Information Free Quantum Bus for Generating Stabiliser States

Abstract

Efficient generation of spatially delocalised entangled states is at the heart of quantum information science. Generally flying qubits are proposed for long range entangling interactions, however here we introduce a busmediated alternative for this task. Our scheme permits efficient and flexible generation of deterministic twoqubit operator measurements and has links to the important concepts of mode-entanglement and repeat-untilsuccess protocols. Importantly, unlike flying qubit protocols, our bus particle never contains information about the individual quantum states of the particles, hence is information-free.

Photonic module: An on-demand resource for photonic entanglement

“…al. [47] falls slightly short of being able to perform two-photon parity measurements (which are sufficient to prepare Bell states, GHZ states and linear cluster states [17]). The micro-cavity of Trupke et.…”

“…Multi-partite entanglement can be prepared in systems such as trapped ions [8] and solid state qubits [9,10,11,12,13,14], but as resources for quantum cryptography and communications they are problematic due to a high sensitivity to environmental decoherence, qubit immobility and the inevitable incorporation of quantum bus protocols [15,16,17] and/or fusion methods [18,19,20,21] to solve problems related to information transport. In contrast, photonic qubits are extremely easy to move and are robust against decoherence.…”

Branching spin chain dynamics

“…In this case the entanglement could then be trapped in the two qubits by a single qubit operation applied to one of them. This system could also be used as a switch, for example to start a computation, or to initialize from a distance the creation of entangled states needed for measurement-based computation [22]. The middle panel of Fig.…”

“…Spatially separated entanglement is a useful and flexible resource [16,[18][19][20][21][22][23][24] for quantum information. It is an essential ingredient for quantum teleportation [25], which enables the transfer of an unknown quantum state.…”

Coherent Tunneling Adiabatic Passage with the alternating coupling scheme

“…Recently Longhi et al [16,17,18] demonstrated CTAP of photons in a three-waveguide structure adding significant motivation to demonstrations with massive particles. CTAP has also been proposed as a means of implementing a quantum analogue to fanout using MRAP (MultiRecipient Adiabatic Passage) [19,20] and operator measurements. Other recent works have investigated the differences in CTAP in quantum optics and solid state systems [21,22].…”