanglement (to take a decision you'd better use entanglement)
• Unambiguous quantum state filtering
• Practical scheme for the optimal measuremnet in quantum interferometric devices

Cited by in corpus (11)

• A No-Go Theorem for Gaussian Quantum Error Correction
• Entanglement of Gaussian states and the applicability to quantum key distribution over fading channels
• Atmospheric continuous-variable quantum communication
• Feasibility of free space quantum key distribution with coherent polarization states
• Quantum optical coherence can survive photon losses: a continuous-variable quantum erasure correcting code
• Atmospheric Channel Characteristics for Quantum Communication with Continuous Polarization Variables
• Continuous variable entanglement distillation of Non-Gaussian Mixed States
• Tests of multimode quantum non-locality with homodyne measurements
• Work and information from thermal states after subtraction of energy quanta
• Classical simulability of constant-depth linear-optical circuits with noise
• Quantum noise eater for a single photonic qubit