Now at #JapanEUWorkshop, Shuntaro Takeda on A strategy for large-scale optical quantum computing #LTQI Shuntaro Takeda: use a deterministic approach, a loop to increase scalability. Determinism is brought by continuous variable (CV) system, which need 5 gates to be universal: 3 linear, squeezing and cubic gate (the hard one) #LTQI #JapanEUWorkshop

Now at #JapanEUWorkshop , Anthony Laing on Photonic simulations of molecular quantum dynamics #LTQI Anthony Laing essentially looks a photnic simulation of vibrational modes of molecules

Now Erika Kawakami on Capacitive read-out of the Rydberg states towards the realization of a quantum computer
using electrons on helium
#LTQI #JapanEUWorkshop Erika Kawakami: Why use electrons on helium? The system is clean: electrons float in vacuum, far prom nuclear spin and other charges. Electron qubits are 1µm away, which will be useful for surface codes #LTQI #JapanEUWorkshop

Now, Eleni Diamanti on Practical Secure Quantum Communications #JapanEUWorkshop #LTQI Eleni Diamanti: The current solution to secure network links: Symmetric + Asymmetric cryptography. Recent development to fight the threat of quantum computers: postquantum cryptography. Quantum cryptography offers the advantage to be future proof #LTQI

Now, Yoshiro Takahashi from @KyotoU_News on Advanced quantum simulator with novel
spin and orbital degrees of freedom #LTQI @KyotoU_News Yoshihiro Takahashi: With ¹⁷³Yb nuclear spins, we have a SU(6) Fermi-Hubbard model. They observe formation of SU(6) Mott insulator.
#LTQI #JapanEUWorkshop

Now, Christian Groß, on quantum simulation of the Hubbard model, from hidden correlations to magnetic polarons. #LTQI Christian Groß simulates Hubbard model with cold atoms in optical lattices. Li atoms hop with amplitude t. Currently, they only have global control, no local control. #LTQI

Now, Carlo Reita on “Towards scalable silicon quantum computing” #LTQI Carlo Reita‘s work is on quantum dots in Si. The initial state is easy to set using electrostatic gates. The manipulation and the readout are also done with elcetrostatic gates #LTQI

Now, Yoshihis Yamamoto on Physica of Quantum-toClassical Crossover and coherent Ising machines #LTQI Yoshihisa Yamamoto : The goal is to build acelerators for combinatorial an continuous optimization problems. A traditonal quantum computer essentially uses a Grover algorithm and gets a quadratic improvement, but scaling essentailly remains exponential. #LTQI

Now, Philippe Grangier, from @InstitutOptique on Recent progress on continuous variable quantum cryptography #LTQI @InstitutOptique Sadly, I’m on low battery, so I don’t know how long I’ll be able to livetweet Philippe Grangier’s talk #LTQI

Now, Nobuyuki Imoto from @osaka_univ_e on Frequency conversion of single photons emitted from atom/ion quantum memory for telecommunications #LTQI @osaka_univ_e Noboyuki Imoto’s focus is on a global quantum network. It is useful for long haul QKD, the goal is to go beyond the *relayed* quantum network of journals.aps.org/prl/abstract/1… #LTQI

Now, Jörg Wrachtrup, from @IQSTpress on nanoscale quantum measurement
#LTQI @IQSTpress Jörg Wrachtrup: Spins can be used to measure chemical parameters, temperature, mechanical forces (through deformation of hosting Crystal), electric or magnetic fields. #LTQI

Now, Masahiro Kitagawa (Osaka University) on Room temperature nuclear hyperpolarization and quantum encoding for hyper-sensitive NMR and MRI
#LTQI Masahiro Kitagawa: NMR/MRI sensitivity can be increased by a factor ×1000 by combining 3 quantum techniques:
1. Initialization:
Dynamic Nuclear Polarization (DNP) using photoexcited triplet electron.

Now, Frak Wlhelm-MAuch from @Saar_Uni on Quantum Computers in 2018. @Saar_Uni Frank Wilhem-Mauch: Quantum simulation by Trotter uses many gates, and is currently undoable. Using an hybrid classical-quantum algorithm, the variational eigensolver is much better. #LTQI

Now Yasunobu Nakamura from on the “Macroscopic quantum machines” ERATO project jst.go.jp/erato/nakamura…
#LTQI YAsunobu Nakamura will focus on Integrated quantum circuits because of time constraints.
He investigates information quantum thermodynamics in the quantum domain, at a small scale. Fault-tolerant quantum computers look a lot like perpetual quantum machines.

#LTQI

Seated for a seminar by Aephraim Steinberg grom @UofT : How to count one photon and get a result of 1000 – and other experiments on quantum measurement

#LTQI @UofT Aephraim Steinberg’s main question: “Can we ask what a particle was doing before we observed it?”
E.g., a particle can be in one of 3 boxes A, B, C, prepared in superposition A+B. Postselected on a measurement finding it in B+C, what was its probability to be in A?

#LTQI

Now seated for a seminar by Zizhu Wang (王子竹) on
Entanglement and Nonlocality in Infinite 1D Systems (joint work with Sukhwinder Singh, and Miguel Navascués)
arXiv:1608.03485 arxiv.org/abs/1608.03485 / Phys. Rev. Lett. 118, 230401 (2017)
doi.org/10.1103/PhysRe… Zizhu Wang looks at symmetrisation techniques to move between condense-matter n-body systems with no symmetry and infinite translation invariant systems. This procedure works when one only has access to local information
#LTQI

Nows at #MCQS, Rafał Demkowicz-Dobrzański from (@UniWarsawski ) on the grand unified theory of quantum metrology.
#LTQI Rafał Demkowicz-Dobrzański seez quantum metrology as a channel estimation problem. The channel U_φ is given, one optimizes the state sent and the measurement.
#LTQI #MCQS

Now at #MCQS, Andrea Rocchetto, from @UCL @UniofOxford on «Machine learning in quantum information theory, a selection of results» #LTQI @ucl @UniofOxford Andrea Rocchetto defines the PAC (porbabilistically aproximate correct) models, and defines the concept of PAC-learnable: a concept is PAC-learnable iff one can guess a good model for arbitrary input distributions
#LTQI #MCQS

Now at #MCQS, Valentina Parigi from @lkb_lab on Reconfigurable optical implementation of quantum complex networks
#LTQI @lkb_lab .@vparigi81’s synchonously pumped OPO (SPOPO) leads to a complex multimode entanglement structure. She then uses multimode homodyne detection to characterize the corresponding 16-mode covariance matrix.
Eigenmodes found from diagonalization are Hermite-Gauss modes
#LTQI #MCQS

Now Chiara Machiavello from@unipv on “Witnessing quantum capcities of noisy communication channels”
#LTQI #MCQS Chiara Machiavello: a channel has several capacities:
The classical capacity C,
Entanglement assisted classcial capacity C_E,
P private capacity: negligile info can be obtained by a third party
and
Q: Quantum capacity
#LTQI #MCQS

Now at #MCQS, @GerardoAdesso from @UniofNottingham on ""Towards superresolution surface metrology: Quantum estimation of of angular & axial separations"
#LTQI #MCQS @GerardoAdesso @UniofNottingham .@GerardoAdesso teh curs of Raygleigh criterion for high resolution imaging: “two point sources can be resolved by direct imaging if their separation is at least of the order of the width of their point spread function in the image plane”
#LTQI #MCQS