Efficient optical quantum information processing

Abstract

Quantum information offers the promise of being able to perform certain communication and computation tasks that cannot be done with conventional information technology (IT). Optical Quantum Information Processing (QIP) holds particular appeal, since it offers the prospect of communicating and computing with the same type of qubit. Linear optical techniques have been shown to be scalable, but the corresponding quantum computing circuits need many auxiliary resources. Here we present an alternative approach to optical QIP, based on the use of weak cross-Kerr nonlinearities and homodyne measurements. We show how this approach provides the fundamental building blocks for highly efficient non-absorbing single photon number resolving detectors, two qubit parity detectors, Bell state measurements and finally near deterministic control-not (CNOT) gates. These are essential QIP devices

Accepted to the Journal of optics B special issue on optical quantum computation; References updated

References in corpus (9)

• Measurement of conditional phase shifts for quantum logic
• A near deterministic linear optical CNOT gate
• Experimental Controlled-NOT Logic Gate for Single Photons in the Coincidence Basis
• Realization of a photonic CNOT gate sufficient for quantum computation
• Generation of entangled coherent states via cross phase modulation in a double electromagnetically induced transparency regime
• Single-photon quantum nondemolition detectors constructed with linear optics and projective measurements
• Measurement-induced Nonlinearity in Linear Optics
• Optical Fock-state synthesizer
• Optical Bell Measurement by Fock Filtering

Cited by in corpus (26)

• Quantum Computation by Communication
• Quantum computation using weak nonlinearities: robustness against decoherence
• Coherent Population Trapping of Electron Spins in a Semiconductor
• The efficiencies of generating cluster states with weak non-linearities
• Experimental realization of nondestructive discrimination of Bell states using a five-qubit quantum computer
• Experimental implementation of the optimal linear-optical controlled phase gate
• A search algorithm for quantum state engineering and metrology
• Breakdown of the cross-Kerr scheme for Photon Counting
• Loss in hybrid qubit-bus couplings and gates
• Highly Efficient Processing Multi-photon States
• Weak non-linearities and cluster states
• On photonic controlled phase gates
• Nondestructive discrimination of a new family of highly entangled states in IBM quantum computer
• Reduce, reuse, recycle, for robust cluster state generation
• Exploration of photon-number entangled states using weak nonlinearities
• Single photon quantum non-demolition in the presence of inhomogeneous broadening
• Unambiguous atomic Bell measurement assisted by multiphoton states
• Preparation of Knill-Laflamme-Milburn states using tunable controlled phase gate
• Universal quantum computation by the unitary control of ancilla qubits and using a fixed ancilla-register interaction
• Ancilla-driven quantum computation for qudits and continuous variables
• Quantum computation mediated by ancillary qudits and spin coherent states
• Multiple multi-control unitary operations: implementation and applications
• Low error measurement-free phase gates for qubus computation
• Measurement-Based Control for Minimizing Energy Functions in Quantum Systems
• Structure of the Phase in Pure Two-Mode Gaussian States
• Relative resilience to noise of standard and sequential approaches to measurement-based quantum computation