Demonstration of atomic frequency comb memory for light with spin-wave storage (2009)
Afzelius, Mikael, Usmani, Imam, Amari, Atia, Lauritzen, Björn, Walther, Andreas, Simon, Christoph, ...
We present a light-storage experiment where the light is mapped onto an inhomogeneously broadened optical transition in a praseodymium-doped crystal, which is shaped into an atomic frequency comb....
Solid state quantum memory for photons at telecommunication wavelengths (2009)
Lauritzen, Björn, Minář, Jiří, De Riedmatten, Hugues, Afzelius, Mikael, Sangouard, Nicolas, Simon, Christoph, ...
We demonstrate experimentally a solid-state quantum memory for photons at telecommunication wavelengths. Weak light fields at the single photon level are stored for a time up to 600 ns in an...
Electric control of collective atomic coherence in an Erbium doped solid (2009)
Minář, Jiří, Lauritzen, Björn, De Riedmatten, Hugues, Afzelius, Mikael, Simon, Christoph, Gisin, Nicolas
We demonstrate fast and accurate control of the evolution of collective atomic coherences in an Erbium doped solid using external electric fields. This is achieved by controlling the inhomogeneous...
Quantum repeaters based on atomic ensembles and linear optics (2009)
Sangouard, Nicolas, Simon, Christoph, De Riedmatten, Hugues, Gisin, Nicolas
The distribution of quantum states over long distances is limited by photon loss. Straightforward amplification as in classical telecommunications is not an option in quantum communication because of...
Ottaviani, Carlo, Simon, Christoph, De Riedmatten, Hugues, Afzelius, Mikael, Lauritzen, Bjoern, Sangouard, Nicolas, ...
The creation of single collective excitations in atomic ensembles via spontaneous Raman emission plays a key role in several quantum communication protocols, starting with the seminal DLCZ protocol...
A solid state light-matter interface at the single photon level (2008)
De Riedmatten, Hugues, Afzelius, Mikael, Staudt, Matthias, Simon, Christoph, Gisin, Nicolas
Coherent and reversible mapping of quantum information between light and matter is an important experimental challenge in quantum information science. In particular, it is a decisive milestone for...
Multi-Mode Quantum Memory based on Atomic Frequency Combs (2008)
Afzelius, Mikael, Simon, Christoph, De Riedmatten, Hugues, Gisin, Nicolas
An efficient multi-mode quantum memory is a crucial resource for long-distance quantum communication based on quantum repeaters. We propose a quantum memory based on spectral shaping of an...
Robust and Efficient Quantum Repeaters with Atomic Ensembles and Linear Optics (2008)
Sangouard, Nicolas, Simon, Christoph, Zhao, Bo, Chen, Yu-Ao, De Riedmatten, Hugues, Pan, Jian-Wei, ...
In the last few years there has been a lot of interest in quantum repeater protocols using only atomic ensembles and linear optics. Here we show that the local generation of high-fidelity entangled...
Phase noise measurements in long fiber interferometers for quantum repeaters applications (2007)
Minář, Jiří, De Riedmatten, Hugues, Simon, Christoph, Zbinden, Hugo, Gisin, Nicolas
Many protocols for long distance quantum communication require interferometric phase stability over long distances of optical fibers. In this paper we investigate the phase noise in long optical...
Long-Distance Entanglement Distribution with Single-Photon Sources (2007)
Sangouard, Nicolas, Simon, Christoph, Minar, Jiri, Zbinden, Hugo, De Riedmatten, Hugues, Gisin, Nicolas
We present an efficient architecture for quantum repeaters based on single-photon sources in combination with quantum memories for photons. Errors inherent to previous repeater protocols using...
Laurat, Julien, Chou, Chin-wen, Deng, Hui, Choi, Kyung Soo, Felinto, Daniel, De Riedmatten, Hugues, ...
We present a protocol for performing entanglement connection between pairs of atomic ensembles in the single excitation regime. Two pairs are prepared in an asynchronous fashion and then connected...
Functional Quantum Nodes for Entanglement Distribution over Scalable Quantum Networks (2007)
Chou, Chin-Wen, Laurat, Julien, Deng, Hui, Choi, Kyung Soo, De Riedmatten, Hugues, Felinto, Daniel, ...
We demonstrate entanglement distribution between two remote quantum nodes located 3 meters apart. This distribution involves the asynchronous preparation of two pairs of atomic memories and the...
Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories (2007)
Simon, Christoph, De Riedmatten, Hugues, Afzelius, Mikael, Sangouard, Nicolas, Zbinden, Hugo, Gisin, Nicolas
We propose a quantum repeater protocol which builds on the well-known DLCZ protocol [L.M. Duan, M.D. Lukin, J.I. Cirac, and P. Zoller, Nature 414, 413 (2001)], but which uses photon pair sources in...
Efficient retrieval of a single excitation stored in an atomic ensemble (2006)
Laurat, Julien, De Riedmatten, Hugues, Felinto, Daniel, Chou, Chin-wen, Schomburg, Erik, Kimble, H. Jeff
We report significant improvements in the retrieval efficiency of a single excitation stored in an atomic ensemble and in the subsequent generation of strongly correlated pairs of photons. A 50%...
Efficient retrieval of a single excitation stored in an atomic ensemble (2006)
Laurat, Julien, De Riedmatten, Hugues, Felinto, Daniel, Chou, Chin-wen, Schomburg, Erik, Kimble, H. Jeff
We report significant improvements in the retrieval efficiency of a single excitation stored in an atomic ensemble and in the subsequent generation of strongly correlated pairs of photons. A 50%...
Efficient retrieval of a single excitation stored in an atomic ensemble (2006)
Laurat, Julien, De Riedmatten, Hugues, Felinto, Daniel, Chou, Chin-wen, Schomburg, Erik, Kimble, H. Jeff
We report significant improvements in the retrieval efficiency of a single excitation stored in an atomic ensemble and in the subsequent generation of strongly correlated pairs of photons. A 50%...
Efficient retrieval of a single excitation stored in an atomic ensemble (2006)
Laurat, Julien, De Riedmatten, Hugues, Felinto, Daniel, Chou, Chin-wen, Schomburg, Erik, Kimble, H. Jeff
We report significant improvements in the retrieval efficiency of a single excitation stored in an atomic ensemble and in the subsequent generation of strongly correlated pairs of photons. A 50%...
Four-photon correction in two-photon Bell experiments (2004)
Scarani, Valerio, De Riedmatten, Hugues, Marcikic, Ivan, Zbinden, Hugo, Gisin, Nicolas
Correlated photons produced by spontaneous parametric down-conversion are an essential tool for quantum communication, especially suited for long-distance connections. To have a reasonable count rate...
Quantum Relays for Long Distance Quantum Cryptography (2003)
Collins, Daniel, Gisin, Nicolas, De Riedmatten, Hugues
Quantum Cryptography is on the verge of commercial application. One of its greatest limitations is over long distance - secret key rates are low and the longest fibre over which any key has been...
De Riedmatten, Hugues, Scarani, Valerio, Marcikic, Ivan, Acin, Antonio, Tittel, Wolfgang, Zbinden, Hugo, ...
We study the physics of four-photon states generated in spontaneous parametric down-conversion with a pulsed pump field. In the limit where the coherence time of the photons t_c is much shorter than...
Tailoring photonic entanglement in high-dimensional Hilbert spaces (2003)
De Riedmatten, Hugues, Marcikic, Ivan, Scarani, Valerio, Tittel, Wolfgang, Zbinden, Hugo, Gisin, Nicolas
We present an experiment where two photonic systems of arbitrary dimensions can be entangled. The method is based on spontaneous parametric down conversion with trains of d pump pulses with a fixed...
Femtosecond Time-Bin Entangled Qubits for Quantum Communication (2002)
Marcikic, Ivan, De Riedmatten, Hugues, Tittel, Wolfgang, Scarani, Valerio, Zbinden, Hugo, Gisin, Nicolas
We create pairs of non-degenerate time-bin entangled photons at telecom wavelengths with ultra-short pump pulses. Entanglement is shown by performing Bell kind tests of the Franson type with...
Creating high dimensional time-bin entanglement using mode-locked lasers (2002)
De Riedmatten, Hugues, Marcikic, Ivan, Zbinden, Hugo, Gisin, Nicolas
We present a new scheme to generate high dimensional entanglement between two photonic systems. The idea is based on parametric down conversion with a sequence of pump pulses generated by a...