TY - JOUR AU - M. Bishof AU - X. Zhang AU - M. Martin AU - Jun Ye BT - Physical Review Letters DA - 2013-08 DO - 10.1103/PhysRevLett.111.093604 PY - 2013 EP - 093604 T2 - Physical Review Letters TI - Optical Spectrum Analyzer with Quantum-Limited Noise Floor UR - http://link.aps.org/doi/10.1103/PhysRevLett.111.093604 VL - 111 SN - 0031-9007 ER -