Linear optical quantum computing with photonic qubits
- P. Kok, W. Munro, K. Nemoto, T. Ralph, J. Dowling, G. Milburn
- Physics
- 24 January 2007
Linear optics with photon counting is a prominent candidate for practical quantum computing. The protocol by Knill, Laflamme, and Milburn [2001, Nature (London) 409, 46] explicitly demonstrates that…
On the measurement of qubits
- D. James, P. Kwiat, W. Munro, Andrew G. White
- Physics
- 21 March 2001
We describe in detail the theory underpinning the measurement of density matrices of a pair of quantum two-level systems (“qubits”). Our particular emphasis is on qubits realized by the two…
Nearly deterministic linear optical controlled-NOT gate.
The key element of this gate is nondemolition detectors that use a weak cross-Kerr nonlinearity effect to conditionally generate a phase shift on a coherent probe if a photon is present in the signal mode.
Quantum error correction for beginners
The basic aspects of quantum error correction and fault-tolerance are examined largely through detailed examples, which are more relevant to experimentalists today and in the near future.
Quantum computation with optical coherent states
- T. Ralph, A. Gilchrist, G. Milburn, W. Munro, S. Glancy
- PhysicsQuantum Electronics and Laser Science Conference
- 19 May 2002
Summary form only given. We discuss an efficient scheme which is elegant in its simplicity. By encoding the quantum information in multi-photon coherent states, rather than single photon states,…
Qudit quantum-state tomography
Recently quantum tomography has been proposed as a fundamental tool for prototyping a few qubit quantum device. It allows the complete reconstruction of the state produced from a given input into the…
Weak nonlinearities: a new route to optical quantum computation
- W. Munro, K. Nemoto, T. Spiller
- Physics
- 1 May 2005
This work presents a new route for distributed optical QIP, based on generalized quantum non-demolition measurements, providing a unified approach for quantum communication and computing.
Hybrid quantum repeater using bright coherent light.
- P. van Loock, T. Ladd, Y. Yamamoto
- PhysicsPhysical Review Letters
- 26 October 2005
A quantum repeater protocol for long-distance quantum communication that creates entanglement between qubits at intermediate stations of the channel by using a weak dispersive light-matter interaction and distributing the outgoing bright coherent-light pulses among the stations.
Inside Quantum Repeaters
- W. Munro, Koji Azuma, K. Tamaki, K. Nemoto
- PhysicsIEEE Journal of Selected Topics in Quantum…
- 15 January 2015
Most quantum communication tasks need to rely on the transmission of quantum signals over long distances. Unfortunately, transmission of such signals is most often limited by losses in the channel,…
Quantum metrology with entangled coherent states.
- J. Joo, W. Munro, T. Spiller
- PhysicsPhysical Review Letters
- 26 January 2011
We present an improved phase estimation scheme employing entangled coherent states and demonstrate that these states give the smallest variance in the phase parameter in comparison to NOON, "bat,"…
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