Abstract: A method of simulating a quantum computation is provided. The method includes determining, by a first system (110) including one r more first processing units (112), a size parameter of a quantum computation. The quantum computation is configured for solving a computational problem. The size parameter is characteristic of an input size of the computational problem. The method includes communicating, by the first system, the size parameter to a second system (120) including one or more second processing units (122). The method includes communicating, by the second system, a computational key to the first system, wherein the computational key is based on the size parameter of the quantum computation. The method includes performing, by the first system, a simulation of the quantum computation based on the computational key.

Abstract: An architecture for fault-tolerant universal quantum computation is suited for matter qubits, such as donor qubits in silicon, coupled by a network of photonic interconnects. The basic operational building blocks are local measurements and unitaries, plus an entangling measurement of non-local Pauli operators. 3D graph states created by applying deterministic entangling measurements to pairs of qubits in knitting and fusion processes to yield resource states for one way computing. The deterministic entangling measurements are facilitated by configuring the network with active switches to allow single photons to interact with pairs of matter qubits.

Abstract: A modular quantum computer architecture is developed with a hierarchy of interactions that can scale to very large numbers of qubits. Local entangling quantum gates between qubit memories within a single modular register are accomplished using natural interactions between the qubits, and entanglement between separate modular registers is completed via a probabilistic photonic interface between qubits in different registers, even over large distances. This architecture is suitable for the implementation of complex quantum circuits utilizing the flexible connectivity provided by a reconfigurable photonic interconnect network. The subject architecture is made fault-tolerant which is a prerequisite for scalability.

Abstract: A modular quantum computer architecture is developed with a hierarchy of interactions that can scale to very large numbers of qubits. Local entangling quantum gates between qubit memories within a single modular register are accomplished using natural interactions between the qubits, and entanglement between separate modular registers is completed via a probabilistic photonic interface between qubits in different registers, even over large distances. This architecture is suitable for the implementation of complex quantum circuits utilizing the flexible connectivity provided by a reconfigurable photonic interconnect network. The subject architecture is made fault-tolerant which is a prerequisite for scalability.

Abstract: A modular quantum computer architecture is developed with a hierarchy of interactions that can scale to very large numbers of qubits. Local entangling quantum gates between qubit memories within a single modular register are accomplished using natural interactions between the qubits, and entanglement between separate modular registers is completed via a probabilistic photonic interface between qubits in different registers, even over large distances. This architecture is suitable for the implementation of complex quantum circuits utilizing the flexible connectivity provided by a reconfigurable photonic interconnect network. The subject architecture is made fault-tolerant which is a prerequisite for scalability.

Abstract: A method for quantum computing uses entangled resource states which include in particular a class of highly entangled multi-particle states. These so-called cluster states can serve as a quantum computer. The resource states can be implemented with ultra-cold atoms in optical lattices or similar systems. A universal set of quantum gates, the CNOT gate and arbitrary one-system rotations, can be implemented by performing one-system measurements only. Further, a way of quantum information processing beyond the network scheme is provided.

Abstract: A method for quantum computing uses entangled resource states which include in particular a class of highly entangled multi-particle states. These so-called cluster states can serve as a quantum computer. The resource states can be implemented with ultra-cold atoms in optical lattices or similar systems. A universal set of quantum gates, the CNOT gate and arbitrary one-system rotations, can be implemented by performing one-system measurements only. Further, a way of quantum information processing beyond the network scheme is provided.