Papers

M. Reiher, N. Wiebe, K. Svore +2 more·May 11, 2016

Significance Our work addresses the question of compelling killer applications for quantum computers. Although quantum chemistry is a strong candidate, the lack of details of how quantum computers can be used for specific applications makes it diffic...

D. Drakova, G. Doyen·May 11, 2016

Long lasting coherence in photosynthetic pigment-protein complexes has been observed even at physiological temperatures. Experiments have demonstrated quantum coherent behaviour in the long-time operation of the D-Wave quantum computer as well. Quant...

M. Guti'errez, Conor Smith, Livia Lulushi +2 more·May 11, 2016

We compare the effect of single qubit incoherent and coherent errors on the logical error rate of the Steane [[7,1,3]] quantum error correction code by performing an exact full-density-matrix simulation of an error correction step. We find that the e...

Alex Bocharov, M. Rötteler, K. Svore·May 9, 2016

We determine the cost of performing Shor's algorithm for integer factorization on a ternary quantum computer, using two natural models of universal fault-tolerant computing: (i) a model based on magic state distillation that assumes the availability...

M. Friesen, J. Ghosh, M. Eriksson +1 more·May 6, 2016

Quantum computing promises significant speed-up for certain types of computational problems. However, robust implementations of semiconducting qubits must overcome the effects of charge noise that currently limit coherence during gate operations. Her...

G. Dvali, César Gómez, D. Lüst +2 more·May 4, 2016

By analyzing the key properties of black holes from the point of view of quantum information, we derive a model‐independent picture of black hole quantum computing. It has been noticed that this picture exhibits striking similarities with quantum cri...

M. Takita, A. Córcoles, E. Magesan +5 more·May 4, 2016

We present parity measurements on a five-qubit lattice with connectivity amenable to the surface code quantum error correction architecture. Using all-microwave controls of superconducting qubits coupled via resonators, we encode the parities of four...

J. Renes·May 4, 2016

The uncertainty principle can be understood as constraining the probability of winning a game in which Alice measures one of two conjugate observables, such as position or momentum, on a system provided by Bob, and he is to guess the outcome. Two var...

R. Namiki, Liang Jiang, Jungsang Kim +1 more·May 2, 2016

We investigate a quantum repeater scheme for quantum key distribution based on the work by Muralidharan et al., Phys. Rev. Lett. 112, 250501 (2014). Our scheme extends that work by making use of error syndrome measurement outcomes available at the re...

M. Bergmann, P. Loock·May 2, 2016

We analyse a generalised quantum error correction code against photon loss where a logical qubit is encoded into a subspace of a single oscillator mode that is spanned by distinct multi-component cat states (coherent-state superpositions). We present...

M. Hartmann·May 2, 2016

Enhancing optical nonlinearities so that they become appreciable on the single photon level and lead to nonclassical light fields has been a central objective in quantum optics for many years. After this has been achieved in individual micro-cavities...

N. Vitanov, A. Rangelov, B. Shore +1 more·May 1, 2016

The technique of stimulated Raman adiabatic passage (STIRAP), which allows efficient and selective population transfer between quantum states without suffering loss due to spontaneous emission, was introduced in 1990 (Gaubatz \emph{et al.}, J. Chem. ...

Jihao Fan, Yonghui Li, Min-Hsiu Hsieh +1 more·May 1, 2016

We present a general framework for the construction of quantum tensor product codes (QTPC). In a classical tensor product code (TPC), its parity check matrix is con- structed via the tensor product of parity check matrices of the two component codes....

G. Kalai·May 1, 2016

Quantum computers are hypothetical devices, based on quantum physics, that would enable us to perform certain computations hundreds of orders of magnitude faster than digital computers. This feature is coined as "quantum supremacy" and one aspect or ...

R. Nigmatullin, C. Ballance, N. D. Beaudrap +1 more·Apr 30, 2016

Optically linked ion traps are promising as components of network-based quantum technologies, including communication systems and modular computers. Experimental results achieved to date indicate that the fidelity of operations within each ion trap m...

V. Bittencourt, A. Bernardini, M. Blasone·Apr 29, 2016

Quantum transition probabilities and quantum entanglement for two-qubit states of a four level trapped ion quantum system are computed for time-evolving ionic states driven by Jaynes-Cummings Hamiltonians with interactions mapped onto a $\mbox{SU}(2)...

Henry Semenenko, T. Byrnes·Apr 29, 2016

Quantum computing implementations under consideration today typically deal with systems with microscopic degrees of freedom such as photons, ions, cold atoms, and superconducting circuits. The quantum information is stored typically in low-dimensiona...

A. Paler, S. Devitt, A. Fowler·Apr 28, 2016

Given a quantum algorithm, it is highly nontrivial to devise an efficient sequence of physical gates implementing the algorithm on real hardware and incorporating topological quantum error correction. In this paper, we present a first step towards th...

D. Ward, Dohun Kim, D. Savage +5 more·Apr 27, 2016

Universal quantum computation requires high-fidelity single-qubit rotations and controlled two-qubit gates. Along with high-fidelity single-qubit gates, strong efforts have been made in developing robust two-qubit logic gates in electrically gated qu...

Thomas Häner, Damian S. Steiger, M. Smelyanskiy +1 more·Apr 21, 2016

As quantum computers of non-trivial size become available in the near future, it is imperative to develop tools to emulate small quantum computers. This allows for validation and debugging of algorithms as well as exploring hardware-software co-desig...