We report on the coherent internal-state control of single crystalline
nanodiamonds, containing on average 1200 nitrogen-vacancy (NV) centers,
embedded in three-dimensional direct-laser-written waveguides. We excite the NV
centers by light propagating through the waveguide, and we show that emitted
fluorescence can be efficiently coupled to the waveguide modes. We find an
average coupling efficiency of 21.6% into all guided modes. Moreover, we
investigate optically-detected magnetic-resonance spectra as well as Rabi

Many applications of quantum simulation require to prepare and then
characterize quantum states by performing an efficient partial tomography to
estimate observables corresponding to $k$-body reduced density matrices
($k$-RDMs). For instance, variational algorithms for the quantum simulation of
chemistry usually require that one measure the fermionic 2-RDM. While such
marginals provide a tractable description of quantum states from which many
important properties can be computed, their determination often requires a

We show how to generate quasi-rectangle-states of the vibrational motion of
an ion, this is, states that have the same probability in a given position
interval. We produce those states by repeated ion-laser interactions followed
by conditional measurements that generate a superposition of squeezed states.
The squeeze parameter of the initial state may be tuned in order to obtain such
highly localized rectangle states.

Author(s): E. T. Khabiboulline, J. Borregaard, K. De Greve, and M. D. Lukin
Quantum networks provide a platform for astronomical interferometers capable of imaging faint stellar objects. In a recent work [E. T. Khabiboulline et al., Phys. Rev. Lett. 123, 070504 (2019)], we presented a protocol that circumvents transmission losses with efficient use of quantum resources and...
[Phys. Rev. A 100, 022316] Published Thu Aug 15, 2019

Author(s): Marc-Olivier Renou, Yuyi Wang, Sadra Boreiri, Salman Beigi, Nicolas Gisin, and Nicolas Brunner
A quantum network consists of independent sources distributing entangled states to distant nodes which can then perform entangled measurements, thus establishing correlations across the entire network. But how strong can these correlations be? Here we address this question, by deriving bounds on pos...
[Phys. Rev. Lett. 123, 070403] Published Thu Aug 15, 2019

Author(s): F. E. S. Steinhoff
Multipartite pure states are equivalent under stochastic local operations and classical communication (SLOCC) whenever they can be mapped into one another by invertible local operations. It is shown that this is equivalent to the interconvertibility through finite sequences of elementary local opera...
[Phys. Rev. A 100, 022317] Published Thu Aug 15, 2019

Author(s): Shanshan Ding and Shizhong Zhang
We study the Fermi liquid properties of a single component Fermi gas with $p$-wave interactions. In the weak repulsive limit, we obtain exact perturbative expansions for the ground state energy, the chemical potential, and the effective mass of the Landau quasiparticle up to second order in scatteri...
[Phys. Rev. Lett. 123, 070404] Published Thu Aug 15, 2019

Author(s): E. T. Khabiboulline, J. Borregaard, K. De Greve, and M. D. Lukin
We propose a method for optical interferometry in telescope arrays assisted by quantum networks. In our approach, the quantum state of incoming photons along with an arrival time index are stored in a binary qubit code at each receiver. Nonlocal retrieval of the quantum state via entanglement-assist...
[Phys. Rev. Lett. 123, 070504] Published Thu Aug 15, 2019

Author(s): Yi-Han Luo, Han-Sen Zhong, Manuel Erhard, Xi-Lin Wang, Li-Chao Peng, Mario Krenn, Xiao Jiang, Li Li, Nai-Le Liu, Chao-Yang Lu, Anton Zeilinger, and Jian-Wei Pan
The first experiment to teleport qutrits rather than qubits paves the way to teleporting the complete quantum state of a particle.
[Phys. Rev. Lett. 123, 070505] Published Thu Aug 15, 2019

The study of ontology (hidden variables) provides for a vital ground on which
significant non-classical features of quantum theory are revealed. One such
non-classical ontic-feature is preparation contextuality (PC) and advantage in
oblivious communication tasks is one of its operational signatures. This
article primarily pursues the ontic-feature underlying quantum advantage in
communication complexity (CC). We construct oblivious communication tasks