154 citations · 648 across the 13 of their papers we have counts for
13 papers
Quantum-limited measurements of intensity noise levels in Yb-doped fiber amplifiers
Alexandra Popp, Victor Distler, Kevin Jaksch +7
We investigate the frequency-resolved intensity noise spectrum of an Yb-doped fiber amplifier down to the fundamental limit of quantum noise. We focus on the kHz and low MHz freque…
The Standard Quantum Limit of Coherent Beam Combining
C. R. Muller, F. Sedlmeir, V. O. Martynov +2
Coherent beam combining refers to the process of generating a bright output beam by merging independent input beams with locked relative phases. We report the first quantum mechani…
Binary Homodyne Detection for Observing Quadrature Squeezing in Satellite Links
Christian R. Müller, Kaushik P. Seshadreesan, Christian Peuntinger +1
Optical satellite links open up new prospects for realizing quantum physical experiments over unprecedented length scales. We analyze and affirm the feasibility of detecting quantu…
Joint measurement of complementary observables in moment tomography
Yong Siah Teo, Christian R. Muller, Hyunseok Jeong +3
Wigner and Husimi quasi-distributions, owing to their functional regularity, give the two archetypal and equivalent representations of all observable-parameters in continuous-varia…
Quantum-limited measurements of optical signals from a geostationary satellite
Kevin Günthner, Imran Khan, Dominique Elser +13
The measurement of quantum signals that traveled through long distances is of fundamental and technological interest. We present quantum-limited coherent measurements of optical si…
Evading Vacuum Noise: Wigner Projections or Husimi Samples?
Christian R. Müller, Christian Peuntinger, Thomas Dirmeier +8
The accuracy in determining the quantum state of a system depends on the type of measurement performed. Homodyne and heterodyne detection are the two main schemes in continuous-var…
A robust quantum receiver for phase shift keyed signals
Christian R. Müller, Christoph Marquardt
The impossibility of perfectly discriminating non orthogonal quantum states imposes far-reaching consequences both on quantum and classical communication schemes. We propose and nu…
Distribution of squeezed states through an atmospheric channel
Christian Peuntinger, Bettina Heim, Christian R. Müller +3
Continuous variable quantum states of light are used in quantum information protocols and quantum metrology and known to degrade with loss and added noise. We were able to show the…
Multipolar hierarchy of efficient quantum polarization measures
P. de la Hoz, A. B. Klimov. G. Bjork, Y. -H. Kim +4
We advocate a simple multipole expansion of the polarisation density matrix. The resulting multipoles appear as successive moments of the Stokes variables and can be obtained from…
QPSK coherent state discrimination via a hybrid receiver
Christian R. Müller, Mario A. Usuga, Christoffer Wittmann +4
We propose and experimentally demonstrate a near-optimal discrimination scheme for the quadrature phase shift keying protocol (QPSK). We show in theory that the performance of our…
Quantum polarization tomography of bright squeezed light
C. R. Muller, B. Stoklasa, C. Gabriel +7
We reconstruct the polarization sector of a bright polarization squeezed beam starting from a complete set of Stokes measurements. Given the symmetry that underlies the polarizatio…
Probabilistic Cloning of Coherent States without a Phase Reference
Christian R. Müller, Christoffer Wittmann, Petr Marek +4
We present a probabilistic cloning scheme operating independently of any phase reference. The scheme is based solely on a phase-randomized displacement and photon counting, omittin…
Noise-Powered Probabilistic Concentration of Phase Information
Mario A. Usuga, Christian R. Mueller, Christoffer Wittmann +5
Phase insensitive optical amplification of an unknown quantum state is known to be a fundamentally noisy operation that inevitably adds noise to the amplified state [1 - 5]. Howeve…