The Quantum State of an Ideal Propagating Laser Field

Abstract

We give a quantum information-theoretic description of an ideal propagating CW laser field and reinterpret typical quantum-optical experiments in light of this. In particular we show that contrary to recent claims [T. Rudolph and B. C. Sanders, Phys. Rev. Lett. 87, 077903 (2001)], a conventional laser can be used for quantum teleportation with continuous variables and for generating continuous-variable entanglement. Optical coherence is not required, but phase coherence is. We also show that coherent states play a priveleged role in the description of laser light.

4 pages RevTeX, to appear in PRL. For an extended version see quant-ph/0111157

References in corpus (2)

• Requirement of optical coherence for continuous-variable quantum teleportation
• The physical meaning of phase and its importance for quantum teleportation

Cited by in corpus (56)

• Reference frames, superselection rules, and quantum information
• Catalytic Coherence
• Quantum scissors: teleportation of single-mode optical states by means of a nonlocal single photon
• Quantum Mechanics as Quantum Information (and only a little more)
• Robust entanglement of a micromechanical resonator with output optical fields
• Review of Entangled Coherent States
• QBism, the Perimeter of Quantum Bayesianism
• On experimental procedures for entanglement verification
• Phase estimation for thermal Gaussian states
• Unambiguous State Discrimination of Coherent States with Linear Optics: Application to Quantum Cryptography
• Nonclassical Light and Metrological Power: An Introductory Review
• Concepts of work in autonomous quantum heat engines
• Dialogue Concerning Two Views on Quantum Coherence: Factist and Fictionist
• Photon-number superselection and the entangled coherent-state representation
• Decoherence-full subsystems and the cryptographic power of a private shared reference frame
• Quantifying the resource of sharing a reference frame
• Continuous-variable dense coding by optomechanical cavities
• Inducing Non-Classical Lasing Via Periodic Drivings in Circuit Quantum Electrodynamics
• Entanglement under restricted operations: Analogy to mixed-state entanglement
• QBism: Quantum Theory as a Hero's Handbook
• Coherence cost for violating conservation laws
• Better Randomness with Single Photons
• Defending Continuous Variable Teleportation: Why a laser is a clock, not a quantum channel
• Continuous-Variable Quantum Teleportation with a Conventional Laser
• Continuous-Variable Quantum Teleportation with a Conventional Laser (Rev. Ver.)
• Entanglement and Symmetry: A Case Study in Superselection Rules, Reference Frames, and Beyond
• Applications of Coherent Population Transfer to Quantum Information Processing
• Spacetime effects on wavepackets of coherent light
• Boosting quantum key distribution via the end-to-end loss control
• Artificial coherent states of light by multi-photon interference in a single-photon stream
• Quantum metrology using time-frequency as quantum continuous variables: Resources, sub shot-noise precision and phase space representation
• Quantum nature of laser light
• Decoherence of a two-state atom driven by coherent light
• Time-separated entangled light pulses from a single-atom emitter
• Absence of quantum optical coherence in high harmonic generation
• Forty Thousand Kilometers Under Quantum Protection
• Quantum communication, reference frames and gauge theory
• Disentanglement of Source and Target and the Laser Quantum State
• Generating quantum discord between two distant Bose-Einstein condensates with Bell-like detection
• Quantum Bayesian methods and subsequent measurements
• There is no unmet requirement of optical coherence for continuous-variable quantum teleportation
• On the Quantum Phase Operator for Coherent States
• Violating Bell inequality using weak coherent states
• Numerical Bayesian state assignment for a three-level quantum system. I. Absolute-frequency data; constant and Gaussian-like priors
• Phase measurements with weak reference pulses
• Describing squeezed-light experiments without squeezed-light states
• Optical homodyne detection in view of joint probability distribution
• Quantum analysis of the direct measurement of light waves
• Describing two-mode squeezed-light experiments without two-mode entanglement or squeezing
• Quantum state features of the FEL radiation from the occupation number statistics
• Mutual first order coherence of phase-locked lasers
• Optical Single Photons on Demand Teleported from Microwave Cavities
• Teleportation of Continuous Quantum Variables: A New Approach
• Generation and Manipulation of Entanglement in Quantum Optical Systems
• Basis entropy: A useful physical quantity about projective measurement
• On the coherence veryfication of the continuous variable state in Fock space